We charge our EV6 at home and for the last week it keeps saying “charge interrupted” and stops charging. To restart the charger, we are having to unplug and plug 5 or 6 times to get a full charge.
That is the same threshold I found while searching through the local utility specifications, so thank you for providing confirmation that I didn't misunderstand.The voltage tolerance in the US is ±5%. 252v is right at the edge of what's permissible for 240v service, and if that's what you're getting at the EVSE it might be slightly higher at the meter. You should check with your electric utility and tell them to check for an overvoltage. If it's too high, they're required to fix it.
Your portable EVSE might be the part that's overly sensitive to over-voltage. Although the EVSE doesn't really do anything other than connect the car to the AC and signal the car as to the maximum current it's allowed to draw, most decent EVSEs have several sensors for the incoming AC and cut the power if anything is out of range, in order to protect the car. The portable may be just a bit more sensitive than the Juicebox.As an update to my last post, I finally got my Juicebox 40 and mounted it on the wall, plugged in to a 50A 14-50P outlet on a 50A breaker.
Charging works correctly, pulling 39.6A at 242V consistently for the past week.
No conclusion as to why it works with the Juicebox and not with the portable Level 2 charger that I was using before, but I'm not about to start looking for problems as long as it is working correctly now.
Yes - what I forgot to mention was this issue only started having Monday and I've had it hardwired on a 60A breaker and working for almost 2 months now. My issue is that the car has suddenly started reporting charging interrupted and I can't figure out if its the car or the EVSE.I assume ChargePoint walked you through the EVSE setup: Since you're getting the full 11.5kW speed, it needs to be hardwired on a circuit with a 60 amp breaker. If the circuit is a lower amperage, the amperage setting on the ChargePoint needs to be lowered.
The charge rate is set by amps, not by watts.I also noticed that if I remove and re-add the charger to my account, the first couple charges are at 11.39/11.4Khw and subsequent day charges are at 11.1/2/3 so that feels weird to me as well.
Yeah that explanation makes complete sense, thanks! It seems like this is happening when the charger is running on 48A and doesn’t seem to happen on 40A. Seems like the EV can’t handle charging at 48A or the EVSE can’t handle putting it out.The charge rate is set by amps, not by watts.
The car supports 48 amp charging. If you have a perfect utility service with no voltage loss, you'll get about 240v.
240 * 48 --> 11,520w (11.5kw).
It's common for voltage to sag a little during the day. Say it goes down to 230v:
230 * 48 --> 11,040w (11.0kw).
I have PG&E for an electric company. They have rules which say they'll keep the voltage between 228v and 252v under normal conditions -- and even let it drop to 220v in emergencies (say to help prevent a blackout).
To sum up: it's expected that you'll see the kw meter change.
(Edit to add: heat also increases wire resistance, which can drop the voltage. But to really notice this effect with relatively short wires, the wires need to get hot enough where they will burn you upon contact. If it's "warm to the touch" then you're fine.
But that said, maybe something inside the box is getting really hot. That could cause glitches in the hardware, which could cause the issues you're seeing. But who knows what's actually happening? )
I thought about that too, but why did it work for almost 2 months without issue? Maybe the power company pushes more voltage in the summer due to increased energy use and it’s just enough to throw off the EV?Someone else mentioned that their house voltage was at 252v, right at the 5% tolerance for 240v. He was having the same "charging interrupted".