Solar Calculator

What to charge the battery to overnight on off-peak, so tomorrow's solar covers the rest.

1. Your roof

Latitude

Longitude

Array size kW peak

Roof tilt degrees

Roof azimuth degrees, 180 = south

Enter it by hand, or fetch a forecast for the roof in step 1 from Forecast.Solar

Expected solar 12.0 kWh

Confidence

Adjust daily use with the seasons for the best results

Battery capacity kWh

Current charge 10%

Daily use 20.0 kWh

Battery efficiency 95%

Safety buffer 10%

–%

target battery charge

Calculating…

Solar expected

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Shortfall

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In battery

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Charge overnight

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