Solar System Size Calculator

Published: 22 Oct 2026

Solar System Size Calculator

Enter your estimated electrical load to get an initial solar system estimate.

Total running load (watts)

Daily usage (hours)

Peak sunlight hours per day

Solar system type

Required backup time (hours)

Enter your details and click Calculate.

Estimates only. Actual system design depends on appliance starting surges, daytime versus nighttime consumption, local sunlight, roof conditions, battery chemistry, inverter specifications and applicable electrical codes. Have the final design checked by a qualified solar professional.

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