Solar + Battery Home Calculator
Size a residential solar panel and battery system based on energy usage, sun hours, roof space, and grid independence goals.
Inputs
kWh
hrs/day
sq ft
%
$/kWh
Results
Solar Panels Needed
15
System Size6 kW
Battery Capacity14.2 kWh
Estimated System Cost$28,160
Annual Savings$1,255.53
Payback Period15.7 years
How to Use This Calculator
- Enter Monthly kWh from your last 12 months of electricity bills and your daily Peak Sun Hours (4–6 for most US locations).
- Input Roof Sq Ft available for panels and set Grid Independence (%) — 80% is a common target for backup reliability.
- Enter your current Electric Rate ($/kWh) to calculate the financial payback after the 30% federal tax credit.
- Review Panels Needed, System kW, and Battery kWh to size the system for quotes from solar installers.
- Check System Cost as an estimated all-in cost before incentives, then compare to Annual Savings.
- Use Payback Years to evaluate the investment against a 25-year panel warranty and local utility rate trends.
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