Solar System Size Calculator
Size a solar array from your usage and sun hours.
Result
Panels needed
—
Roof area needed
—
Suggested system size
—
Formula
Calculation logicWhat to check
- Annual kWh usage
- Peak sun hours for the site
Related calculators
Calculator
25-Year Cash Flow Milestones
Cumulative net at years 10, 15 and 25 with escalation and degradation.
Open calculatorCalculator
Azimuth Direction Loss Calculator
Annual loss vs true south by azimuth choice.
Open calculatorCalculator
Battery Backup Hours Calculator
Runtime for critical loads from usable kWh.
Open calculatorCalculator
Battery Bank Size Calculator
Off-grid battery bank from daily use, autonomy, and discharge depth.
Open calculatorSaved calculations
Keep the assumptions with the result.
Save this calculation to return to the inputs, result, and report anytime.
Sign in or create an account to save this calculation.