A. According to GMC, it’ll take about 10 minutes to restore 100 miles of range when the truck goes on sale in 2022.
Complete, marketing BS.
If the range of a Hummer is 300 miles, they are implying to stupid people it would only take 30 minutes to fully charge the battery.
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Indeed, that is an physical barrier with current battery tech. The initial charging of the battery to 25% capacity is fast. It slows down more and more as you attempt to bring it up to 100%. It’s tough herding electrons.
Those car manufactureer provided level 1 chargers can only safely pull 20 amps of 120 ac from a residential wall socket.( Many older homes have only 15 amp rated socket and wiring.
So at best power INPUT to the charger 2.5 kw and no charger is 100% efficient.
A full charge to the modest 39kwh pack will take at least 18 ours.
Much better battery life results if battery is not discharged more than 50 % .
So two scenarios are workable: drive to work using half the capacity and the car recharges during your 8 hour shift plus lunch, then drive home and plug it in again.
Or drive to work using 25% or charge, park car , drive home arriving with half discharged battery and plug in.
BIG question is how many charge discharge cycles? If 1000 expect battery replacement in 3 years or less. And there is a small but measurable loss in capacity each cycle.
Ive used LOTS of rechargeable batteries in last 45 years and the ones that had longest useful life were charged at low rates . 10 years life for batteries charged at slow rate daily versus 1 year forthose fast charged. The slow charged batteries barely warm the fast charged HOT.