The app shows how much you saved by charging at cheaper hours. This article explains how that number is calculated.
How it works
The calculation compares two amounts:
- What you would have paid if your car had charged straight away when you plugged in, at the prices of those hours.
- What you actually paid with the smart charging schedule.
The difference is your saving.
What is included
- Energy price only: the calculation uses the energy price from your tariff, for example hourly prices, time-of-use rates or a fixed rate.
- No taxes or grid fees: these are the same whenever you charge, so they are left out.
This is why your savings never match your energy invoice exactly.
For some cars, mostly plug-in hybrids, the car does not report its charging power. The charging power is then estimated, so the savings for those cars are an estimate too.
How to save more
- Use a dynamic energy tariff with hourly prices. This makes the biggest difference.
- Give smart charging a long window: plug in early and set a late ready-by time. That gives more cheap hours to choose from.
- Plug in every day, even when the battery is mostly full. Short sessions at cheap prices add up.
Note: on a fixed-price energy contract, smart charging cannot lower what you pay for energy. You can still benefit from solar charging and lower CO2 emissions.
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