Gif
Posts: 237
Joined: Mon Jun 06, 2016 12:24 pm
Location: Bottom right hand corner of Wales

DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 8:55 am

Just wondering if I've missed this somewhere as I can't recall having read it on the forum or in the manual.

So I pull into a rapid charging facility with 8% SoC and plug in an operational DC Rapid CCS charger and commence charging. 32 mins later I return to my car.

What SoC would I expect to have (approximately) ? :ugeek:

theothertom
Posts: 364
Joined: Mon Mar 20, 2017 6:08 am
Location: South Carolina

Re: DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 10:21 am

Note that the fast charger cuts off after 30 min. The SOC will depend on how large your battery is. For 2017 cars with the larger battery you'll get up around 75%.

Sardoc
Posts: 7
Joined: Sat May 20, 2017 2:05 pm

Re: DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 10:25 am

......so, with an 8% starting state of charge you should be able to get up past 80% even with 90ah battery on the 2017. More on the 60ah 2014-16.

Gif
Posts: 237
Joined: Mon Jun 06, 2016 12:24 pm
Location: Bottom right hand corner of Wales

Re: DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 10:51 am

Okay, you kinda knew there had to be a reason for me asking.

I thought the same. It's the 2017 94ah battery but I thought at 43kw minimum I would get to around the 80% mark.

I put the car on charge on a rapid last week. It got to 47%. The maths just don't compute so I queried it with the company who run the charger and send the bills (Ecotricity aka Electric Highway).

My car is working fine. It charges as it should. Had it on my 7kw charger at home, an AC 11kw charger on Sunday and I've done DC a few weeks ago from 17% to 90% in 30 mins. All the maths of those work out.

The reply came today. Apparently as my SoC was so low, in order to protect the battery, the charger reduced the power it was feeding in. This may or may not have been for the full period depending on when it decided the battery was able to take the full charge rate. This is why it only got to 47%.

Now I'm wondering if that sounds to you like the same pile of horse doodoo that it sounds like to me.

If you do the maths, it sounds like the charger was running at half power.

The reason I wrote querying it was I object to being charged the full amount for half of what I purchased.

Any comments welcome to support or shoot down their story :roll:

jadnashuanh
Posts: 5036
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 3:00 pm

I have yet to try the CCS input I have on my car, mostly because there are so few around, and I just haven't needed it to try. I guess I should check it at least once before the warranty runs out.

The charge rate will somewhat depend on how warm the battery is when you attach it to anything to recharge it. The ambient temperature can make a difference, too. If the CCS unit itself was overheated (a recent user?) or not running at full capacity (a bad module?), it wouldn't have the full output available. On some, it shares the output, and cannot give multiple ports the full output (say someone else was charging at the same time?).
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV
Soon (hopefully!) A 2021 X5 45e will replace the above

Gif
Posts: 237
Joined: Mon Jun 06, 2016 12:24 pm
Location: Bottom right hand corner of Wales

Re: DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 3:22 pm

It was a warm day and being empty after 130 miles or so, probably meant the battery was warm too. This wasn't something I had built into my charging thought process though so need to factor in earlier or longer charges for any given route potentially.

CCS was all focussed on the i3. I have a feeling it was just a bad one and I'm being strung along.

A few weeks back I'd burned through 60% of the battery on a pretty hilly drive then some motorway. Attached it to a similar Rapid and it went straight from 17% to 90% in 30 minutes without so much as a blink.

Sardoc
Posts: 7
Joined: Sat May 20, 2017 2:05 pm

Re: DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 4:56 pm

Given the information you have provided, I would conclude the same as you: an impaired EVSE .
Did you really get 130 miles out of your i3 before it hit 8%? Have you ever gotten that much range before?

theothertom
Posts: 364
Joined: Mon Mar 20, 2017 6:08 am
Location: South Carolina

Re: DC Rapid Charging - sort of a quiz question

Tue Jun 06, 2017 5:05 pm

I put my 2017 on a fast charger, starting around 8-10% and it charged up to around 75% in 30 min.

Also, the guess-o-meter said around 130 miles but I actually got around 108 before the REx came on.

Gif
Posts: 237
Joined: Mon Jun 06, 2016 12:24 pm
Location: Bottom right hand corner of Wales

Re: DC Rapid Charging - sort of a quiz question

Wed Jun 07, 2017 3:31 am

Yes, it was on A roads in warm day non stop mostly 40-60mph. I hit 117 miles with 20% remaining when I started looking for the first charger but the first two I found were occupied and the duff one was the third I found.

Towards the end of the first stretch of the journey before I shut down, I saw the equivalent of a 150 mile range for the first time.

bwilson4web
Posts: 758
Joined: Fri Apr 29, 2016 11:59 pm
Location: Huntsville, AL

Re: DC Rapid Charging - sort of a quiz question

Wed Jun 07, 2017 9:22 pm

Not a criticism as much as an observation that we don't have enough information. Key to my understanding:
  • What did the car ask for?
  • What did the EVSE reply with?
We can speculate about reasons why the car might not have requested a full charge but without metrics, we're flying blind.

Also, even a fully functioning EVSE may have received a signal from 'other sources' that limited its ability to provide a full charge. In a perfect world, we would know the voltage and current provided backed up by any 'pilot' signal to the car letting it know what the EVSE is capable of providing.

Please understand, I'm not faulting the owner or EVSE operator. Rather, without metrics, we're speculating.

Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

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