Solar Panel & Battery Sizing Calculator

Daily Energy Consumption

Battery Voltage

Volts

Backup Days

How many days you want backup without sunlight

Battery Usable Capacity

The part of battery you plan to use (e.g., 50% = half battery)

Sunlight Hours (per day)

Panel Efficiency

Required Battery Capacity: -- Ah

Required Solar Panel Size: -- W

Formulas

Battery Capacity (Ah) =

Daily Energy × Autonomy Days

System Voltage × DoD

Solar Panel Size (W) =

Daily Energy

Sun Hours × Efficiency

Where:
- Daily Energy = Wh or kWh (convert to Wh)
- Autonomy Days = number of backup days
- DoD = depth of discharge (fraction)
- Sun Hours = average peak sunlight hours/day
- Efficiency = derating factor (0–100%)

Solar Panel & Battery Sizing Calculator

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