Battery Round-Trip Efficiency Calculator

How Battery Round-Trip Efficiency works

For this case, apply efficiency = output energy ÷ input energy × 100. Battery Round-Trip Efficiency uses Discharged energy, Charging energy to report Round-trip efficiency.

With the loaded values, round-trip efficiency evaluates to 82.00%. Compare low and high values without overwriting the starting case. Use Battery Heat Generation Calculator to a separate battery heat calculation.

Inputs for Battery Round-Trip Efficiency

Discharged energy and Charging energy belong to Battery Round-Trip Efficiency. Keep source units with discharged energy.

The sample case is a worked example, not a design target.

Discharged energy

Example entry: 820 Wh.

Charging energy

Example entry: 1000 Wh.

Reading the Battery Round-Trip Efficiency result

This output represents Battery Round-Trip Efficiency.

Component selection requires more than the arithmetic result; verify margins, transients, and published ratings.

Measurement and units

Battery calculations depend on chemistry, temperature, age, discharge rate, and the limits of the battery management system. Check prefixes on discharged energy.

Do not compare cases built from different unit prefixes or measurement locations.

Limits of this calculation

Compare complete cycles with the same start and end state of charge.

Only the stated inputs participate in this simplified model. Unentered effects remain outside Battery Round-Trip Efficiency.

A useful Battery Round-Trip Efficiency comparison

Record round-trip efficiency before testing a different discharged energy value. Charging power can be checked in Battery Charging Power Calculator.

Document the alternate discharged energy source.

Questions about Battery Round-Trip Efficiency