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Comment on The "standard" car charger is usually overkill—but your electrician might not know that [32:26]
DrunkenPirate@feddit.org 3 days ago
In recent test of a German suto 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/h. There are just a few brands that habe 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.
Wifimuffins@lemmy.world 3 days ago
Yes, he responds to that in the video.
twice_hatch@midwest.social 3 days ago
Watts/h
Just watts, watts is already Joules per second.
RaptorBenn@lemmy.world 3 days ago
Did that account for battery lifetime, because if not, that could offset efficiency gains as fast charging degrades batteries.
waitmarks@lemmy.world 3 days ago
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.
RaptorBenn@lemmy.world 3 days ago
Can you source that?
waitmarks@lemmy.world 3 days ago
Here is a paper on the relationship between heat and battery degradation
pubs.acs.org/doi/10.1021/acsomega.2c04093
lemming741@lemmy.world 3 days ago
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.
DrunkenPirate@feddit.org 3 days ago
I‘m not sure if fast charging degrades batteries. Just read somewhere an article stating that fast charging initially - first charge - boosts the overall capacity of the batterie due to chemical reactions that do not occur that long at anodes.
The issue with fast charging was the thermal management - it’s getting to hot. This is managed by good battery management and a different packaging of cells nowadays. I think fast charging isn’t an issue anymore. Can’t provide you a link or such, it’s what I gathered through serveral podcasts.
RaptorBenn@lemmy.world 3 days ago
If you could find any evidence to support all that, i might consider it, until then, ill roll with what i know.
DrunkenPirate@feddit.org 3 days ago
Can you source your statement that fast charging reduces lifetime?