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redLEAF
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Location: Chicago, IL

EVgo nrv QC display -- questions

Sun Jun 05, 2016 4:39 am

As we're getting our street repaved soon and our '12 LEAF SL w/QC (and down 1 capacity bar) won't have access to our garage L2 charger decided to activate that 'free' EZ-Charge card now (part of that settlement on the whole battery degradation issue) as it will more than cover the time I'll need it --- plus, never really had a need for the QC as we don't drive that far so felt it was time to try it as it's no cost ... anyway here is the scenario and question:

We did plenty of errands yesterday so GOM read out was 9 miles of range left, initial low battery warning flashing, just 1 battery capacity bar left. I plugged in and started charging on an EVgo nrv QC charger and the display shows I still have 25% of the battery left?? I snapped a quick photo after just a few minutes of charging and you can see after about 2 1/2 minutes it had jumped to 32%. At 100% charged of course the battery was not 100% but 9/12 charged (or about 75%) as I understand the fast charging will max at about 80% with a healthy battery as it restricts it due to heat from putting so much juice so quickly, etc. -- I did also see my battery temp increase by 1 bar as I would expect it. After it finished, it was fairly close to when I charge it at home on my L2 at 80% during the week; so the question is ... what percent capacity does the battery have left at a single capacity bar on the read out? I guess its compared to running an ICE when the gauge is on the 'empty' line (how lucky do you feel you'll make it to the next gas station) ... but 25% seems high, but then again perhaps there is some kind of logic that automatically puts a buffer in their system so it doesn't go past 80% ... I would have thought at 1 bar left that would be less than 10% (I know the bars are not linear but this seems off; 1 bar would be 8.333% if linear on a scale of 100%). I'm not going to worry about it but just seems strange ... has anyone seen this and can offer an explanation? BTW, QC charge took about 25 minutes; about what I expected; very nice and quick system and the card worked the first time --- much better than ChargePoint; of course I'd rather just get a 'free' refreshed battery but maybe if I use QC every day it will speed up the degradation --- and no, don't plan on doing that!


IMG_0334.JPG
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GerryAZ
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Location: Phoenix, AZ

Re: EVgo nrv QC display -- questions

Sun Jun 05, 2016 5:58 am

There is a lot of capacity hidden below the first low battery warning. 25% seems about right for a 2011 or 2012 with latest software updates. I never used an EVgo charger with the 2011 (because we did not have any in Phoenix until recently), but the Blink units let you select the desired charge level in 10% increments. If you select 100% and the battery is below LBW, charging will stop at about 80% SOC. If SOC is above LBW when you start charging, a setting of 100% will get to over 90% SOC. If you need a full charge and no one is waiting, you could initiate another charge session after charging stops at 80% (at your expense since the terms of the NCTC card limit duration to 30 minutes and require some time between charging sessions for free charging).

Gerry
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

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DNAinaGoodWay
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Re: EVgo nrv QC display -- questions

Sun Jun 05, 2016 5:59 am

I forget why, but the QC % readout never matched the car on the 2012 we had. If you dig around in old threads it was explained. If you're at one bar or less, you sure don't have 25%, and you should really consider LeafSpy, the only way to know exactly how much juice you have left.
'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new
@ 36 months, 34k, 270 GID, 57.49 Ahr

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wmcbrine
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Re: EVgo nrv QC display -- questions

Sun Jun 05, 2016 7:21 am

BTW, around here, that display is one I've seen on a Chargepoint station, and only on Chargepoint -- the EVgo stations have something different. I think it's connected to the manufacturer of the charger rather than the network operator.

JeffnReno
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Leaf Number: 022727
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Re: EVgo nrv QC display -- questions

Sun Jun 05, 2016 9:04 am

wmcbrine wrote:BTW, around here, that display is one I've seen on a Chargepoint station, and only on Chargepoint -- the EVgo stations have something different. I think it's connected to the manufacturer of the charger rather than the network operator.

That brings me to a question I have about Chargepoint. On their app I located a free station downtown and when I arrived it says EVgo on the units. I looked at the screen and it says Chargepoint. There was already a Ford charging and I could see by his unit screen he was getting a charge so I tried my Chargepoint card and couldn't start a charge. I didn't have time to call them but I'm now wondering if my card should have worked or if units with an EVgo logo require something different even if it says Chargepoint on the screen and appears on the Chargepoint app?
'12 Pearl White SL
Down 1 bar when bought 4/2/16
Dropped second bar 5/7/16 42720 miles
Dropped 3rd bar 6/17 51000 miles

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redLEAF
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Re: EVgo nrv QC display -- questions

Fri Jul 01, 2016 6:48 am

OK -- here's a follow up; still related to what's displayed on QC chargers versus what its actually telling you, etc. -- this time went to another NCTC station but a different mfg. (ABB) and I'm showing a display where it charged to 90% --- again, 90% of what??? As I was a bit concerned of over taxing what the battery could take (because even at 90% it was still charging) I hit stop and it released the QC connector (it 'locks' on this model). After disconnecting and turning the car on, it was definitely more than 80% but less than 100% charged, so on these models would it charge the car all the way to 100% in QC?

I was pleased to see that this unit was working as well as noticed that someone had used the CCS mode to 92% (look below the Chademo listing in the left of the photo).

This charger is in the Woodfield Mall, Schaumburg, IL in-between JC Penney and Nordstrom outside the Panda Express and Red Robin restaurants -- a bit of an odd location as its out in the parking lot fairly far away from the buildings so they definitely had to run a lot of underground cabling. So, what am I seeing at 90% ?

The battery did increase its temp in my car by one bar and this was a basic test to make sure the charger would work (my car had about 1/3 charge left); ambient outside temp about 80 F

IMG_0348.JPG


The other kind of weird thing is that before it reaches a higher state of charge, the indicator shows another graphic that shows minutes (2nd photo shows 44 minutes); what exactly is that representing --- if you were using an L1 or L2 charger??, doesn't seem to make sense --- and lastly, there is a speaker 'grill' (just above the display) so I would guess this might be for vocal instructions? Nothing came out of it so don't know.
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EVSE: 10/07/11 Schneider EVlink

wmcbrine
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Joined: Sun Aug 09, 2015 3:23 am
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Re: EVgo nrv QC display -- questions

Fri Jul 01, 2016 2:33 pm

redLEAF wrote:... and I'm showing a display where it charged to 90% --- again, 90% of what?

90% of the car's capacity. What else?

As I was a bit concerned of over taxing what the battery could take

I'm quite sure the car can manage that on its own.

Valdemar
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Re: EVgo nrv QC display -- questions

Fri Jul 01, 2016 7:11 pm

I don't pay attention the %-ages shown by the quick chargers, they don't make much sense on my 2011, it's best to use LeafSpy or if not then charge bars or even the GOM.
'11 SL, totaled
-1CB@33k/21mo, -2CB@53k/33mo, -3CB@68k/41mo, -4CB(41.5AHr)@79k/49mo, -5CB(38.85AHr)@87.5k/54mo
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cwerdna
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Re: EVgo nrv QC display -- questions

Fri Jul 01, 2016 7:45 pm

Valdemar wrote:I don't pay attention the %-ages shown by the quick chargers, they don't make much sense on my 2011, it's best to use LeafSpy or if not then charge bars or even the GOM.

FWIW, when I had a '13 w/CHAdeMO, the car's on-board SoC % display matched or was within 1% of what was on the DC FC.

I only ever used the tall Nissan-branded/Sumitomo $15K units.

'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

knightmb
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Re: EVgo nrv QC display -- questions

Fri Jul 01, 2016 8:35 pm

I've done plenty of "bottom of the capacity" testing in my '13 and 1 bar on the battery gauge is roughly 5% where on the '13 and newer models, the capacity gauge drops below 6% and then turns into --- to let you know it's just guessing afterwards :?
But really, the vehicle does know what it has. I've driven mine with LeafSpy until about 1% and then limp over to Nissan HQ, plug in the QC and it starts charging right at 1% like LeafSpy shows.

On the 2011, 2012 models, they don't have a capacity percent dash mode, but my guess is if you are down to 1 bar on the capacity, it's just below 6% capacity and when that final bar disappears (no bars), they are around the 3% capacity. That is the way it shows on the '13 anyway. Now, plugging into the QC, my only guess is that some math issues are making the QC think the remaining charge is higher than it should be and with no dash meter to check against, it can get kind of confusing to owners (hence why the '13 and newer models added that charge gauge to help make it less confusing).

I'm not sure how the vehicle communicates the charge % to the QC or if the QC is doing some calculation to guess at the remaining capacity. If anyone has a '12 SL w/QC in the Nissan HQ area, let me know, will be glad to hook up LeafSpy and the QC at Nissan HQ (free 24/7) to play around with some capacity testing.

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