Estimate how long a battery takes to charge from a solar array or charger.
Charging is at full power only up to roughly 80 per cent state of charge, after which the current tapers to protect the cells. The bulk phase figure is the practically useful one. Solar charging power varies through the day, so real charge times are longer than a fixed-power calculation suggests.
Battery Charge Time
Time = energy to replace ÷ (charge power × efficiency)
Time = energy to replace ÷ (charge power × efficiency) Charging is at full power only up to roughly 80 per cent state of charge, after which the current tapers to protect the cells. The bulk phase figure is the practically useful one.
Solar charging power varies through the day, so real charge times are longer than a fixed-power calculation suggests.
This calculator takes 4 inputs: Battery capacity, Starting state of charge, Charging power available, Charging efficiency. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.