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 Post subject: Why only 9kW charging rate on 9.6kW charger?
PostPosted: Sat Jan 06, 2018 7:41 pm 
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Joined: Sat Jan 06, 2018 6:37 pm
Posts: 1
Location: USA
I’m using a 240V 40A (9.6kW) charger I bought from OpenEVSE in December 2017 and it always charges my car at 9.0kW instead of the 9.6kW the car and this charger are rated for. I already verified the charger’s settings are not the bottle neck and my garage temperature is about 10°C/50°F. I have heard that an EV’s computer will negotiate a lower charging rate when the battery is too cold but this isn’t extremely cold weather and the 9.0kW number has never changed over varying temperatures and multiple charging cycles. What are other people seeing for maximum kW of charging?

OpenEVSE Advanced Charger:
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NEMA 14-50 outlet:
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One meter of 4.1mm thick (6 gauge) copper wire from outlet to main house electrical panel.
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2014 B250e:
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 Post subject: Re: Why only 9kW charging rate on 9.6kW charger?
PostPosted: Sat Jan 06, 2018 10:17 pm 
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Joined: Mon Jul 21, 2014 5:26 pm
Posts: 317
I charge my B250E at 40A and 245VAC with a DIY OpenEVSE. It has a Barbouri ver 4.2 board. I have no problem charging at 40A with a Quick Charge Power J1772 cable. I do not use the internal meter since it is not as accurate as my external meter. I only use the internal meter on my never used carry along EVSE. So far it is just along for the ride. I do not like the fact that the voltage is fixed and not measured. My external meter gives me volts, current, watts, and watt hours.

I also used it at 32A until I changed the cable. I had a 24Ft 32A cable for my eGolf and I used it for a while.

Every version uses the same firmware so it may just be measurement error. I currently use firmware ver 3.11.4 which when I last looked was the production version. In any event it works for me.

_________________
2014 Cirrus White B Class (Totaled)
2016 Urano Gray eGolf
I loved the VW but it was too hard to get into for my aged body.
I am back to another 2017 Cirrus White B250E
It is around $75 more and I like it!


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