How is the average cost per session calculated?

We calculate the average cost per kWh over the whole charging session. 

The cost we calculate is based on:

• the electricity tariff / rate you indicated in the app
• whether that tariff / rate is variable or fixed
• whether you are using our Solar Smart Charging feature and charging your car from your solar panels

If you're on a variable rate 

Our Smart Charging algorithm works out the average cost of charging over the whole period of time when you were charging.

For example, say you charge continually from 10pm to 2am, and that you are on a tariff which costs 10p/kWh between 10pm and midnight, and 5p/kWh between midnight and 2am.

In this case, you will have charged half the time at 10p/kWh, and half the time at 5p/kWh, giving an average cost per kWh of 7.5p/kWh. 

If you're using solar energy

If you use our Solar Smart feature, we will calculate what percentage of energy is coming from your solar panels, and use this to calculate the average cost. 

For example, let's say you are solar smart charging between 2pm and 4pm, at a time when your grid electricity costs 10p per kWh. Let's say during that time your solar panels produce 50% of the energy used to charge your vehicle.

In this scenario, your average cost of charging with 50% solar power and 50% grid electricity between 2pm and 4pm is 5p per kWh.

Learn more about Solar Smart.

If you're on a flat rate 

If you have a flat rate tariff and aren't using solar energy, the average cost per kWh will always remain the same: the flat rate you have set in the app.

Keep your tariff up to date

As you can see, we rely on your tariff information being up to date in order to calculate the average cost per kWh for each session. If you have not told us what tariff you're on, or you have changed tariff recently - please add your latest tariff information in the app. You can go to Smart > Your tariff and update the tariff / rate there.