Solar Panel → Battery Charging Calculator

Calculate how long it will take to store energy from the solar panel into the battery — suitable for scooters, storage batteries and DIY projects.

Panel power (W)

Panel nominal voltage (V) (optional)

Charge controller

Controller efficiency (%)

System losses (%) (cables, temp, inverter if any)

Peak sun hours per day (h)

Battery capacity (Wh)

Battery nominal voltage (V)

Recommended max charge (C-rate)

What is C-rate? 0.2C means a charging current equal to 20% of the capacity — i.e. current = 0.2 × Ah. For example: 10 Ah battery × 0.2 = 2 A.

If custom, enter C as decimal (e.g. 0.3)

Notes / target

Fill the inputs and click Calculate.