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gbarry42
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Joined: Mon Jan 10, 2011 5:48 pm
Delivery Date: 06 May 2011
Location: Moonlight Beach

What if the Blink gets stuck charging?

Fri Jun 10, 2011 12:07 pm

What if the Blink gets stuck charging? I know the immediate follow-on question is, "Can the Blink really get stuck?"

Last night, the Blink was in a typical "behaving badly" mode, where you couldn't connect to it via the network. It was charging the car at the time. I have read somewhere, and I couldn't find the thread, that if you tried to go to "settings", it would hang at that point. I saw this for myself. My recollection about the discussion was, that it would recover after the charging was done. But I was kinda concerned that it might not come out of charge mode. When I checked subsequently, the screen had turned off. Tapping it brought it back on, but it was still "processing". Well, I figured, since the screen saver was working, and that's like the most difficult bit of programming Blink has done to date, :lol: that probably the UI was stuck but not the rest of the functions in the box. So, I let it run.

I got a "charge complete" message from the car at 4 AM. When I checked on the Blink, it was still in the same state as before. Not responding to the network, screen saver operation, sitting at "processing", and, as a bonus feature, it was pretending to charge (now showing 8-1/2 hours of L2 so far :) ). I know there is a script with a good imagination in there, although I didn't expect the screen on the box to be dumb as the one it sends the browser. I unplugged the car and plugged it back in. It tried to charge for about 2 minutes and terminated when it found it was already charged. So, when the car told it to quit, it did. Clearly in this case, the "important part" of the charging algorithm was still operational. I suspect that the actual implementation of the J-1772 parts are done on a board that doesn't really care what the rest of the box does.

But my question is, if the AC supply were not cut off for some reason, can the car stop charging anyway? It takes some serious hardware to interrupt 3-4 kW of power supply (hence the loud "thunk" inside the box). So I'm not sure if the car could "refuse" it.

Happily the evidence is in favor of the EVSE not doing this, but that isn't the question. And it is a serious safety concern, at least from the battery's standpoint.
And there goes the first capacity bar! At 24,000 mi on 9/9/2013.
Second bar at 30,500 mi on 2/7/2015.

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LEAFer
Posts: 2647
Joined: Mon May 24, 2010 10:10 am
Delivery Date: 19 Jan 2011
Leaf Number: 000215
Location: Sacramento Area

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 12:39 pm

gbarry42 wrote:But my question is, if the AC supply were not cut off for some reason, can the car stop charging anyway? It takes some serious hardware to interrupt 3-4 kW of power supply (hence the loud "thunk" inside the box). So I'm not sure if the car could "refuse" it.
Yes, the car can indeed "refuse" it. And it won't "expose" the battery to it.

The Blink might keep the contactor closed, meaning the J-plug is still energized, which is *NOT* a good thing and could cause arcing when you physically unplug it. The J-plug (after removing it from the car) may continue to be energized, which again is not a good thing, but it's relatively safe, unless you are in very wet environment (think puddle) or mess with the plug with "tiny instruments".

If you are aware of the fact that the Blink did not de-energize the plug, you might want to unplug the Blink (or trip the circuit breaker in the panel/sub-panel) before unplugging from the car or plugging it back in.
2011 Silver SL+QC [Mfg: 11/2010] 36mo/15k LEASE
06Jun2013 Status [28.5 months][34,173 miles][11 bars]
Lost CapacityBar 6/6/13 @34,173 miles while in LEAF Battery Monitor: 83.41%, 71.4F (avg); cool overnight;

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DeaneG
Posts: 1110
Joined: Tue May 04, 2010 9:20 pm
Delivery Date: 01 Apr 2011
Leaf Number: 594
Location: Cupertino, CA

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 2:11 pm

My Blink has frozen a couple of times this week after charging. Once with a permablack screen, then a day or so later stuck on "Processing...". Unplugged it to reboot both times.
White SL w/L3, 3kWDC Solar PV

Herm
Posts: 3765
Joined: Sun May 23, 2010 3:08 pm
Delivery Date: 29 Aug 2012
Location: Timbuktu, Mali

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 2:39 pm

Piece of c***, this is what happens when you needlessly overcomplicate an extension cord.

smkettner
Posts: 7380
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 3:09 pm

EVSE only offers power. Leaf will not charge beyond 80% or 100% as you have designated.
I think I am OK at this point to not be part of the EV Project.
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
RAV4 traded in for I-Pace Dec 2018

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DeaneG
Posts: 1110
Joined: Tue May 04, 2010 9:20 pm
Delivery Date: 01 Apr 2011
Leaf Number: 594
Location: Cupertino, CA

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 3:38 pm

Herm wrote:Piece of c***, this is what happens when you needlessly overcomplicate an extension cord.
I like to think of it as overspecified and underdeveloped.

OTOH, I was going to buy a Leviton EVR-160, where is that?
White SL w/L3, 3kWDC Solar PV

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davewill
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Joined: Thu Mar 17, 2011 6:04 pm
Location: San Diego, CA, US

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 5:39 pm

LEAFer wrote: If you are aware of the fact that the Blink did not de-energize the plug, you might want to unplug the Blink (or trip the circuit breaker in the panel/sub-panel) before unplugging from the car or plugging it back in.
Definitely the breaker. All the arcing concerns apply to the wall plug in spades. I do know from the mod thread that the EVSE function is handled by a satellite board and processor, so I doubt the turn off of the contactors would fail, even if the screen is dead...but better safe than sorry.

BTW gbarry, if you hear the relays clunk when you kill the breaker, you'll know you were right.
2014 Rav4 EV, Blizzard Pearl White
2011 LEAF SL w/QC, Blue Ocean, returned at end of lease

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gbarry42
Posts: 888
Joined: Mon Jan 10, 2011 5:48 pm
Delivery Date: 06 May 2011
Location: Moonlight Beach

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 6:08 pm

Well, if I can guide this thing back on topic...in my case it was pretty apparent that my charging had stopped. I suppose I could have looked at the blue lights in the car if I had thought about it. So there's never been an issue regarding stopping the thing while it is live. So all that speculation is...speculation.

What I want to know is, in a theoretical "stuck EVSE" scenario, how can the car disconnect itself? Something like 600 volt F.E.T.s, or maybe all those little clunkity-clunk relays under the floor. I guess I wanna hear from Gary or Phil (or Tony, who's had his fingers in everything :)) on this.
And there goes the first capacity bar! At 24,000 mi on 9/9/2013.
Second bar at 30,500 mi on 2/7/2015.

GroundLoop
Posts: 1725
Joined: Mon Sep 13, 2010 9:31 pm

Re: What if the Blink gets stuck charging?

Fri Jun 10, 2011 9:05 pm

It is good and NORMAL for the Car to disconnect itself.

This happens at every end-of-charge.
The car is, after all, in charge of charging. The EVSE is just an extension cord with a fancy plug.

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