Gridly
Solar System Sizing Calculator
Find the right solar system size for your home. Enter your daily energy use, state, and plans for EV charging or battery storage.
Check your electricity bill for kWh/quarter, divide by 91
Your Results
Minimum system size (kW)
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to cover your daily needs
Recommended size (kW)
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with 15% shading/orientation buffer
Annual generation (kWh)
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at recommended size
Daily requirement (kWh)
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Peak sun hours
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Excess generation %
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STC Rebate
A 6.6kW system in most states qualifies for $1,600-$2,500 in Small-scale Technology Certificates (STCs). Calculate your exact rebate with our STC Calculator.