The question is: "What size of charger is needed to charge my battery (bank)?"

This calculator can assist you to determine the required ampere rating to charge your battery (bank) used under a load application.
1. Determine the current of your load.
2. Decide how quickly you wish to charge the battery. (use 1.4 for a lead acid battery)
3. Determine the type of your battery.

The formula: ((Ah x rf) / time ) + load = A (size of the charger)