One of the most common questions people ask when considering solar is surprisingly simple:
“Will solar actually work on my home?”
Before assessing suitability, it can also help to understand the basics of how solar power systems work in New Zealand.
The good news is that many New Zealand homes can support solar panels. However, every property is different. Factors such as your roof, surrounding environment, electricity usage, and future plans can all influence whether solar is a good fit.
Before diving into quotes, system sizes, or battery options, it helps to understand the key factors that affect solar suitability.
A home may be suitable for solar if it has enough usable roof space, reasonable sun exposure, limited shading, and electricity usage that makes solar worth exploring. Roof direction, roof condition, energy habits, and future plans such as EV charging or battery storage can all influence suitability.
Your home may be worth assessing for solar if:
When most people think about solar, they immediately think about the roof, and for good reason.
Your roof is where solar panels will usually be installed, so its size, shape and condition can influence the available options.
A large, unobstructed roof area generally provides more flexibility than a roof with multiple angles, dormers, skylights or other features competing for space.
That does not mean a complex roof rules out solar. Many systems are installed on homes with challenging roof layouts. It simply means the design process may require a little more consideration.
If your roof is nearing the end of its lifespan, it may also be worth discussing future roofing plans before installing any solar equipment.
Roof orientation is another factor that often comes up during conversations about solar.
In New Zealand, north-facing roof areas typically receive the most sunlight throughout the year. East and west-facing roofs can also be suitable, depending on the property and how electricity is used throughout the day.
Many homeowners assume that if their roof is not perfectly north-facing, solar is not worth considering.
That is rarely the case.
Modern solar system design takes many variables into account, and orientation is only one part of the picture.
The inverter selected for a system can also play an important role in how a system performs across different roof layouts and conditions.
Shading is one of the easiest factors to overlook.
A roof may look ideal at first glance, but nearby trees, neighbouring buildings, chimneys or other structures can affect how much sunlight reaches the panels during different times of the day.
The impact of shading varies from property to property.
A small amount of occasional shading may have little impact, while significant shading throughout the day could influence system design decisions.
If you are unsure, taking note of how sunlight moves across your roof throughout the day can be a useful starting point.
Solar is not only about the roof.
Your household’s electricity usage is equally important.
Two homes with identical roofs may have very different energy needs.
A household that uses relatively little electricity may have different goals from one with electric heating, a spa pool, a large family or an electric vehicle.
Looking at your recent power bills can help you understand:
Understanding your energy use helps create a clearer picture of your situation before exploring potential solutions.
Your current electricity usage only tells part of the story.
Many households are changing how they use energy.
Maybe someone is starting to work from home full-time. You may be considering a pool, spa, extension, or additional heating. Perhaps you are planning to purchase an electric vehicle. Future electricity demand often changes when households add technologies such as electric vehicles.
These changes can influence future energy requirements.
Thinking ahead often provides a more complete picture than looking only at today’s electricity use.
Not every solar system includes batteries, but it is worth considering your future plans.
Some homeowners are primarily interested in reducing reliance on grid electricity during daylight hours.
Others are interested in battery storage, backup power, or increasing energy independence.
Understanding your goals early can help shape future discussions and ensure any recommendations align with your priorities. If battery storage is part of your future plans, it can be useful to understand how modern lithium battery systems work and where they fit within a solar setup. Check out this piece we put together recently on BYD batteries
New Zealand receives varying levels of sunlight depending on location, season and weather patterns.
One of the most common myths about solar is that it only works in the sunniest parts of the country.
In reality, solar systems are installed throughout New Zealand, from the Far North through to the lower South Island.
Every property is unique, which is why a site-specific assessment is usually more valuable than broad assumptions based solely on location.
People often assume their property is unsuitable for solar because of one factor.
Perhaps the roof is not north-facing. Maybe there is some shading. Or perhaps the home experiences cloudy weather.
The reality is usually more nuanced.
Solar suitability is rarely determined by a single factor. It is the combination of roof characteristics, shading, energy use, goals and site conditions that creates the full picture.
That is why it is difficult to determine suitability based on a single photograph or a quick glance at a roof.
There is no single checklist that determines whether a home is suitable for solar.
The answer depends on a combination of factors including roof characteristics, shading, electricity usage, future plans and personal goals.
The encouraging news is that many homes are suitable for solar in some form.
The best place to start is by understanding your property, reviewing your energy usage, and gathering information. Even a basic understanding of these factors can help you have more informed conversations and make better decisions about your home’s energy future.
To understand whether solar could suit your property, Current Generation can assess your roof, usage patterns and energy goals before recommending next steps.
If you’re still in the research phase, learning more about solar system components, batteries, and inverters can help you better understand the options available.
No. North-facing roofs often receive the most sunlight throughout the year, but east and west-facing roofs can also be suitable depending on the property and household energy patterns.
It may be possible, depending on the amount and timing of the shading. Every site is different and should be assessed individually.
Is an older home suitable for solar?
Many older homes can support solar installations. Factors such as roof condition and electrical infrastructure may need to be considered as part of the planning process.
Many homeowners consider future electricity needs when exploring solar. Planning ahead can help ensure future requirements are taken into account.
Posted in Miscellaneous
As electric vehicles become more common, charging has started to become part of a wider conversation around energy use at home. For households with solar, battery storage, or plans to reduce reliance on the grid, charging a vehicle is no longer just about plugging in and topping up.
This is where Victron takes a slightly different approach.
Rather than treating EV charging as a standalone product, Victron sees it as one part of a broader energy system. For homes already using solar, batteries, or backup power, this can create opportunities to better manage where energy comes from and how it is used.
Victron Energy is a Dutch company with a long history in off-grid power, battery systems, inverters, and energy management. Its products are commonly used in rural homes, marine systems, farms, and remote installations where reliability matters.
That background shapes how Victron approaches EV charging.
While many EV chargers focus mainly on charging speed and convenience, Victron’s products are designed to work alongside solar systems, batteries, and broader site energy management.
For many homes, an EV quickly becomes one of the largest users of electricity.
Charging a vehicle overnight can significantly increase household energy demand, and for properties with solar systems there can be a big difference between charging at the right time and simply charging whenever the vehicle is plugged in.
This is one of the areas where smarter charging systems can become useful. Rather than acting independently, some systems can respond to available solar generation, battery storage, and household energy use.
Victron chargers are designed to work within a connected energy system.
In a properly configured setup, charging behaviour can respond to wider conditions across the property. For example, charging rates may adjust depending on solar generation or changes in household energy demand.
This does not necessarily mean a vehicle runs entirely on excess solar power. Real-world charging demand often exceeds available solar generation. However, integrating charging into the wider energy setup can help improve self-consumption and reduce unnecessary grid use.
This approach is often most relevant for homes with:
One of the themes that regularly appears in installer feedback is that Victron focuses heavily on control and flexibility.
For example, owners can use Victron VRM (Victron Remote Management) to view charging activity alongside solar production, battery performance, and overall energy use.
For some homeowners this level of visibility can be useful, particularly for remote properties or sites with more complex energy requirements.
Others may never need this level of detail.
Victron chargers are generally aimed at users already thinking about energy management as a whole rather than simply wanting a charger for their vehicle.
That flexibility does come with some trade-offs. Installation and configuration can be more involved than some consumer-focused chargers, and the greatest benefits are often seen when paired with other Victron equipment.
For homes wanting a simple plug-in charger with minimal setup, there may be simpler alternatives available.
Victron EV chargers are unlikely to be the right fit for every property.
Their strengths are less about charging speed or visual design and more about how charging fits into the wider energy picture.
For homes already using solar, batteries, or backup systems, that approach may offer greater flexibility and control over time.
If you are thinking about solar, it’s easy to jump straight to questions like How many panels do I need? or How much could I save? But before getting that far, there is a more useful place to start: understanding how much electricity your household actually uses.
Many people are surprised by what they find. Some homes use less electricity than expected, while others discover that a few appliances or habits are driving a large share of their power use.
The good news is you do not need spreadsheets, technical knowledge or specialised software. In most cases, your power bills already tell you a lot.
One of the biggest assumptions people make is that two households of similar size will use electricity in the same way. In reality, usage can look completely different.
A family of five might use less electricity than a couple working from home. A home with electric hot water, underfloor heating or a spa pool will often look very different from one using gas or wood heating.
It is not only about how much electricity you use either. When you use it can matter too.
Some households use most of their electricity during the day. Others see their highest usage in the evenings when everyone gets home, turns on heating, cooks dinner and starts charging devices.
Getting a clearer picture of your usage patterns gives you a better understanding of how your home operates before exploring any future energy options.
The simplest place to begin is your electricity bill.
Most bills already include the information you need. Somewhere on the statement you will usually find your total electricity use measured in kilowatt-hours (kWh).
If that term sounds technical, it is not as complicated as it appears.
A kilowatt-hour is simply a way of measuring electricity over time. Think of it as the unit used to track how much power your household consumes.
Rather than worrying too much about the technical definition, focus on the number itself.
Take a look at a few recent bills and see whether usage changes month to month.
Winter often tells a different story from summer.
Heating systems, shorter daylight hours and spending more time indoors can push household electricity use much higher during colder months. Some homes also see seasonal spikes from irrigation systems, pools or changes in daily routines.
Looking at one month in isolation can sometimes give a misleading picture. If possible, reviewing six to twelve months of history gives a much better understanding of your overall energy use.
Once you have a bill in front of you, there is a simple way to estimate your typical daily use.
Take the total kWh on your bill and divide it by the number of days in the billing period.
For example, if your statement shows: 1,200 kWh used over 60 days
Your average would be: 20 kWh per day (1,200 / 60)
You do not need exact precision here. The goal is simply to establish a baseline and understand whether your home uses relatively low, moderate or high amounts of electricity.
People often assume televisions, phone chargers and lights are responsible for huge power bills.
Usually, the bigger contributors are less obvious.
Hot water systems often account for a significant share of household electricity use. Heating can also become a major factor during winter, particularly in larger homes or properties using electric heating systems.
Then there are the additions people sometimes forget about entirely. Spa pools, pumps, home workshops, electric vehicle charging, extra fridges in garages, and heated towel rails can quietly add up over time.
The goal is not to audit every appliance in your home. It is simply about identifying anything that might explain unusually high or changing electricity use.
Power bills show the total picture, but many electricity retailers now provide apps or online dashboards that break usage down further.
These can sometimes reveal patterns that are difficult to spot from monthly bills alone.
You might discover that electricity use spikes every evening at the same time. Or perhaps your home has a surprisingly steady level of daytime usage.
For households where people work from home, have young families, or spend long periods at home during the day, these patterns can look very different.
Understanding your routine often provides useful context.
Your current electricity use only tells part of the story.
Many households are not standing still.
Perhaps an electric vehicle is on the horizon. Maybe someone is beginning to work from home full time. Renovations, a growing family or installing a spa pool can all change electricity use over time.
Future changes are worth considering because your household in two years may look different from your household today.
Most people do not need highly detailed calculations, but there are a few traps worth avoiding.
The first is relying on a single power bill. One month rarely tells the whole story.
The second is overlooking seasonal changes. Winter and summer can look very different.
The third is guessing. Many homes already have enough information available without making assumptions.
The aim is not perfect forecasting. It is simply building a clearer understanding of how your household uses electricity today.
Once you know your average daily electricity use, you begin to build a clearer picture of how your home operates.
For example, a household using 10 kWh per day may have very different needs from one using 40 kWh per day. A home with relatively low electricity use may approach energy planning differently from a larger household with electric heating, a spa pool or an electric vehicle.
But total usage is only one piece of the puzzle.
The bigger question is often when electricity is being used.
If most of your power use happens during the day, your energy patterns may look very different from a household where usage peaks in the evenings after everyone gets home.
Understanding these patterns creates a more informed starting point and can help guide future conversations.
Looking at electricity usage can also uncover habits that often go unnoticed.
You might discover:
These insights are useful even outside of solar discussions because they help explain where energy is being used around the home.
People often begin by asking:
“How many panels do I need?”
In reality, that question usually comes later.
Understanding your electricity use is more like gathering the information that helps create a clearer picture of your household before exploring options.
You do not need perfect numbers. You simply want a practical understanding of how your home uses energy.
Before thinking about panels, batteries or system sizes, understanding your own electricity use is one of the most practical places to start.
A few minutes looking through old power bills can often reveal more than people expect.
You do not need perfect data or complex calculations. The goal is simply to understand your household a little better and build a clearer picture of how energy fits into everyday life.
Electricity use varies widely depending on the number of people in the home, heating systems, appliances and lifestyle. Looking at your own usage history is usually far more useful than comparing yourself to averages.
Not necessarily. Total usage is only one part of the picture. Usage patterns and timing can also influence decisions.
Not always, but a longer history can make seasonal patterns easier to understand.
Adding a battery to a solar system lets you use more of your own power and gives you some protection during outages. BYD batteries are widely reviewed across Australia, Europe, and New Zealand, and have built a solid reputation for reliability, safety, and long service life.
BYD (Build Your Dreams) is a global clean-energy leader founded in 1995 and headquartered in Shenzhen, China. Known for innovation in electric vehicles, energy storage, and solar technology, BYD manufactures everything in-house — from battery cells to final systems — ensuring total quality control. It has now grown to an international group with 180,000 employees.
The BYD Battery-Box range uses Lithium Iron Phosphate (LFP) chemistry, which is commonly recognised for its stability, safety, and long cycle life. Because of this, many reviewers and installers consider BYD to be a solid option for residential and commercial (as well as agricultural) storage.
A point raised often in independent reviews is that BYD makes its own cells and assembles its own battery modules rather than outsourcing. This approach gives more control over quality and consistency.
The process includes:
These steps are often highlighted in third-party reviews because they contribute to the Battery-Box reputation for consistency and safety. BYD has shared footage of its production lines, which provides insight into how these units are built.
The BYD Battery-Box is a modular lithium iron phosphate energy-storage system that can be used to store excess solar power for later use, or other situations where the functionality provided by battery storage is required. Each “box” contains stackable battery modules with a built-in Battery Management System (BMS), allowing capacity to grow as your energy needs increase. BYD’s design is fully scalable — from a few kilowatt-hours for a home to nearly a megawatt for commercial and agricultural operations.
Current Generation installs the following BYD models:
These units work with inverter brands such as Fronius and Victron, which Current Generation also supplies.
The LVL is BYD’s larger 48V option. Reviewers usually highlight its size, weight, and capacity, noting that it suits commercial or high-demand sites rather than smaller homes.
BYD LVL
The LVS is widely regarded as the most flexible model. It is commonly listed on “recommended battery” lists because it is simple to install and easy to expand in 4 kWh steps.
BYD LVS
The HVS and HVM are high-voltage versions designed for hybrid systems. Review sites often discuss these in relation to the Fronius GEN24 inverter, as the combination is common and well supported.
BYD HVS
BYD HVM
Choosing the right model depends on load size, inverter type, and how much storage is needed.
For larger systems or sites with unusual loads, getting the system designed is recommended.
One thing reviewers often highlight is the strong integration between BYD’s high-voltage batteries and the Fronius GEN24 inverter range. This pairing is DC-coupled, which means power goes straight from panels to the battery without extra conversions. This usually improves efficiency and reduces energy losses.
AC-coupled batteries (such as Tesla Powerwall or GivEnergy) work well too, but do involve more conversion steps.
BYD batteries have built a reputation for reliability, strong safety performance, and flexible system design. They suit a wide variety of homes, farms, and commercial sites, and work well with modern hybrid inverters such as Fronius GEN24.
If you’re considering battery storage or upgrading an existing setup, the Current Generation team can provide system design and installation across the South Island.
Or, talk to our team about the right BYD system for your property.
Major power cuts can arrive suddenly, particularly following storms, earthquakes, infrastructure failures, even the inadvertent removal of a few too many bolts in a critical pylon. When the lights go out, businesses face immediate disruption: production lines halt, cooling systems shut down, tills go dark, and, critically, your ability to communicate with and update your customers and suppliers and access your data can all but disappear.
Here are some practical ways you can keep your business’s critical functions running when the grid goes down.
For most businesses, power is something that’s easy to take for granted—until it isn’t there. An unexpected outage doesn’t just mean lost time; it can lead to costly spoilage, unfulfilled orders, and, ultimately, disappointed customers. Backup power systems ensure that even when the grid fails, your critical operations continue without missing a beat.
Battery backup systems are becoming more popular because they’re effective, quiet, and can also provide other financial benefits when the grid is up, particularly if coupled with solar. Unlike generators, they don’t rely on fuel, making them clean and quiet to run. Here’s why batteries might work well for your business:
The best way to determine if a battery system is right for you is to look at your business’s energy needs. A backup battery can be sized to support critical systems although if you have very high-power needs in an outage, a generator is likely to be required to supplement the battery. Battery is often coupled with solar as this gives you free charging and allows you to reap other financial benefits of having power storage onsite.
While battery systems are a great fit for certain needs, generators offer reliable, heavy-duty power and are often a good choice for businesses that need to keep heavier equipment running. Diesel generators are particularly popular because they’re robust, fuel-efficient, and dependable during long outages.
Putting backup power in place doesn’t have to be complicated, and it can make all the difference when it matters most. Here’s what you need to know about getting started:
Nobody likes to imagine worst-case scenarios, but having a solid plan in place provides peace of mind. A dependable backup power solution is an investment in your business’s resilience, helping you weather power cuts and keep serving your community. Whether you’re leaning toward a quiet battery system or a traditional generator, taking steps now ensures your business stays prepared, come what may.
A grid-tie solar system is an alternative power system designed for homes and commercial buildings that are connected to the electricity grid. It allows you to produce your own power, thereby reducing your electricity bill by needing to import less power from the electricity grid. Any excess power is fed back into the electricity grid with the system switching seamlessly between exporting and importing power to and from the grid depending on what is needed.
Grid-tie solar systems are a popular and efficient solution for homeowners in New Zealand looking to harness the power of the sun and reduce their reliance on traditional energy sources. In the following article, we will dive into the details to help you understand the workings of grid-tie solar systems, their benefits, and what you need to know before installing this type of solar system in your home.
A grid-tie solar system, also known as an on-grid or grid-connected solar system, is a type of photovoltaic solar setup that is directly connected to the electricity grid. The key components of a grid-tie solar system include:
When sunlight hits the solar panels, they generate DC electricity. This is transmitted to the inverter which converts this DC electricity into AC electricity. The AC electricity is then fed into your home’s switchboard. Any excess electricity generated by your solar system is sent back to the electricity grid with the electricity meter measuring it so it can be credited against your power bill.
During times when your solar system is not producing enough electricity to meet your household’s needs, such as at night or on cloudy days, your home automatically draws electricity from the electricity grid to make up the difference.
Grid-tie solar systems offer numerous advantages for New Zealand homeowners:
Installing a grid-tie solar system involves several steps:
Once installed, grid-tie solar systems require minimal maintenance. It is recommended that you clean the solar panels annually.
Many New Zealand homeowners have already made the switch to grid-tie solar and are reaping the benefits. For example, a family of four in Nelson installed a 6kW grid-tie solar system on their home in January 2025. While they also have a solar hot water system, they have seen their energy bills decrease markedly. They are currently expecting to have power bills which average just $13 per month over the first year based on performance to date. They also enjoy the peace of mind knowing that they are contributing to a cleaner, more sustainable future for their children.
Another Tahunanui family with a 5kW grid-tie solar system have seen 53% of the output of the system self-consumed through their own usage. This has equated to 48% of their total power usage while still exporting 3,900kWh to the grid for a credit over the last 12 months.
The size of the grid-connected solar system you install is only constrained by your budget and the space available for mounting panels, whether that be on your roof or a ‘ground mount’. In saying that, there will be an optimum size of system depending on how much power you use and when.
Systems are often talked about as being XkW in size. This can refer to one of two things; the ‘peak’ output of the solar panels installed (denoted kWp) or the power rating of your inverter (generally measured in kW). Most systems are designed to have more potential peak solar output from the panels than inverter capacity (e.g. a system could have 12kWp of PV solar panels with a 10kW inverter). This is usually the most efficient and effective arrangement when considered from a return on investment as while some of the panels generating potential could be ‘clipped’ by the inverter in the middle of a summer’s day, the majority of the time the panels will be producing below peak and having higher overall generation in the darker months of the year and either end of the day results in better overall performance.
Typically, homeowners will install a system with an initial capacity of between 5kW and 15kW. Small businesses might be looking at 10 to 25kW. For larger commercial or industrial property owners, bigger systems that could be anything up to 1 MW could be the best fit. System can be single, two or three-phase, with the number of phases usually set by the number of supply phases to the property.
Often, owners choose to install a larger system as they are believe there is a likelihood of their power needs increasing in the near future (heat pumps, EVs, pool or spas being the usual suspects). Looking for an inverter that has ‘hybrid’ capability, the ability to integrate battery at a later date, is also high on the list for most people. The cost of the system is dependent on system generating capacity and ease of installation.
At Current Generation we are a one-stop shop, supplying a complete range of quality components, consulting with you, designing, and installing your grid-tie system. We will also liaise with the network company and electricity retailer. This makes the whole process easier for you. Ask us about designing and installing your system today!
Grid-tie solar systems offer a compelling solution for New Zealand homeowners looking for a great return on a financial investment, to minimise their environmental impact, and to increase the value of their homes. By understanding how these systems work, their benefits, and the installation process, you can make an informed decision about whether a grid-tie solar system is right for you.
To learn more about grid-tie solar systems and how they can benefit your home, come and talk to us at Current Generation for a consultation and personalised assessment of a solution that fits your situation.
At Current Generation, our approach is to empower you with the knowledge to make informed decisions about solar energy. As solar photovoltaic (PV) technology becomes more affordable and accessible, understanding the financial aspects—including buy-back rates—is crucial for anyone considering solar installations in 2025.
Buy-back rates (sometimes called export rates) are the prices electricity retailers pay for the excess electricity your solar PV system generates and feeds back into the grid. Feed-in tariffs (FITs) are similar but are often set by government policy to encourage renewable energy by guaranteeing a fixed, attractive price for exported electricity over a certain period.
In New Zealand, there isn’t a government-mandated feed-in tariff scheme for solar power. Instead, electricity retailers set their own buy-back rates, which are generally lower than the retail rates consumers pay for electricity.
Here is an overview of the buy-back rates offered as of June 2025 by some major electricity retailers (source: www.powerswitch.org.nz/solar-rates):
Please note that these rates can change, so we recommend checking with the retailers directly for the most current information.
The difference between the higher retail electricity prices (approximately 30 cents per kWh) and the lower buy-back rates means that the financial return on your solar PV system will be impacted by how much of the generated electricity you can use yourself.
For example, a 3 kW solar PV system might produce around 4,500 kWh annually. If you consume 70% of this energy, you avoid purchasing 3,150 kWh from the grid, saving about $945 per year. The remaining 1,350 kWh exported to the grid would earn you approximately $169 if your buy-back rate is 12.5 cents per kWh. This results in a total annual benefit of around $1,114.
The Energy Competition Task Force (jointly established by the Electricity Authority and the Commerce Commission) is investigating ways to improve the performance of the New Zealand electricity market.
This is relevant to people with solar and battery energy storage systems (BESS) as they have specifically been looking at, and consulting on, ways to encourage more ‘fairness’ for those consumers who are helping to ease the strain on the infrastructure and the market as a whole.
At present, two specific initiatives are being looked which directly support solar and BESS
There is no doubt in our mind that a more distributed power generation and storage market, predominantly underpinned by the adoption of solar and BESS by consumers (both residential and commercial), is critical to helping to solve the near-to-medium term challenges in New Zealand; namely its lack of security around its centralised generation capacity and transmission network.
Our reliance on hydroelectric power makes us vulnerable to dry years and changing climate patterns. Distributed solar generation can help mitigate these risks and contribute to energy security. It also helps reduce the need to fire up the hugely polluting coal power stations such as Huntly which currently act as the backstop to our power needs.
While there are challenges, the future of solar energy in New Zealand is promising:
At Current Generation, we’re committed to helping you navigate the solar energy landscape. Investing in a solar PV system can be financially beneficial, especially when you maximise your self-consumption. By making informed decisions, you can contribute to New Zealand’s renewable energy goals and enjoy personal financial rewards.
By taking these steps, you not only enhance the return on your investment but also play a part in creating a sustainable, secure energy future for all of New Zealand.
Have you noticed more solar panels popping up on roofs around Nelson? Maybe you’ve been considering them yourself. But there’s often a question that comes up: “What about when the sun’s not shining?”
It’s a fair point. After all, we still need power at night and on cloudy days. That’s where battery backup systems come in, and they’re becoming an increasingly common sight in homes across New Zealand.
We’ve been installing solar systems since 2006, and we’ve seen a lot of changes in that time. One of the biggest has been in battery technology. These systems used to be bulky, expensive, and a bit of a hassle. But that’s not the case anymore.
If you’re curious about how modern battery systems might fit into your home or business, you’ve come to the right place. We’ll walk you through the basics, explain who can benefit, and give you the information you need to decide if it’s right for you. No fuss, no exaggeration – just straight talk about powering your property.
A battery backup system is a smart addition to your grid-tie solar setup. It’s like having a big rechargeable battery for your whole property. During the day, when your solar panels are working hard, this system stores up extra energy. Then, when the sun goes down, it releases that stored power, keeping your lights on and your fridge running.
Here’s why our customers love their battery backups:
Now, you might think these systems are just for folks with solar panels, but that’s not the case. We’ve installed them for:
Whether you’re in sunny Nelson, coastal Marlborough, or tucked away in Golden Bay, a battery backup can make a real difference.
Choosing the right size isn’t too tricky, but there are a few things to consider:
A well-designed system won’t drain your batteries too much, which means they’ll last longer. Pop in for a chat, and we’ll help you figure out what’s best for your place.
Battery technology has come a long way in recent years, and we’ve kept pace with these changes. At Current Generation, we’re always looking for the best solutions for our customers across the Top of the South.
Lithium batteries: The new standard
Lead-acid batteries: Still an option
Why we choose BYD batteries We’ve done our homework, and that’s why we exclusively stock BYD batteries. You might know BYD as the world’s largest EV maker, but their energy storage solutions are top-notch too.
Here’s why we trust BYD:
Absolutely. The systems we install have some nifty monitoring tools:
Whether you’re at home in Nelson or Blenheim, or away in the Marlborough Sounds, you’ll always know how your system’s performing.
Good question. Batteries have some advantages over generators:
Let me show you some data from a system we installed in Richmond:
Here are some screenshots of the monitoring from a GTBB (Grid Tie Battery Back-up):
Battery SOC (State of Charge): The batteries were fully charged about lunchtime and were discharged by about 20% overnight.
Battery Performance: The battery voltage (blue) climbed during the morning (the dips are when the sun is behind a cloud, or when a large load is drawn). During the afternoon it stayed steady (float charge). At sunset, the bank is no longer being charged and the battery bank’s voltage drops and goes down slowly overnight. The ‘blips’ overnight will be the fridge compressor turning on and off.
Consumption: During the day, the house is running mainly from solar with minimal draw from the batteries or grid. Only ¼ of a kWh was taken from the grid for the whole 24 hour period ($0.07 worth).
Solar Yield: This shows how energy is sent to the batteries until they’re full and then exported to the grid after that. During the winter months, there would be far less energy exported. Ideally, the grid is only really used for back-up and most of the energy used is produced on-site.
Live Feed: This is the live feed from the same system the following morning. The energy being yielded is not being exported to the grid – it gets sent straight to the batteries and the home until the batteries are full. When this snapshot was taken, 223W was being sent to the batteries.
With these advancements in battery technology, there’s never been a better time to consider adding storage to your solar setup. Here’s why our customers across the Top of the South are making the switch:
Look, we know it’s an investment. But with battery prices coming down and technology improving, many of our customers find it’s worth every penny.
We’ve been in this game since 2006, and we’ve seen the industry grow and change. Our focus has always been on providing top-notch solutions for the Top of the South Te Tau Ihu region – from the West Coast to Golden Bay, Nelson to the Marlborough Sounds, and over to sunny Blenheim. But we’ve got experience all over New Zealand too.
We’re not just about selling you a system – we’re about finding the right solution for your needs. Our designs are customised to your site, maximising your resources and giving you the best value for money (which isn’t always the cheapest option!). We make sure it works first time and looks great to boot.
If you’re curious about how these new batteries might work for your place, why not give us a call or stop by our shop? We’ve been helping folks around the Top of the South with their power needs for years now, and we’d be happy to share our local knowledge and experience with you.
Always straight talking, we’ll give you the facts, tools and support to understand the solutions we think are appropriate for you, allowing you to make an informed decision about how you power your future!
Original article:
During the day, the house is running mainly from solar with minimal draw from the batteries or grid. Only ¼ of a kWh was taken from the grid for the whole 24 hour period ($0.07 worth).
This is the live feed from the same system the following morning. The energy being yielded is not being exported to the grid – it gets sent straight to the batteries and the home until the batteries are full. When this snapshot was taken, 223W was being sent to the batteries.
So, the system works very well and adds multiple layers of functionality to a grid-tie system. As very few units are being imported (bought from the retailer), the money saved offsets the cost of the batteries over time. In the event of a power cut, the system remains active. It might be necessary (depending on the power use at your property) to have certain circuits switch off during a power cut to prevent over-discharge of the batteries, but this is fairly easy to automate. It can also be done manually of course. A generator can also be added if you need to be able to run large loads during extended power cuts. The battery bank needs to be sized based on one’s consumption and PV yield. If a battery bank that is too small is used, the voltage will drop too much when large loads turn on, causing importing of energy from the grid. This can also shorten the battery life. Furthermore, if a large load is switched off while in ‘off-grid mode’, a sudden in-rush of current from the PV to the batteries can happen, which is not ideal. A large battery bank is better for the batteries, but a balance needs to be struck between the service life of the batteries, their performance, and the capital investment.
In my opinion, a battery back-up system is the best way to add value to a grid-tie solar system. It will cost more up-front, but this will even out over time, all the while giving you added functionality.
Solar energy is a renewable power source that harnesses the sun’s radiation (often called irradiance) and converts it into usable electricity. In recent years, solar technology has become increasingly popular and viable in New Zealand, thanks to improving technology and falling costs. This clean energy solution is helping Kiwis reduce their power bills while contributing to a greener future.
New Zealand is blessed with ample sunshine, making it an ideal location for solar energy generation. While Nelson boasts the highest average sunshine hours nationally (around 2,400 annually), many other regions are not far behind. Marlborough, Canterbury, Otago, and most of the North Island also bask in high levels of sunshine. Even areas with less direct sunlight can still benefit significantly from solar installations as modern panels efficiently capture the available irradiance across a wide range of light conditions.
Solar PV systems are at the heart of the renewable technology revolution. These clever systems use solar cells to directly convert sunlight into electricity through a process known as the photovoltaic effect. The term “photovoltaic” itself combines “photo” (light) and “volt” (electricity), perfectly describing how these systems operate.
A solar panel has silicon semiconductor layers that absorb solar radiation. When sunlight hits these layers, an electric current is generated that can be harnessed for power. It’s a simple yet ingenious process that’s helping to reshape New Zealand’s energy landscape.
Embracing solar energy offers a multitude of benefits for Kiwi homes and businesses.
Nowadays the number one reason we see people moving to solar is financial. Gone are the days where solar was solely the domain of those prepared to (at least partially) ignore the economics for the sustainability benefits and/or the opportunity to use cutting edge technology to power their house. Now for most it is all about the 10-15% return on investment (6-9 year payoff) we are typically seeing for new grid tie systems; and this return will rise if power costs rise more quickly than the model predicts (we use 3% pa) or you can make changes to your power usage patterns to maximise the use of solar.
In addition, solar power is clean and renewable, producing no emissions during operation, thereby helping to reduce your carbon footprint.
Solar, particularly when coupled with a battery, also offers a degree of energy independence, reducing reliance on the grid and power companies. This can be particularly appealing in remote areas or for those looking to have more control over their energy supply.
From a practical standpoint, solar PV systems are remarkably low maintenance. With no moving parts, they require minimal upkeep, making them a relatively hassle-free addition to your property. We typically recommend you clean your panels every 12-18 months but that is it. Moreover, quality solar panels have a long lifespan with an expected lifetime of 30 years or more, providing excellent value for money.
An often-overlooked advantage is the potential increase in property value. As more Kiwis recognise the benefits of solar, homes equipped with these systems are becoming increasingly attractive to buyers.
When considering solar power for your property, you’ll encounter three main types of systems: off-grid, grid-tie (or grid-connected) and hybrid systems.
The financial aspect of going solar has become increasingly attractive in recent years. The cost of solar PV systems has decreased significantly, making them more accessible to a wider range of Kiwi households and businesses. Adding to the financial argument for solar, the price of power has been increasing meaning that each unit of power you produce on your roof is worth more to you. The combination of these factors now mean that many residential systems are projected to provide returns of 10-15%, equating to payoff periods of 6-9 years. Commercial systems can see much higher returns, up to 30% pa, due to the very high alignment between the timing of the power consumption by the business and the generation of power from the solar on the roof.
Residential systems typically range from $8,000 to $22,000 NZD, depending on size and complexity. Commercial systems, which can range from 10kW to 1MW, vary based on the project scope. While these figures might seem substantial, it’s important to consider the long-term savings and benefits.
Given that quality systems can last 30 years or more, this represents a significant period of ‘free’ electricity once the initial investment is recouped (although it would be prudent to factor in a change of inverter in that time period).
The outlook for solar energy in New Zealand is bright. Experts predict that solar PV could make up 6% of New Zealand’s electricity supply by 2035, marking a significant increase from current levels. This growth is expected to be supported by continued technological improvements, which should further reduce costs and increase efficiency.
The integration of solar power with other technologies, such as battery storage and electric vehicles, is set to enhance its value proposition even further. As grid electricity prices continue to rise and solar costs decline, the economic case for solar power in New Zealand is only getting stronger.
For Kiwis looking to reduce their carbon footprint, gain more control over their energy costs, and invest in a sustainable future, solar energy presents an exciting opportunity. As technology advances and adoption increases, solar power is poised to play an increasingly important role in New Zealand’s energy landscape.
Solar energy is a renewable power source that’s becoming increasingly popular among New Zealand homeowners. By harnessing the sun’s energy, you can reduce your electricity bills and lower your carbon footprint. However, the world of solar energy comes with its own set of terms and concepts that might seem daunting at first. This guide aims to demystify some of the most common solar terminology, helping you make informed decisions about adopting solar power for your home.
The conversion of sunlight directly into electricity using semiconducting material. Solar panels use the photovoltaic process to generate power.
A panel designed to absorb the sun’s rays and convert that into a useful source of energy, generally either electricity or heating; PV, or photovoltaic, solar is often used to refer to a system where the panels produce electricity.
A device that converts the direct current (DC) electricity produced by solar panels or discharged from batteries into alternating current (AC) electricity used in homes. Some inverters can also convert AC to DC to allow the charging of batteries from an AC source such as a generator or the grid, these are called inverter chargers.
A flow of electrical energy (technically usually electrons). Electrons need a conducting material or space through which to travel.
A device through which electrical current can move freely only in one direction.
A subatomic particle having a negative charge.
A crystalline substance having electrical conductivity somewhere between a conductor and an insulator. Silicon is a commonly used semiconductor in solar cells.
A non-metallic element often used as a semiconductor in solar cells.
A grid-tied solar system is connected to the local electricity grid. It allows you to draw power from the grid when needed and (usually) feed excess power back into it.
Off-grid, or grid-free solar is a standalone system not connected to the electricity grid. It requires battery storage to provide power when the sun isn’t shining and usually has a ‘back-up’ power source, such as a generator.
A grid-tied system that incorporates energy storage system (99% of the time, a battery) allowing the use of PV solar generated power when the sun isn’t shining and also provides back-up power during a grid outage, offering greater independence and energy security.
A collection of multiple solar panels working together to generate electricity.
A device that stores excess energy produced by your solar panels for use when the sun isn’t shining or during power outages. Batteries come with different ‘chemistries’. You’ll often hear about the likes of lead acid, lead carbon or deep cycle batteries (a particular lead acid battery construction). Now, lithium-ion batteries are generally considered the best solution for home or commercial battery storage with the two common chemistries being lithium iron phosphate (LiFePO4) and lithium nickel manganese cobalt oxide (LiNiMnCoO2 or NMC).
A device that optimises the output of the solar panels using a maximum power point tracker (MPPT) to vary the voltage and current from the panels to optimise the output of the panels. The solar charge controller then regulates the voltage and current going to the battery (or inverter), preventing overcharging and protecting the battery from damage.
Solar panels consist of a group of PV cells electrically connected and packaged in one frame.
Solar power is used to refer to the process of harnessing usable energy from the sun such that it can be used to as a utility. Solar panels are made up of photovoltaic (PV) cells, typically composed of silicon. When sunlight hits the silicon, it causes electrons to break free from their orbit around the nuclei of the silicon atoms. This creates a flow of electrons, or an electrical current.
The electric field surrounding the solar cells acts as a diode, allowing electrons to flow in a certain direction. By using metal contacts on the top and bottom of the cells, it is directed that current for use outside of the panel.
A solar power system often requires an energy storage unit called a battery to use the energy obtained throughout the day. The charge controller ensures that the batteries are not overcharged during the day or drained too much at night. To protect the battery from damage, the controller will not allow more current to be drained once the battery has been depleted to a certain level.
A kilo is “one thousand”, as in kilometre.
A measure of power equal to a Joule (J) per second (s) (1W = 1J/s). A Joule is a measure of energy, defined by James Prescott Joule as the energy used to accelerate a body with a mass of one kilogram using one newton of force over a distance of one meter.
The measure of time you know well.
So kW is 1000 Watts, a measure of power.
The size of a solar system is defined by its peak power, often denoted as kWp (the p standing for ‘peak’), e.g. a 1 kWp system can produce 1 kW of power per hour when operating in line with the ‘standard test conditions’.
kWh stands for kilowatt-hour; a kWh is a measure of energy (not power). This is what your power retailer charges you for in your power bill as it is the amount of energy you have used in the month.
If your solar panels (for example) continuously output 1kW of power for 60 minutes, they will have produced 1 kWh of energy.
The amount of electricity you use (or generate) is defined in kWhs. e.g. “My solar system produced 4 kWh of electricity today!”
So at the highest level: kW measures power, and kWh measures energy.
The average number of hours per day when solar irradiance reaches an average of 1,000 watts of electricity per square metre.
The policy that allows small-scale electricity generation, like rooftop solar, to be connected to the national grid.
The rate at which your electricity retailer buys back excess electricity generated by your solar system.
New Zealand’s goal to generate 100% of its electricity from renewable sources by 2030.
Understanding solar terminology is crucial for making informed decisions about adopting solar energy for your home. As solar technology continues to advance and become more affordable, it’s an increasingly attractive option for New Zealand homeowners looking to reduce their energy costs and environmental impact.
We encourage you to continue exploring solar energy options and contact your local solar providers to determine the best solution for your home. Remember, investing in solar power is not just about immediate savings—it’s a long-term commitment to sustainable living and energy independence.
—
This article was first published in 2018
COMMON TERMS
One of the key considerations for most people considering a home solar system is the potential return on their investment (ROI). While the upfront cost of installing a solar system can be significant, the long-term savings on electricity bills and other benefits can make it a smart financial decision in many cases. The solar experts at Current Generation break down the factors that impact your ROI and help you make an informed choice for your home or business.
These are some key factors that can affect the ROI of a solar PV (photovoltaic) system:
The size and cost of your PV solar system will have an impact on your ROI. A larger system will generally be cheaper on a per Watt basis and may provide greater savings over time resulting in a higher ROI. However, it will also have a higher upfront cost and, once your self-consumption needs are largely met, there becomes a point where the ROI likely starts to diminish because the additional power produced is never being self-consumed, it is all being exported. While current export rates offered by many power companies are making exporting power and the related ROI significantly more appealing, it is still important to choose a system size that is appropriate for your energy goals and budget.
The amount of electricity your home or business uses, the time of day it is used and the rates you pay for that electricity, will have the biggest effect on your ROI. If you have high electricity usage, use a lot of your electricity during the day and/or have high electricity tariffs, you will likely see greater relative savings from your solar PV system. It is important to review your electricity bills and usage patterns to estimate your potential savings, and to consider any likely changes in your energy needs or tariffs over time. This is something a reputable, experienced solar installer can assist with.
There are currently some great financing options available for solar in New Zealand, which can help to reduce the upfront cost. These are predominantly low-interest loans from the banks. With the right financing, you may even see an improved ROI.
Unfortunately, there are generally no incentives in the form of subsidies or tax credits available for the installation of solar in New Zealand.
The performance and maintenance of your PV solar system will also affect your ROI. A well-designed and properly maintained system will generally produce more energy and last longer, providing greater savings over time. It is important to choose high-quality components and work with a reputable installer to ensure optimal system performance. While the maintenance requirements shouldn’t be onerous, reasonably regular cleaning of your panels, particularly if you live in an area with a lot of dust, pollen or salt in the air, will help with ongoing performance and, therefore, improved ROI.
Installing a PV solar system can also increase the value of your property, which can provide an additional financial benefit beyond energy savings. Studies have shown that homes with PV solar systems can sell for a premium compared to similar homes without solar, and that this premium, in some cases, can be significantly more than the initial system cost. A study by homes.co.nz in 2020 showed that a 3kW solar installation could increase the sale price of a house by as much as $35,000 when compared to similar houses. An Australian study also suggested increases in property prices attributable to solar of $6,500 per kW of installed solar. There are also a number of American studies which support the increase in property values due to the installation of solar. As power generation and prices become more challenging in New Zealand, the value placed on PV solar by prospective buyers is only likely to increase.
While every situation is different, here are some general estimates based on current market conditions:
Of course, these are just rough estimates, and your actual ROI will depend on your specific circumstances and system design. It’s important to work with a reputable installer who can help develop a detailed ROI analysis for your solar PV system, taking into account all of the relevant factors and assumptions. By doing your research and making informed decisions, you can maximise the financial and environmental benefits of going solar, and enjoy a strong return on your investment for years to come.
Solar panels are where it all begins for any solar energy system, responsible for converting sunlight into usable electricity. Also known as photovoltaic (PV) modules, solar panels are made up of a series of interconnected PV cells that use semiconductor materials to generate an electrical current (direct current or DC electricity) when exposed to light.
The most common type of panel for residential/home solar systems is the crystalline silicon panel, which comes in two main forms – monocrystalline and polycrystalline. Monocrystalline panels are made from a single continuous crystal of silicon, giving them a characteristic black colour and the highest efficiency ratings. Polycrystalline panels are made from multiple silicon crystals melted together, resulting in a blue speckled appearance and generally lower efficiencies but often a lower price point.
As solar technology continues to advance, new types of panels are emerging, such as thin-film modules, bifacial panels, and building-integrated PV (BIPV). However, crystalline silicon panels remain the workhorse of the industry, offering a proven, reliable, and cost-effective solution for most applications.
You may also hear about N-Type or P-Type panels. This refers to technical differences in the type of crystalline silicon wafers which make up the so-called ‘bulk’ and ‘emitter’ regions. Generally, N-Type panels are slightly more efficient than P-Type panels.
Solar Panel Fine Tuning Process
Solar panel performance is typically measured in watts (W), indicating the maximum power output under standard test conditions. Residential solar panels usually range from 250W to 450W each, with 60 to 108 PV cells (or half-cut cells) per panel. The efficiency of a panel refers to how much of the sun’s energy it can convert into usable electricity, with most modern panels averaging greater than 20% efficiency with the best panels now greater than 22%.
When designing a solar power system, the number and wattage of panels needed will depend on factors like the property’s energy consumption, available roof space, shading, and local climate. Panels are mounted on the roof or ground using flush racking, tilt racking, or tracking systems that follow the sun’s movement.
They are then wired together in series to form ‘strings’. In turn, these strings can be connected in parallel before being fed into a MPPT (maximum power point tracking) solar controller (often called a charge controller). Solar controllers are sometimes standalone units which vary the direct current (DC) electricity from the panel into DC electricity that meets the input requirements of either a battery or inverter downstream of it.
Solar controllers can be built directly into inverters. The inverter’s fundamental purpose is to convert DC electricity to AC (alternating current) electricity that we use in our daily lives, but some inverters can also charge a battery, either by passing the DC electricity from the panels straight through to the battery (at a specific voltage that is required for charging the particular battery) or by converting AC electricity into DC electricity (batteries only charge and discharge DC electricity). An inverter that has solar controller functionality, converts DC to AC, charges a battery and is grid compatible is called a ‘hybrid’ inverter.
The lifespan and durability of solar panels are key considerations, as they are exposed to the elements year-round. Most quality panels come with performance warranties of 25 years or more which mean they will still be producing somewhere between 80 and 90% of their rated power (depending on the warranty) at the end of this warranty period. The panels are designed to withstand hail (typically up to 25mm hailstones), snow, wind, and temperature extremes. Reasonably regular cleaning and inspection should help maintain panel performance over time.
Most modern solar panels will work well in New Zealand. Here are some key factors to look for in solar panels for the conditions here:
Naturally efficiency is important. However, while a high efficiency panel is definitely desirable, there is a premium for the absolute state of the art panels which doesn’t stack up for most people on a watts per dollar basis. Most NZ installers currently install panels providing between 400W and 440W of peak output, this being the sweet spot between high efficiency and value. Efficiency and, therefore, panel ratings are also improving all the time as the technology advances.
The temperature coefficient of a panel is the measure of how much the performance degrades with each degree warmer the panel is (the standard test condition is 25 degrees, panels often get warmer than this even if the ambient temperature is lower). Panels with a low temperature coefficient are better able to maintain their performance in hot weather. Look for panels with a temperature coefficient of -0.35%/°C or better.
NZ’s weather can also be harsh on solar panels, with high winds and hail. While snow is rare in the Nelson, Marlborough and Tasman regions, it is an important consideration elsewhere in the country – especially off-grid, high-country installations. Choosing panels with robust construction and high wind and snow load ratings can help ensure they withstand the elements over their 25+ year lifespan. Look for panels with a wind load rating of at least 2400Pa and a snow load rating of at least 5400Pa, especially if your installation is in an area prone to heavy snow.
While the top of the South Island is one of the sunniest places in NZ, there can still be cloudy and overcast days. Panels with advanced cell technologies like PERC (passivated emitter rear contact), bifacial design, and half-cut cells can help maintain output even in low light conditions. For those lucky enough to be in the Nelson/Marlborough region, low-light performance may be less of a priority compared to other factors like efficiency and durability.
Given the long-term nature of a solar investment, it’s important to choose panels from reputable manufacturers with strong warranties and quality control. Look for panels with a product warranty of at least 12 years and a performance warranty of at least 25 years, guaranteeing a minimum output level over time.
Solar panels are the heart of any solar energy system, transforming sunlight into clean electricity. Whether you choose traditional crystalline panels or cutting-edge thin-film designs, it’s crucial to consider efficiency, durability, low-light performance, and warranty when selecting panels for New Zealand’s diverse climate. But a successful solar system goes beyond just panels – effective design that accounts for your unique energy needs, space, shading, and local weather is key to maximising performance and returns. By partnering with experienced solar professionals to create a tailored solution, you can fully harness the power of solar.
As technology advances and more people recognise the environmental and financial benefits of solar, New Zealand’s renewable energy future looks bright. By embracing solar power, Kiwis can reduce reliance on fossil fuels, cut emissions, and build a more resilient energy framework. With the right panels, design, and support, solar energy has the potential to revolutionise how we power our homes, paving the way for a greener, more prosperous future for all.
