Everything you need to size and plan the battery side of a solar system — from capacity and runtime to charging and backup days.
Size a battery bank from your daily energy use and backup needs.
Open calculator →Convert between amp-hours and kilowatt-hours at any voltage.
Open calculator →See how long a battery will power a given load.
Open calculator →Estimate how long a battery takes to recharge.
Open calculator →Size the MPPT or PWM controller that charges the bank.
Open calculator →Charge/discharge current from capacity and C-rate — I = Ah × C.
Open calculator →Browse every tool on the all tools page, or design a full system with the system report builder.