solar power calculator

How to Calculate the Length of Time It Takes a Battery to Charge from a 12v Solar Panel The time taken for a solar panel to charge a battery depends on the current of the panel. As battery capacity is measured in Ah (amp-hours), you need to know the solar panel current to estimate, how quickly it will charge your battery. For example, A 200W solar panel normally produces 8 Ampere per hour on a sunny day. If you have a 100A/h battery, this will take approximately 200/8 = 13 hours of sunshine to charge from 0% to 100%. The current produced by a12 volt solar panels or charging kits is...