ClueLuma

Storage round-trip efficiency (RTE) calculator

Compare energy delivered and purchased at the same boundary over a complete storage cycle.

RTE=EoutEin×100\mathrm{RTE} = \frac{E_{\text{out}}}{E_{\text{in}}} \times 100

Calculator

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

kWh
kWh
%

Worked example

Given

  • EoutE_{\text{out}} = 720 kWh
  • EinE_{\text{in}} = 900 kWh
RTE=720900×100=80\mathrm{RTE} = \frac{720}{900} \times 100 = 80

Symbols and units

SymbolMeaningUnit
RTE\mathrm{RTE}cycle efficiency%
EoutE_{\text{out}}cycle delivered energykWh
EinE_{\text{in}}cycle charging inputkWh

Related calculators

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