Installation Costs of an Off-Grid Solar System in NZ?
Off-Grid Solar Installation Cost
By Rhys Coffin: Off-Grid Solar Designer, Power Station New Zealand. Updated October 2026. About the Author
The Short Answer
T
his article is an in-depth guide on the costs of the actual installation work done by an installer or electrician. If you are looking for the system or components costs, you’ll find that on our System Sizing and Pricing page.
For new-build or relocatable houses, there isn’t one fixed installation cost when it comes to an off-grid solar system. The cost depends on factors such as the number and location of the solar panels, roof type, cable distances, site access and travel.
There are also costs that are sometimes assumed to be part of the solar installation but are actually associated with preparing the property for power. These can include trenching, long AC cable runs, switchboard work, installing an earth peg and other site-specific electrical work.
Sometimes the electrician wiring the house will also install the solar system, but not always.
Installation costs can also vary depending on the region and how remote or accessible the property is.
Prices will also vary by region and your property’s relative isolation.
Below is a rough guideline for 2026 for the installation and commissioning of an off-grid solar system only. It does not include the components or other electrical or site work.
If you’re comparing the cost of connecting a new property to the grid with going fully off-grid, it’s worth getting an installation estimate early. See our guide Is Off-Grid Solar Worth It? to understand what to look out for.
Estimated installation costs of an off-grid solar system
The pricing below is a 2026 guide based on an easy-access, single-storey corrugated iron or Colorsteel roof, or a straightforward ground-mounted array.
It assumes any required trenching has already been completed and that a suitable location for the batteries, inverter(s) and other equipment is ready to go.
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Looking for more? Check out this 10-minute read Beginner’s Guide to off-grid solar
1. Installation Costs: New-Build House vs Existing House
In our experience, the vast majority of off-grid solar installations in New Zealand are for new or relocatable homes.
We reckon it could be as much as 85% or even more.
With a new-build house, your off-grid solar designer would hopefully be involved in the early stages of planning.
This is important not just for considering the home’s energy efficiency and the selection of low-draw appliances, but also for preparing the groundwork for a clean and straightforward installation.
If installation is considered during the planning stage, the costs could be lower and potential problems can often be avoided.
Predictable off-grid solar installation costs
The cost of an off-grid solar installation for a new-build or relocatable home, including a Tiny House on Wheels (THOW), is therefore reasonably predictable.
With an existing house where an off-grid system needs upgrading or replacement, there are more variables to consider. An accurate installation estimate usually can’t be provided until after a Technical Site Visit.
Decommissioning costs
For a replacement system, one of the biggest unknowns affecting the installation cost is the decommissioning and removal of existing components, including batteries, inverter/s, solar panels and other ancillary equipment.
For example, replacing 18 dodgy 15-year-old 225 Wp solar panels (about 4 kW total) with nine new 460 Wp panels (about 4.1 kW total) means removing those 18 old panels first!
The safe disposal of old batteries and solar panels is another cost to consider.
Taking a grid-connected house off the grid
An existing grid-tied house that is cutting the cord with the power company is usually more straightforward, because the existing electricity reticulation at the property is already in place.
A Technical Site Visit is still essential, but in most cases there won’t be trenching to do or AC cables to run.
The earlier the system can be considered in the house design, the easier it is to plan for an efficient installation.
And if you’re replacing an existing off-grid system, be aware that decommissioning, removal and safe disposal of old components can add to the total installation cost.
2. What’s Included in the Off-Grid Solar Installation Quote?
When we talk about off-grid solar installation cost, we’re referring to the work required to install, connect, test and commission the equipment we’ve supplied.
It does not include the electrical costs of preparing the property for the solar components to be installed.
What’s included in the quote?
For a typical new-build or relocatable home, the installation cost includes:
What’s not usually included in the quote?
Some costs aren’t included in the standard off-grid solar system installation price because they depend on the individual property and can’t be accurately calculated in advance.
A Technical Site Visit may be needed to measure cable and conduit runs, assess access, check the switchboard and determine what other AC electrical or site work is required.
That’s why Power Station and other off-grid solar suppliers can only provide an initial estimate for installation, but not always a confirmed price upfront.
Other costs, such as installer travel, scaffolding or specialist access equipment (if needed), and AC cabling depend on the property’s location and circumstances.
Rather than building allowances into every installation price, these costs are added only where they are actually required.
This is also why we get asked: “Why isn’t installation included in your quote?”
3. Why Can Installation Costs Vary So Much?
o two properties are exactly the same.
Things that seem relatively minor can make a big difference to the cost of installing an off-grid solar system.
The obvious things are the number of solar panels and battery modules, roof type, access (for example, whether it’s a single-storey building) and the distance between the solar array and the inverter.
Where and how the panels are installed can affect more than installation cost. It can also affect the design and cost of the solar system itself.
An unusual or particular feature of your property can increase the installation cost, the equipment required, or both.
The same panels can cost more to install
Installing solar panels flat on an easily accessible corrugated iron or Colorsteel roof is pretty easy.
The same panels on a tiled roof require different mounting hardware and more care during installation. The same applies when panels are installed on tilt legs rather than flat against the roof.
We use tilt legs that sit under your solar panels on a flat-ish roof to catch more sunlight.
More care means more time.
Based on our current installer pricing guidelines, which are used by our approved installers around New Zealand, installing a typical 14-panel array on a tiled roof or using tilt legs can add around 20% to the panel installation component of the installation quote compared with the same panels installed flat on an easily accessible iron roof.
It’s not just the additional time and labour involved in fitting these extra components. There’s also the cost of the components themselves.
And that’s before allowing for the additional cost of the tilt legs or special tile-mounting components themselves.
Roof characteristics can affect the overall system cost
If you’re mounting panels on a roof, the roof’s characteristics don’t just affect installation costs.
They can also affect the overall system design, including the number of panels and batteries you may need.
Consider a common situation:
Let’s say you’re building a new home with a large pole shed nearby. Putting the solar panels on the shed might seem an obvious choice: there’s tons of roof space, it’s easy to access and there’s no need for panels on the house roof.
Before we recommend that setup to you, we would want to know the direction the shed faces, the roof pitch and whether there is any shading, particularly in winter.
Most pole sheds in New Zealand will need tilt legs for solar panels because of the monopitch roof. That can increase both the mounting-component cost and installation labour.
Array orientation can affect costs
The orientation of your solar array can have an effect on costs too.
A north-west or west-facing roof may still be perfectly usable for solar, but it will generate much less energy in the morning than a well-positioned north-facing array.
For a house on the grid, that’s not necessarily a big deal.
For an off-grid home, when energy is generated matters as well as how much is generated.
A west-facing array starts producing useful energy later in the day. In winter, the batteries will need to support the house through the night and further into the following day before there is enough solar generation to power the house loads and begin properly recharging them.
Depending on the property and how the household uses power, additional panels, battery modules or both will probably be needed for a pole shed with a west-facing solar array.
That’s one example about how panel location and orientation can affect the cost of the entire off-grid solar project.
Ground-mounted solar works differently
An engineered ground-mount structure (or a timber DIY platform) adds a component cost that you don’t have when we can use a suitable roof.
Depending on the site, there could be ground preparation or other work involved.
But once the structure is built, installing panels at ground level can be faster and easier than installing them on a roof.
Based on our current installer pricing guidelines, a typical 14-panel ground-mounted array has a panel-installation labour cost approximately 13% lower than the equivalent standard roof array.
That doesn’t mean the whole installation quote is 13% lower, it’s just the panel-installation component of the quote.
And as the number of panels installed on a ground-mounted array increases, the savings compared with a roof installation can increase too.
So a ground-mounted system can have a higher component cost but a lower panel-installation cost.
Access and distance matter too
Other factors can affect off-grid solar installation cost. These include:
Our installation pricing guidelines treat things such as AC cable, DC conduit, travel and specialist height or access equipment separately rather than assuming every customer will need them.
Talk to us early about off-grid installation
We recommend talking to us early on in the planning stages of your project. We’ll guide you through the process.
4. Power Station’s 5-Step Installation Quote Process
Once your off-grid system has been designed and you’re happy with the proposed solution, the next step is to confirm the installation cost.
We use a simple five-step process to do this. It gives the installer the information they need to price the work properly. It also gives us an opportunity to review the quote with you. Finally, it gives you a confirmed installation cost before the project proceeds.
Here’s how it works:
We Design Your System
We start by designing the off-grid system around your property, location and power requirements. At this stage we can also give you a realistic estimate of what we expect the installation to cost. You can read more about system sizing in our article How We Correctly Size Your Off-Grid Solar System.
We Brief an Approved Installer
Once the design is agreed, we provide one of our Approved Installers with the system details, plans, photos and other relevant information. We also provide them with our installation pricing guidelines so they knows what we consider a reasonable cost for the work. All Power Station approved installers are required to be members of the Sustainable Energy Association of New Zealand (SEANZ).
Installer Assessment and Quote
The installer reviews the project, talks with you and carries out a Technical Site Visit if one is needed. They then provide their installation quote directly to you, with a copy to Power Station.
We Review the Quote With You
We review the scope and price and discuss the quote with you before you proceed. Power Station doesn’t add a margin to the installer’s quote, so we can give you our view of whether the proposed work and price are reasonable.
Project Moves to Installation
Once you’re happy with the quote, the project can proceed. Our Operations team then coordinates the Power Station system supply and works with the installer through installation and commissioning.
5. Comparing Off-Grid Solar Quotes: Apples with Apples
We sometimes hear from people who have received another quote for an off-grid solar system:
“Their price includes installation and it’s still cheaper than yours.”
That may well be true.
But before comparing the bottom-line price, make sure you’re looking at the same system and the same scope of work.
Two quotes can look similar on paper while being quite different once you look at the details.
Battery storage, inverter sizing and future solar expandability are all important things to check. Systems can be designed around very different property layouts, winter power generation requirements and daily household usage.
Installation can vary significantly, too. Seeing “installation included” on a website or proposal may not tell you what’s actually included.
Has the installer been to your property to scope the job?
Does the price cover your specific roof type, cable distances, site access and travel?
Are electrical certification and any necessary switchboard upgrades included?
Compare the System, Not Just the Price
If you’re comparing our proposal with another supplier, make sure you check:
A lower-priced quote might save you money upfront, but it could mean a smaller system, lower-quality components or extra costs down the track.
If you’re unsure, get in touch. We’re always happy to help you run a true apples with apples comparison.
6. Why Don’t We Advertise a Fixed ‘Fully Installed’ Price?
We can’t advertise or give you a “fully installed” price upfront because at the start we don’t have all the information we need to be accurate.
What we do instead, until we have more information, is give you our estimate based on expected power use, location and aspects pf yout property.
We use photos supplied by you, satellite imagery and our experience to provide the estimate, but most of the time a Technical Site Visit by an approved installer is needed to confirm our estimate.
And because you should only pay for the work and materials that you actually need, we don’t make blanket allowances for labour or components.
Talk to us early
Talk to us early, even if all you have is bare land. That’s the best way we can help you to not spend money when you don’t need to.
Rhys has been part of the Power Station founding team since 2018. He is passionate about sharing knowledge, especially with people new to off-grid solar. He has personally been involved in designing and planning hundreds of off-grid solar systems throughout New Zealand including the Pacific region. The advice, examples and insights in his articles are drawn from real-world experience, and the experience of the Power Station team .
Contact: rhys@powerstation.nz
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