This page explains solar, batteries, and the rebate like you're chatting with a friend. No big words. Short answers. You'll understand the whole thing in about 5 minutes.
It's just a way to measure electricity. Like litres for petrol.
That uses about 0.2 kWh. So 5 boils = 1 kWh.
That's about 0.4 kWh. TVs are pretty efficient.
That's about 1.5 kWh. Quiet, but always on.
Solar makes electricity. A battery stores it. That's the whole thing.
Live on your roof. Make electricity when the sun is up. Stop working when the sun sets.
The problem: you make heaps of power during the day when nobody's home. At night you have to buy expensive power back from the grid.
Lives on a wall in your garage. Saves the daytime solar power for when you need it.
The fix: instead of giving your solar away cheaply during the day, you save it. Then you use your own free power at night.
Type your address. We'll show you what an installer sees when they check your house.
It's a discount. The government pays it. The installer takes it off your bill.
You don't fill out forms. You don't wait for a cheque. The installer drops the price for you and gets the rebate back from the government themselves.
From the WA state government.
Country gets more because batteries help reduce diesel generators out there.
From the Australian government.
This one shrinks every year (see Question 8).
You get both. They add together. For a normal battery in Perth, the total discount is around $9,500. You pay the rest.
Yes. Almost always. Here's why.
A battery only saves you money when free solar is filling it up. Without solar, you'd be buying grid power to charge it — which defeats the point.
If you already have solar: great, you can add a battery. The installer will check that your existing setup will work with it. Most do. If not, they'll suggest a small upgrade as part of the job.
Probably smaller than the salesperson will try to sell you.
Easy rule. Find your last power bill. Look for the number "average daily usage" - it'll be something like 22 kWh per day. Then:
Some installers will push you toward a 20 kWh system "for the future". For most homes that's way more than you need.
Why? Because the WA government discount is capped. You don't get more money for a bigger battery. You just spend more out of pocket.
It's just which company sells you power. You don't pick. Your postcode does.
If you live in Perth or anywhere nearby, you're on Synergy.
Postcodes: 6000-6385 and 6800-6999.
Max discount: $5,000.
If you live up north, out east, or anywhere regional, you're on Horizon.
Postcodes: 6386-6799.
Max discount: $7,500 (bigger because regional WA relies on diesel).
Four short steps. Takes you about a minute.
Two real reasons. No fake "act now" stuff.
It's meant to phase out by 2030. Here's the schedule:
Plain numbers: for a 13.5 kWh battery, waiting until next year costs you about $945 extra.
There's only enough money in the pot for 100,000 households across the state.
Once that's used up, the WA discount ends. People are signing up fast, so it'll probably run out by 2028.
After it runs out: only the federal discount left, which by then is much smaller.
Yes. Email wattsmyrebate@outlook.com and I'll answer within a few hours.
I'm Christian. I built this site. There's no call centre. No salesperson. Just me, replying to your email like a normal person.
Ask anything. "I live in an apartment, does any of this work?" "My roof is shaded, am I wasting my time?" "I don't even understand my power bill." All fine questions. No judgement.
If you want to see your exact discount: run the calculator. If you want quotes from 3 installers: fill in the form. Both are free.