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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.)
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.
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%.
Solar
5.9–7.7 kW
~8,614–11,242 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.
Got a quote? Drop the proposed sizes in here and we'll flag any sizing issues.
Sizing checks pass
Your solar/battery combination is within typical ratios for a Perth household and shouldn't have under- or over-spec issues.
Daily gen
26.4 kWh
Annual gen
9,636 kWh
Evening load
10.8 kWh
Battery vs evening
93%
Production estimates use Perth peak-sun-hours (5h/day BOM avg) and 80% system derate (annual average). Mid-winter generation is typically ~65% of this. WA Battery Rebate eligibility window (4–14 kWh) and single-vs-three-phase thresholds are flagged automatically.
Our quiz hands your proposed size to CEC-accredited installers so the quote you get back is sized like this — not just whatever they had in stock.