Solar System Size Calculator — Monthly kWh to System Size and Panel Count
Enter monthly electricity usage (kWh) and your state to calculate recommended system size (kW) and panel count.
Usage & Location
Check your utility bill
How to Use the Solar System Size Calculator
Enter monthly electricity usage (kWh) and your state to calculate recommended system size (kW) and panel count.
This free online solar system size calculator is designed for solar installers and field technicians who need fast, accurate results on the job or during the estimating process. No account required — enter your values and get results instantly.
When to Use This Tool
- 1.During new construction estimates and material takeoffs
- 2.When verifying calculations in the field before ordering materials
- 3.For proposal and quote preparation — give clients accurate numbers
- 4.As a cross-check against manual calculations or software output
- 5.For training new technicians on correct sizing procedures
Important Notes
Results from this solar system size calculator are estimates based on standard industry formulas and typical conditions. Always verify critical calculations with manufacturer specifications, local codes, and a licensed solar installer before proceeding with installation or ordering materials. Actual requirements may vary based on local building codes, site conditions, and project-specific factors.
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