Translations:Simplified PWM charge controller sizing and selection/9/en

Step 3: Total PV source current

This calculation will give a minimum current rating to use as a basis for selecting the charge controller. The Isc rating of the PV module can be found on its specifications sheet. This value is multiplied by a required 1.25 safety factor to make sure the charge controller can handle periods of excessive current due to high irradiance.

Total PV source current	= Final number of PV source circuits (Step 2) × Isc rating of chosen module (Step 1) × 1.25