Off-Grid Power Calculator
Size your off-grid solar power system. Calculate panels, battery bank, and system cost based on daily energy usage and sun hours.
Inputs
kWh
hrs
W
kWh
kW
Results
Panels Needed
10
Recommended Battery Bank
28.1 kWh
Estimated System Cost
$19,159
Total Solar Capacity4 kW
Current Autonomy1.6 days
Generator Cost$3,250
Annual Fuel Cost$1,000
How to Use This Calculator
- Enter Daily kWh Usage from your current electricity bills or a load audit of planned appliances.
- Input Peak Sun Hours (4–6 for most US locations) and Panel Wattage for the solar panels you are considering.
- Enter Battery Capacity kWh and Backup Generator kW to size the storage and backup portions of the system.
- Review Panels Needed and Total Solar Capacity (kW) to request quotes from solar installers.
- Check Recommended Battery Bank (kWh) for 2 days of autonomy and Current Autonomy (days) with your current batteries.
- Use Estimated System Cost and Days of Autonomy to decide on the right balance of solar, battery, and generator backup.
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