HUB 04 · Charging Costs
GMC Hummer EV: Home Charging Time and Cost
The one EV where a standard 48-amp charger is genuinely a bottleneck. Here is what 19.2 kW charging actually requires.
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The GMC Hummer EV is the exception that proves the rule. Almost every EV tops out at 48 amps of home charging, but the Hummer's onboard charger accepts up to 19.2 kW - about 80 amps - and on its enormous ~200 kWh (Edition 1) battery, that extra speed genuinely earns its keep. It is the one car where a standard 48-amp charger is a real bottleneck.
Why 48 amps is not enough here
At the usual 48 amps (11.5 kW), the Hummer's huge pack takes the better part of a full day to refill from low - fine if you plug in nightly and never run it down, slow if you don't. To use the full 19.2 kW you need an 80-amp charger on a 100-amp circuit, which is a serious electrical install and, on many panels, a panel-capacity question. That cuts a low-to-full charge to roughly 11 hours - still an overnight job, just one that actually fits.
Run it for your car
Cost-to-charge calculator
Put in your electricity rate, your battery size and your car's efficiency. The math is the same one shown above, with a 10% charging loss included so the number is realistic.
- $8.09
- A 10% to 80% charge
- $11.56
- A full (empty to 100%) charge
- $0.05
- Cost per mile
- $5.08
- Cost per 100 miles
Estimate only. Actual cost depends on your exact utility rate (including any time-of-use pricing and fees), your car's real efficiency, temperature, and charging losses. Check your electric bill for your true rate.
What most owners actually do
Two honest paths. If you drive it hard and drain the pack, spring for the 80-amp circuit and a charger that supports 19.2 kW - the Hummer is the one EV that rewards it. If you top up nightly from a partial charge, a normal 48-amp charger keeps up fine and costs far less to install. Use our amperage guide to decide. The Hummer uses a J1772 AC port, so any Level 2 charger fits.
Questions
Frequently asked
How many amps does a GMC Hummer EV need at home?
The Hummer accepts up to 19.2 kW - about 80 amps - which needs an 80-amp charger on a 100-amp circuit. That is unusual; almost every other EV caps at 48 amps. A standard 48-amp charger still works, just slower on the Hummer's very large battery.
Is a 48-amp charger enough for a Hummer EV?
It works, but it is the one EV where 48 amps is a real limit: the ~200 kWh pack takes most of a day to refill from low at 48 amps. If you regularly run it down, an 80-amp circuit and a 19.2 kW-capable charger roughly halves that. If you top up nightly, 48 amps is fine.
Keep reading
Related
Receipts
Sources
- US EIA - average price of electricity (residential rates)
- US DOE / fueleconomy.gov - EV charging basics
- US DOE AFDC - charging at home
We do not run a testing lab, and we do not pretend to. Where a measured number came from someone else's lab, we name them and link them. Where we could not verify something, we say so on the page rather than quietly leaving it out. Read our full method.