Battery support duration calculator

Constant-load duration is usable delivered energy divided by the requested discharge power.

t = \frac{E_{\text{nom}} \times \mathrm{DoD} \times \eta}{100 \times 100 \times P}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

t = \frac{600 \times 75 \times 92}{100 \times 100 \times 150} = 2.76

Symbol	Meaning	Unit
$t$	constant-load support time	h
$E_{\text{nom}}$	nameplate DC energy	kWh
$\mathrm{DoD}$	permitted depth of discharge	%
$\eta$	discharge conversion efficiency	%
$P$	constant AC discharge power	kW

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.