How much does it cost to charge an electric car?

The complete guide to the cost of charging your electric vehicle at home

Before we dive right into the facts andType 2 - 3 pin plug  figures every electric vehicle can be charged using the standard 3pin plug.  This is not a recommended method of charging your electric vehicle because the socket may not be rated for continuous high power use over extended periods and it takes a considerably longer time to charge than using a dedicated home charging point. With that in mind the cost of charging is not affected by the time it takes to charge your electric vehicle.

The energy supply to your property and the vehicles battery size will determine the overall cost of charging your electric vehicle. The energy supply is measured using kilowatts per hour (kWh).

Home EV charging is the cheapest and most convenient way to fill your EV’s battery level, but there's so many options and choices. It all may seem a little confusing at first so let's break it down into two sections.

Kilowatt per hour

Battery size

Every electric vehicle comes with a dedicated rechargeable battery, the size of the battery in each vehicle varies depending on make, model and manufacturer. The power output is measured in kWh and can easily estimate cost using this measurement.

The easiest way to calculate the average cost of charging your electric vehicle is by using this method.

  • The cost of electricity supplied to your property per kWh.
  • The battery capacity of your electric vehicle.
The average cost of electricity per kWh is currently 14p (you can find out what your electricity tariff’s unit cost is by checking your energy bill).
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How much does it cost to charge my electric vehicle?

Using the above method and energy price of 14p per hour charging we can calculate the average cost of charging the following vehicles easily.

Electric Vehicle Energy Price per kWh Battery Capacity (kWh) Cost to Fully Charge (£) Range (mi)
Tesla Model 3 Standard Range Plus 14p 50 kWh £7.00 190
Porsche Taycan 14p 93 kWh £13.02 230
Renault Zoe 14p 55 kWh £7.70 195
Tesla Model S 14p 100 kWh £14.00 310
Kia e-Niro 14p 67 kWh £9.38 230
Kia Soul 14p 67 kWh £9.38 225
Volkswagen ID.3 14p 62 kWh £8.68 215
Polestar 2 14p 78 kWh £10.92 265
Jaguar i-Pace 14p 90 kWh £12.60 225
Peugeot e-2008 14p 50 kWh £7.00 155
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How much does it really cost to charge an electric car?

Unit rate (kWh)

The unit rate is measured in kilowatt per hour (kWh) and is the common name of the unit of electricity used. Usually this is a single unit that you receive from supplier at a price. This unit can be delivered, stored and then used at a later date using batteries. When referring to the kWh it can be used as a standard delivery unit no matter if it's coming from supplier or storage.

Price overview (kWh)

The lowest price of a kWh unit of electricity in the UK is about 12 pence, but kWh prices can go as high as 23p with a zero standing charge tariff. Knowing the price of a unit of electricity is only useful if you have a way to compare it to other similar tariffs. The price of an economy 7 tariff is going to differ from the cost of single rate electricity as part of a dual fuel tariff.

Solar and wind generation can also supply you with kWh at no cost and decrease your overall price per unit from supplier, also if you attach a battery storage system to power your home during peak times you may reduce the cost charging your electric vehicle further.

Battery Size (kWh)

Every battery that powers your electric vehicle will have an energy supply per hour rating. A 100kWh battery is capable of delivering a maximum of 100 kilowatts of energy for one full hour. Depending on the energy consumption of each electric vehicle and the size of the battery can limit its Range Per Hour (RPH).

An electric vehicle driven at a moderate speed will consume on average about 15kWh-20kWh but this is to be used as a reference only. The consumption of the vehicle depends on its range, the capacity of the battery and the style of driving.

Range Per Hour (RPH)

RPH or Range Per Hour (of charging) is the standard unit of measurement used when charging your electric vehicle, hence 100 RPH is 100 miles range per hour of charging. To achieve 100 miles per hour charge you must be connected to a 50kWh rapid charger.

Charging Speed (kWh)

The time it takes to charge your electric vehicle from empty to full can vary on the type of charger you use. Most UK homes are only capable of receiving a single phase electricity supply and maximum charging rate of 7.4kW and using a dedicated charge point.

Overall charging speeds:
  • 2.3kW - 3 pin plug (Home)
  • 3.7kW slow (Home)
  • 7kW fast (Home)
  • 22kW fast (Some Homes)
  • 43-50kW rapid (Commercial)
  • 150kW rapid (Commercial)

The information provided in this article is based on averages and varies between car, charger, energy supplier and user. The guide is aimed give you key information required to estimate costs and understand abbreviations, if you would like any more information regarding electric vehicle chargers or would like an electric charger installed at your home or workplace please get in touch.

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