Off-Grid solar system costs

Off-grid solar system cost by system size

We size every system to your daily energy use, measured in kilowatt-hours (kWh) a day. That figure sets the size of the battery bank, the solar array and the inverter/charger, so it's the biggest single driver of what you'll pay. Here's where each of our four off-grid systems starts.

The starting price is for a basic system at the bottom of each size band. Most homes need a bit more, which is what the second column shows. All prices include rebates and are a guide only. They're for standard installations with customer-provided site preparation and infrastructure.

Not sure which band you're in? Use the energy usage selector further down this page. Move the slider to your daily use, or work it out from a power bill, and it shows the system that fits.

Why off-grid solar costs more than grid-connected solar

A grid-connected solar system can lean on the grid at night and on cloudy days. An off-grid system can't, so it has to do everything itself: generate enough power in winter, store enough to get through the night, and start a backup generator when the batteries run low. That means a larger battery bank, a bigger inverter/charger and a generator, none of which grid-connected solar needs.

In return you have no electricity bills and no supply charges. For a property with no power on site, extending the grid can be a large cost in itself, so it's worth comparing a price for both.

How to keep the cost of an off-grid system down

The cheapest kilowatt-hour is the one you don't need to store. Most of the savings come from how you use power, and they're decided before the system is designed, so it pays to think about them early.

Run heavy loads while the sun is up

Pumps, washing machines, dishwashers and workshop tools running in the middle of the day are powered straight from the solar array. The same loads at night have to come out of the batteries. Moving them into daylight hours means a smaller battery bank can do the same job.

Look hard at the biggest loads

Electric heating, older fridges and freezers, and pool pumps can account for a large share of a property's daily use. More efficient appliances, or a different fuel for heating and hot water, can drop a property into a smaller system size, and the saving on the system can be bigger than the cost of the appliance.

Get the load profile right

An accurate picture of what you run and when stops a system being oversized "just in case". It also stops it being undersized, which costs more in generator fuel over the years than it saves up front. Our team builds the load profile with you before we design anything.

Sort out the site early

Because our prices assume customer-provided site preparation and infrastructure, planning where the solar array, batteries and generator will go, and how the cabling gets between them, keeps the installation straightforward.

Do rebates apply to off-grid systems?

Yes. Federal government rebates exist for eligible applicants, ranging from $1,700 to $30,000 depending on how much renewable energy is included in the final system. They're paid as small-scale technology certificates (STCs), and we can handle the paperwork for you.

Read how solar STCs and theCheaper Home Batteries Program work, or see everysolar and battery rebate by state.

How to get an accurate price for your property

1. Contact. Call our team on 1300 334 839 or fill out the quote form below.
2. Assess. We assess your energy requirements and what you want the system to do.
3. Design. We design a system to suit your usage, your objectives and your site requirements.
4. Quote. You get a quote for that design.

A load profile is the most useful thing you can bring: the appliances you run, roughly when you run them, and any big loads like pumps, workshops or air conditioning. If you're replacing a grid connection, a year of power bills does the same job.

Common questions about off-grid costs

Is an off-grid solar system worth it?

It depends on your site. If you're building where there's no grid, off-grid is often the obvious choice. If you already have a good grid connection, in most cases it's better to keep it as a backup to a grid-connected solar and battery system, such as our Autonomy orGrid Support systems.

Can I disconnect my house from the grid?

Yes, you can disconnect from the electricity grid in Australia. It involves extra costs and paperwork, and the requirements vary between retailers and network businesses. Ourgrid defection page explains how we design the system and guide you through having the meter removed.

What does an off-grid system cost to run?

Mostly fuel and servicing for the backup generator. The more of your energy comes from solar, the less the generator runs, which is why we design each system around your load profile and your site.

Last updated 5 November 2026.