🔋 Battery Capacity Calculator

enter load and usage duration，by depth of discharge(DOD)and system efficiency，recommended required battery capacity（Ah / kWh）。applicable to off-grid PV、storage、low-voltage system selection。

load power (W)

usage duration (h)

system voltage (V)

custom voltage (V)

depth of discharge DOD (%)

system efficiency (%)

recommended configuration

— Ah — kWh

required energy（load side）—

demand after efficiency conversion—

battery nominal energy（byDOD）—

recommended voltage—

—

formula：energy = power × duration；battery nominal energy = energy ÷ efficiency ÷ (DOD/100)；
capacity(Ah) = nominal energy ÷ voltage。lead-acid recommendation DOD take 50%、LFP can take 80–90%。