Question 1

How accurate is this tariff savings calculator?

Accepted Answer

This tool is highly accurate for comparing the specific tariffs included. It calculates your total annual electricity consumption and then applies the different rates (standard vs. smart tariff peak/off-peak) to determine the precise cost difference based on your inputs.

Question 2

What are the main assumptions used in the calculation?

Accepted Answer

The calculator's primary assumption is your 'Off-Peak Charging' percentage. The savings are directly proportional to how much of your EV charging you can shift to the cheaper off-peak hours. The pre-defined tariff rates are based on publicly available data but can change, so you should always verify with the provider.

Question 3

What is a smart EV tariff?

Accepted Answer

A smart EV tariff, like Octopus Go or EDF EV, offers super cheap electricity rates during specific off-peak hours (usually overnight). This is designed to encourage EV owners to charge their cars when demand on the grid is low, passing on significant savings. A smart charger is typically required to automate this process.

Question 4

Are there other costs involved?

Accepted Answer

Yes. To use a smart tariff, you typically need a smart meter installed in your home. Some tariffs may also have different standing charges compared to a standard rate. This calculator focuses purely on the savings from the electricity unit cost (per kWh), which is the most significant factor.

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