Solar Payback Calculator
Size a rooftop system from your monthly consumption, then see savings and payback with the tariff and installed cost you enter.
Add a tariff and/or system cost to unlock the savings and payback lines.
Estimate
Daily units needed
from monthly usage ÷ 30
Required system size
after inverter losses
Panels (550 W class)
rounded up
Roof area
@ 2.1 sq m/panel
Monthly generation
geographic estimate (yr 1)
Covers about 100% of your monthly bill with the settings above. A real quote needs site shading, direction and net-metering rules.
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