Solar panels and a battery for your Perth home
Some Perth homeowners install solar and storage together. Others add a battery to solar they already have. Both work, but the two decisions interact, and getting the order and sizing right saves money and rework.
The panels and the battery are one system
A battery only stores what your panels produce beyond your daytime usage. If the solar is undersized, a big battery cannot fill. If the solar is generous, a battery captures export that would otherwise earn a low feed-in credit. Size them as a pair, not as two separate purchases.
Buying solar and a battery together
Installing both at once has real advantages. The system is designed as a whole, so the panel array, inverter, and battery are matched from the start. A single hybrid inverter can handle both, which is usually tidier and cheaper than bolting a battery onto a system that was not planned for one. And there is only one install, one approval, and one crew.
The trade-off is a larger upfront cost, because you are paying for the whole system at once rather than spreading it.
Adding a battery to existing solar
If you already have panels, you can add storage later, and many Perth homes do. The main thing to check is your existing inverter. If it is not battery-ready, you may need a hybrid inverter or a separate battery inverter, which adds cost the "together" path can avoid.
It is still often worthwhile, especially as evening electricity rates and low feed-in credits make self-consumption more valuable. Just go in knowing the inverter question can change the numbers.
How the WA rebate and Synergy tariffs factor in
Western Australia's battery rebate applies to eligible Synergy households within a capped amount, and it improves the payback on the storage part either way. On the tariff side, Synergy's feed-in credit for exported solar is typically well below the rate you pay to import in the evening, which is exactly the gap a battery closes. Our rebates page covers current WA eligibility.
Which path suits you
"Is my existing solar inverter battery-ready, or would I need a new one?"
The single biggest factor when adding a battery to existing solar.
"Is my solar array big enough to keep a battery this size charged?"
A battery is only as useful as the surplus your panels can spare to fill it.
"If I install solar now, is it sized so I can add a battery later without rework?"
Worth asking even if you are not buying storage today.