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Tell us how much energy you use, and we'll recommend a system size that fits — with explicit warnings if your inputs don't match the physics. (Bigger isn't always better — an over-spec'd battery just costs more without delivering extra savings.)
General information, not financial advice. Rebates and tariffs change.
Start here
Perth average: ~18 kWh/day. Check your Synergy bill — the quarterly total ÷ days = your daily average.
The share of your daily usage that runs after the sun sets — what the battery has to cover. Typical Perth household: 50–70%.
Recommended for your usage
Solar
5.5–7.2 kW
~8,532–11,169 kWh/year
Battery
10–14 kWh
Sized to cover evening load
Solar sized to power daytime load and charge a battery; battery sized to cover most evenings without over-shooting.
Check a quote
Straight off the quote: the panel array size, not the inverter.
Usable capacity, which is what the WA Battery Rebate window is measured on.
Daily generation
28.1 kWh
Annual average day
Annual generation
10,238 kWh
Over a full year
Evening load
10.8 kWh
60% of 18 kWh/day
Battery vs evening
93 %
Sizing checks pass
Your solar/battery combination is within typical ratios for a Perth household and shouldn't have under- or over-spec issues.
Production estimates use Perth peak-sun-hours (5h/day BOM avg) and 85% system derate (annual average). Mid-winter generation is typically ~65% of this. WA Battery Rebate eligibility window (5–10 kWh) and single-vs-three-phase thresholds are flagged automatically.
This information is general in nature and does not constitute financial, tax, or legal advice. Rebate amounts, eligibility, and tariff rates change frequently and may not be current.
Consult a licensed financial advisor, tax professional, and electricity retailer to understand your specific situation. We are not responsible for financial decisions made based on this information.
We pass your proposed size to an installer from our network that covers your area so the quote you get back reflects your actual modelled system.
Get a quote from an installer from our network that covers your area. You choose whether to act on it. No obligation.