Quote:
Originally Posted by embee
In France you pay for a tariff according to what max power/current you want, the lower the cheaper. I guess modern houses tend to be higher, but it certainly wasn't uncommon back in the day for the supply to be 3kW/13A.
It is a bit of a reality check to consider what the effective equivalent "power" is for refuelling with petrol or diesel. A typical forecourt petrol pump delivery is around 30 or 40 lt/min (commercials a bit more). Petrol contains around 43MJ/kg, which is a bit over 30MJ/litre round figures. So at 35 lt/min and 30MJ/lt that's over 1000MJ/min, or 16MJ/sec (=16MW or 16,000kW)
A petrol engine might average out at around 25% thermal efficiency, so taking that into account to compare fairly with a BEV, you'd still be looking at about 4MW (4,000kW) to recharge a BEV at the same "effective" rate as refuelling a petrol car. That's never going to happen.
I don't know what the maximum realistic charge rate could be for a BEV in the future, battery/charging technology permitting, but if it ever got anywhere near that I'd be extremely surprised.
It does put charging rates into perspective. There's a lot of energy in petrol.
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If you watch a video on the Harrys Garage YT channel about the Porsche Taycan, he goes to charge it at a 'pay at pump' electric charger. I don't know the day or time of day he charges it but the cost was 10p a mile (25 miles added, at a cost of £2.50). Which is the rough equivalent cost of an ICE that does circa 50MPG. Most modern cars are not far off that in the equivalent combustion fuel cost.