Posts: 1092
Joined: Thu Dec 11, 2014 9:12 am

Re: Charging speed only charges at 3.9kw

Tue Oct 20, 2020 3:15 pm


The dealer needs to run their standard battery diagnostics plus check the charging rates so plan to bring the car in half charged. This will check the battery and the actual charging rates.

For me, the software gliche was switching to a lower charging rate automatically for some unknown reason. The service advisor said I had switched it on the dash. I replied that I had no idea where the menu was so I did NOT down throttle the setting.

Separately, I had seen a post where the charging apparatus on the car was compromised. Also, we have seen some rare cases that the inverter, etc was damaged by leaking coolant.

These are all things that MB is aware of, even if your local MB shop had not.
Jeff in NYC
MB '06 E500W; MB '81 380SL
Retired: MB '17 B250e; MB '14 Be

Posts: 6
Joined: Fri Oct 16, 2020 2:08 am

Re: Charging speed only charges at 3.9kw

Wed Oct 21, 2020 6:47 pm

Hi JeffRay

Many thanks for your advice, really appreciate it at least i can tell them where they need to look, I'm sure they won't have as much knowledge as you.

Its booked for next Tuesday and I shall definitely report back on this forum (I prey with good results).

Once again thank you soo much for taking the time to help me.

Posts: 6
Joined: Thu Sep 05, 2019 9:00 am

Re: Charging speed only charges at 3.9kw

Wed Nov 04, 2020 2:05 pm

my guess is that it could be that your charger is 1 phase 32 amps. The car charges with 3 phases at 16 amps each, and this gives around 10kW. If you only have one phase it will charge at 1/3 of that.

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