Battery Round-Trip Efficiency Calculator

Calculate round-trip efficiency, energy losses, and cost of losses for battery charge/discharge cycles.

Input Parameters

Results

--
Round-Trip Efficiency
%
--
Energy Loss Per Cycle
kWh
--
Daily Energy Loss
kWh
--
Annual Loss Cost
$
Note: Lithium-ion batteries achieve 90-95% RTE, lead-acid 75-85%, flow batteries 65-80%. Higher RTE reduces lifetime cost.

Reference

Round-Trip Efficiency = (Energy Out / Energy In) x 100 Energy Loss = Energy In - Energy Out Daily Loss = Loss/Cycle x Cycles/Day Annual Cost = Daily Loss x 365 x Rate