System Size Calculator
Work backwards from your annual energy usage to find the exact kW system size required to offset it.
Target Usage
Find this total on your utility bill.
Daily average for your location.
System losses from inverter, wiring, dirt.
Required System Size
This is the total capacity your panels need to add up to. For example, a 6.0 kW system could be made of fifteen 400-watt panels.
Disclaimer: The results provided by this tool are estimates intended for educational purposes only. They rely on the assumptions and average values provided in the inputs.
True costs, savings, and system designs depend heavily on your specific roof, local utility rates, and actual equipment choices. For exact figures and custom system design, you should consult directly with a local solar installer.
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