Your Electricity Usage
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Choose Your Solar Setup
Adjust assumptions to fit your roof and project
Your Solar Estimate
Automatically updates as you change inputs
Savings assume generated energy offsets billable units up to your estimated annual usage; excess export earns no credit in this conservative model. Real performance, grid policies, financing, replacement costs, taxes, roof suitability and outages can significantly change results.
Illustrative Monthly Generation
Seasonal distribution is an illustrative profile, not a weather forecast for your address.
How This Calculator Works
1. Estimate electricity use
Your monthly bill minus fixed charges is divided by the effective unit rate, unless you enter units directly.
2. Size your solar system
Target electricity consumption is divided by estimated daily generation per kW. Sizing rounds up in 0.5 kW increments.
3. Estimate your return
Calculate installed cost, potential bill savings, maintenance and 25-year projection based on your assumptions.