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Charging rate stops at 47A?

u00mem9

Member
Jun 8, 2016
943
1,290
USA
Refresh car and HPWC set at 48A...but charge rate adjustment stops at 47A. It doesn't really make a difference, but any idea why won't it go to 48A?
 

gavine

Petrol Head turned EV Enthusiast
Apr 1, 2014
2,611
2,171
Philadelphia, PA
Same issue here. I have a theory. The on-board charger is ultimately rated by kW, not amps.....kW is volts-times-amps. The normal household voltage is 240 and at 48A that would be 11,520 watts. My house shows 245V on the charge screen so I believe the car drops the amps down to 47 to keep the kW in the 11.5 range (245 x 47 = 11,515).
 

ThisIsTrue

Re-member
Nov 29, 2016
619
893
'Western Slope' Colorado
I have a theory. The on-board charger is ultimately rated by kW, not amps....

That sounds plausible. My HPWC has a 60A breaker, and I do see 48A routinely when I charge at home, even though the setting in the car tops out at 47A:

HomeCharging.png
 

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