Home EV charging questions, answered

The Department of Energy's method is the same: cost per mile is your electricity price times the kWh the car uses per mile. It adds that actual costs depend on when and how long you charge, and that some utilities offer cheaper time-of-use rates for charging.

25.5 mpg is the typical new gasoline vehicle in EPA's Automotive Trends Report. A more efficient gas car narrows the gap and a pickup widens it; the calculator lets you pick your own car.

The DOE gives a range of charging times from less than 20 minutes on a DC fast charger to 20 hours or more on Level 1, depending on how empty and how big the battery is, the car's built-in charger and the equipment.

A plug-in Level 2 charger needs a 240-volt outlet such as a NEMA 14-50; Lectron says a licensed electrician must install the outlet and a dedicated 240-volt circuit if you don't have one. The Lectron NEXUS was $419.99 on Lectron's site when we checked on October 25, 2026.

The Department of Energy notes most residential Level 2 chargers run at up to 30 amps and need a dedicated 40-amp circuit to meet NEC Article 625. If your panel has limited capacity, ChargePoint says a licensed electrician should pick the highest amperage it has room for; even 24 amps adds about 18 miles an hour, roughly 140 miles over 8 hours.

ChargePoint allows plug-in installs only on 40-amp and 50-amp circuits (32 or 40 amps of charging) and does not recommend a GFCI breaker with its Home Flex, because the charger has its own charging circuit interrupting device.

Both Lectron's NEXUS ($419.99) and Autel's MaxiCharger AC Elite Home 40A ($559), both on the makers' sites on October 25, 2026, plug into a 14-50; Autel's 50-amp version is hardwired.

For faster charging, a new 40- or 50-amp circuit gives 32 or 40 amps (25 or 30 miles an hour, ChargePoint's estimates); the installation cost page shows what adding one costs in your state.

Lectron's portable charger adjusts from 8 to 40 amps and comes with plugs for an ordinary outlet and a NEMA 14-50; check that any adapter you use is rated for your outlet.

The DOE adds that an electrician can tell you whether your home has enough electrical capacity, and can add circuits if it does not. EnergySage puts permits at about $50 to $800 depending on where you live.

The average home charger installation cost $2,442 in Qmerit's 2026 data published by EnergySage, before the charger itself.