Ever wondered what actually happens to all the extra electricity your solar panels make on a sunny afternoon? It gets stored, sent back to the grid, or wasted. Which one happens depends entirely on your system: on-grid, off-grid, or hybrid.
If you’re looking into an off-grid solar system for a property in regional Victoria, here’s what it actually involves, in plain terms.
On-grid, off-grid or hybrid: which one do you need?
- On-grid: Solar panels power your home. Extra power goes back to the grid for a small credit. No battery, and the grid covers you at night.
- Hybrid: On-grid solar plus a battery. Instead of sending your extra solar back to the grid for a small credit, you store it and use it at night. The grid is still there as backup.
- Off-grid (a stand-alone solar system): No grid connection at all. Every watt you make has to be stored and used on the property, or it’s wasted. A battery and a generator do the job the grid would normally do.
Here’s the honest bit: most people searching for off-grid solar actually want hybrid. If your property already has grid power, hybrid gets you lower bills and blackout backup for a lot less money. A true off-grid solar power system makes sense when there’s no grid connection nearby, or connecting would cost tens of thousands of dollars, which happens often on farms and remote blocks across regional Victoria.
How much power do you actually use?
Before sizing anything, you need a real number: how many kWh your household uses per day, especially in winter, when solar makes less and heating uses more.
Don’t forget the big stuff: bore pumps, workshops, a second fridge, and electric hot water. And decide how many cloudy days in a row you want to be covered for. That number drives everything else.
Sizing your system
Panels: Off-grid arrays are sized much bigger than a grid-tied system for the same house, often 2 to 3 times bigger, so they can recharge the battery even on a short winter day.
Battery: Sized around your daily use and how many cloudy days you want covered. Lithium batteries are the standard for off-grid solar batteries in Australia. Most regional Victorian homes need somewhere between 20 kWh and 60 kWh.
Inverter: Needs enough grunt to start a bore pump or workshop motor without tripping. We install Victron and Fronius gear because it’s built for real off-grid conditions.
Generator: Yes, you still need one. It’s backup for the odd stretch of grey winter days your solar and battery can’t cover. Skipping it usually means paying more for a bigger battery instead.
What does it really cost?
Rough planning numbers only, every property is different:
Worth knowing: connecting a remote property to the grid can cost more than this. The government’s own battery rebate rules treat anything over $30,000 to connect as effectively off-grid.
Can you still get a rebate?
Yes, and here’s the good part. Off-grid batteries don’t need to be VPP-capable (basically, internet-connected) to get the federal battery rebate. On-grid batteries do. Off-grid ones don’t. You still need CEC-approved gear and an accredited installer either way. We break the rebate maths down properly in our solar battery cost guide.
The mistakes we see most
- Sizing for a sunny day instead of the worst week of winter
- Skipping a proper load check and guessing
- Cutting the generator to save money
- Buying a DIY kit and self-installing, which can void your rebate
- Not budgeting for a battery replacement down the track
Real Victorian homes, done properly
We’ve helped more than 2,000 homes move to solar across regional Victoria and beyond, including plenty of off-grid and regional properties. Here’s how we’ve supported local customers around Echuca Moama.
Thinking about going off-grid? Start with a free load assessment, no pressure, no obligation.
Book a free load assessment or check out our off-grid and hybrid systems page.
FAQs
What does an off-grid solar system cost?
Roughly $15,000 to $25,000 for a small cabin or weekender setup, $28,000 to $45,000 for a modest family home, and $45,000 to $70,000 or more for a full-load home. The battery is usually the biggest cost, not the panels. Your actual price depends on how much power you use, how many cloudy days in a row you want covered, and how much site work is needed to get everything connected properly.
How do I size an off-grid system?
Start with your real daily electricity use, not a guess, especially through winter when solar output drops and heating use goes up. That number decides how big your battery needs to be. From there, your panels get sized big enough to recharge that battery even on a short winter day, and your inverter gets sized to handle the biggest single load it will ever need to start, like a bore pump or a workshop motor.
Can I get a rebate for off-grid?
Yes. Off-grid batteries qualify for the federal Cheaper Home Batteries Program the same as any other battery, and they don’t need to be VPP-capable (meaning internet-connected and able to respond to grid signals) the way on-grid batteries do. You’ll still need a Clean Energy Council approved battery and inverter, installed by an accredited installer, for the rebate to apply.
Do I still need a generator?
In almost every case, yes. Even a well-sized system will occasionally hit a run of grey winter days where solar output drops and the battery runs low. A generator covers exactly that scenario. It’s usually the cheaper option too: paying for a generator that runs a handful of times a year normally costs less than paying for extra battery capacity you’d rarely use the rest of the time.
