What EV Charger Do You Need for a 2025 GMC Sierra EV?
Buying a hundred amp home charging unit for your GMC Sierra EV wastes money because the truck maxes out at 80 amps. You need an 80 amp Level 2 setup to pull the 19.2 kilowatts the onboard charger accepts. Check your truck port before buying anything since this year falls in the NACS transition and ships with a J1772 adapter.
The numbers
| Maximum AC charging rate | 19.2 kW (80 A) |
|---|---|
| Charger size to buy | 80 A |
| Circuit breaker required | 100 A |
| Outlet / connection | hardwired only |
| Charge port | J1772 |
| Full charge on Level 2 | about 10.6 hours |
| Range added per hour (Level 2) | about 37 miles |
| Full charge on a 120 V outlet | about 142 hours |
| Range added per hour (120 V) | about 2.8 miles |
| EPA rated range | 390 miles |
| Energy for a full charge | about 204.2 kWh at the wall |
Why 80 amps and not more
The battery holds 204.2 kilowatt hours. Feeding that pack takes serious power. Pumping juice at 80 amps gets you a full charge in 10.6 hours while putting 37 miles of range into the pack every hour. The EPA test pegs the time at 11.5 hours because that test cycle does not run at the peak AC rate the whole time. Buying a smaller 48 amp or 50 amp charger works fine if you want to spend less, but your recharge times will drag out.
What the install involves
Hardwiring is mandatory for this setup. You cannot plug an 80 amp load into a wall socket. Have a licensed electrician run a 100 amp circuit and land the heavy wires directly on a dedicated breaker in your panel. Ask them to verify your main electrical panel has spare capacity for that massive load before they pull the cable.
Chargers that match this car
The first unit matches your car's full 80 A. The others are slightly slower but cost less.
One of the few home units that can feed an 80 A car. Needs a 100 A circuit.
Adjustable from 16 A to 50 A in the app, which helps if your panel is tight.
Energy monitoring built in. Hardwire it for the full 48 A.
Worth having as well
Common questions
- What happens if I plug into a standard wall outlet?
- You will get Level 1 charging at 2.8 miles of range per hour. A full recharge from empty takes 142 hours using a normal household plug.
- Can I use older Tesla destination chargers?
- Yes, if you use a compatible adapter like the Lectron Tesla to J1772 unit rated for 80 amps. It bridges the hardware gap.
- Why does the EPA charge time differ from the manufacturer specs?
- The EPA testing protocol does not run continuously at the vehicle peak AC rate. Real world charging at the full 80 amps hits the 10.6 hour mark.
- Do I need a J1772 extension cable?
- Only if your charger cable cannot reach the charge port on the truck. Measure your garage layout carefully before ordering extra parts.
Other vehicles
Charging times derived from EPA data for the 2025 GMC Sierra EV. Electrical requirements follow NEC 625.41, which sizes a circuit at 125% of a continuous load. Always have a licensed electrician verify your panel.