EV Charger Off-Peak Savings Calculator
Instantly estimate how much you can save by charging your electric vehicle during off-peak electricity hours. Free, accurate cost estimator for UK EV drivers.
Calculate Your Charging Savings
Enter your weekly mileage, vehicle efficiency, and electricity rates below to see exactly how much you could save annually by switching to an off-peak EV tariff.
Savings Calculator
Enter your driving and energy details
Average miles driven per week
Miles per kWh (avg: 3.0 – 4.0)
pence per kWh (avg: 24p)
pence per kWh (avg: 7p – 10p)
Estimated Savings
Based on your weekly driving and energy inputs
Potential Annual Savings Reference Chart
Estimated annual savings based on different weekly mileages, assuming an average EV efficiency of 3.5 miles/kWh, a standard rate of 24.5p/kWh, and an off-peak rate of 7.5p/kWh.
| Weekly Mileage | Annual kWh Used | Standard Annual Cost | Off-Peak Annual Cost | Annual Savings |
|---|---|---|---|---|
| 100 miles | 1,486 kWh | £364.00 | £111.45 | £252.55 |
| 150 miles | 2,229 kWh | £546.00 | £167.18 | £378.82 |
| 200 miles | 2,971 kWh | £728.00 | £222.83 | £505.17 |
| 250 miles | 3,714 kWh | £910.00 | £278.55 | £631.45 |
| 300 miles | 4,457 kWh | £1,092.00 | £334.28 | £757.72 |
EV Charging Savings FAQ
Everything you need to know about off-peak electricity, EV tariffs, and maximising your home charging savings.
Off-peak electricity refers to periods of the day, typically overnight (e.g., 12:00 AM to 6:00 AM), when overall demand on the national grid is low. Energy suppliers offer significantly reduced rates during these hours, making it the most cost-effective time to charge an electric vehicle.
To calculate your savings, determine your weekly mileage and your EV’s efficiency (miles per kWh). Divide the mileage by efficiency to get weekly kWh usage. Multiply this by your standard electricity rate to find the standard cost, and by your off-peak rate to find the off-peak cost. The difference is your weekly savings.
Yes, to access the lowest off-peak rates, you typically need to switch to a dedicated EV electricity tariff or a time-of-use tariff (like Economy 7 or specific EV smart tariffs). These tariffs offer cheaper overnight rates in exchange for potentially higher daytime rates.
No, charging off-peak does not harm the battery. In fact, charging slowly overnight using an AC home charger is generally better for long-term battery health than frequent rapid DC public charging, as it generates less heat and reduces battery degradation.