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this post was submitted on 16 Jun 2025
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In recent test of a German auto club they found out that it‘s cheaper/ more effective to charger faster. You loose a lot of energy if you load slow over hours.
This energy is taken by the electricity of the car. So, while charging the car is on and takes some Watts. There are just a few brands that have decoupled the charger circuit from the overall electric circuit of the car.
Can’t find the article now, but I think charging a PHEV through a standard power plug had about 20% energy lost. It was clearly visible that a charger is a good choice.
Edit: link https://www-adac-de.translate.goog/rund-ums-fahrzeug/elektromobilitaet/laden/ladeverluste-elektroauto-studie/?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
You‘ll loose
Did that account for battery lifetime, because if not, that could offset efficiency gains as fast charging degrades batteries.
Any AC load you can throw at an EV is effectively “slow charging”. My car supports a maximum of 9.6kw from an AC charger, but up to 150kw from DC fast chargers. Even with the fast charging, its not like a phone, it has active thermal management which will cool the battery and slow down the charging if it gets too hot. phones don’t really have that and is mainly why they degrade faster if quick charged.
It's a neat conversion for EV charging. 7kw x 2.5 miles per kwh is 17.5 mph. Most EV onboard chargers top out at 11kw, 27.5 miles per hour. So from the battery's perspective, 22kw is it's normal discharge rate at 60mph.