If your EV is plugged in at the wrong time, home charging can cost far more than it needs to. Overnight charging simply means using the car’s timer or a dedicated home charger to fill the battery during the cheapest hours, usually when demand is low. For most drivers, that is the biggest saving available without changing how they use the car.

Use cheap hours

The first step is not the charger but the tariff. A time-of-use tariff charges less for electricity in a set overnight window, but it can be less favourable in the daytime, so it only makes sense if most of your charging really happens at night and you do enough miles to benefit.

Once that is in place, schedule charging rather than starting it when you get home. Most EVs let you set a delayed start in the car, and many home chargers do the same. That matters because plugging in at 6pm and charging straight away can wipe out the saving, while starting in the small hours usually cuts the cost with no extra effort.

Match charge to use

The next saving comes from charging only what you need. If your weekday driving is predictable, an everyday target of around 70 to 80 per cent is often enough, and it is usually gentler on the battery than sitting at full charge night after night. Save 100 per cent for longer journeys or days when you know you need the range.

This is also where range traps affect cost. Cold weather, short trips, cabin heating and fast motorway speeds can raise consumption noticeably, so the cheapest plan in summer may be too tight in winter. If you do a long trip, finish the overnight session close to departure and pre-heat the cabin while the car is still plugged in; that keeps more battery energy for the road and can reduce the chance of needing a pricier rapid charge later.

Checklist

  • Check whether most of your charging can happen in an overnight off-peak window.
  • Use the car’s timer or charger schedule, not plug-in-and-forget.
  • Set a lower daily target unless you genuinely need a full battery.
  • If you use a standard socket regularly, use the correct lead and have the circuit checked if you are unsure.

Cheap home charging is mostly about timing and habits, not chasing tiny efficiency gains. Set the cheapest hours, choose a sensible daily limit and adjust for season and mileage, and the savings usually follow.