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How much does it cost to charge an EV at home?

Charging at home is far cheaper than the public network — but the number that actually matters comes down to your tariff. Here’s how to work out yours, and why an EV tariff is the big lever.

• The simple maths. A full charge ≈ your battery size (kWh) × your unit rate (p/kWh). Divide by your range and you’ve got a cost per mile — usually a small fraction of petrol.
• Your tariff dominates everything. The same charge can cost wildly different amounts: a dedicated overnight EV rate can be a fraction of the standard rate. Charge while you sleep and the cost tumbles.
• The EV-tariff catch. Those cheap night rates usually come with dearer daytime units — a great deal if most of your charging (and ideally other heavy use) happens overnight, a poor one if it doesn’t. Same logic as Economy 7 →
• How to know for sure. It depends on your real charging pattern, not an average. The only true answer comes from your own half-hourly usage. Choosing a tariff →

Connect your meter and Joulely prices the EV and time-of-use tariffs against your real usage — so you see the genuine cost (and the genuine saving) for your home, not a guess.