Formula and meaning
The calculation compares energy measured at the wallbox or grid with energy actually stored in the battery.
η = E₍battery₎ / E₍grid₎ · E₍loss₎ = E₍grid₎ − E₍battery₎ · loss% = (1 − η) · 100
E-mobility · energy balance
EV charging loss calculator
Calculate charging efficiency, lost energy, and optional charging costs from measured energy.
EVAC/DC
02
Results
E = P · t
Set the inputs and run the calculation.
Context
67 kWh from the grid and 60 kWh stored in the battery give 89.55% efficiency, 7 kWh loss, and 10.45% loss.
Both measurements refer to the same charging event and system boundaries. Meter accuracy, standby consumption, and the selected measurement points affect the result.
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