Formula and example
How it is calculated
Battery energy = capacity × (target − start)/100; grid energy = battery energy / efficiency, with efficiency as a decimal
Worked example
Charging a 60 kWh battery from 20% to 80% stores 36 kWh. At 90% efficiency, 40 kWh is drawn from the grid.
Things to check
- The entered average charging power is assumed constant. Charging limits, temperature and pauses may increase the duration.
- Use one currency consistently. Examples use euros; the calculation works with any currency.