High heat after charging overnight - does this sound right? - Page 2 - Jaguar I-Pace EV400 Forum
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post #11 of 19 (permalink) Old 05-04-2019, 08:57 PM
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Here's what a couple of my longer ChargePoint sessions look like (see attached). It seems the power delivery varies just a little over most of the time but ramp down over the last hour as the car approaches 100%. I gather that during that last phase the charging circuitry is doing some sort of balancing across all of the cells.

The little kick up at the end of one of them is when I had set a departure time on the car but ran a little later than expected getting away. That was the preconditioning drawing power from the charger rather than the car.
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post #12 of 19 (permalink) Old 05-05-2019, 07:41 PM
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I have the ChargePoint 25, and my cables get (moderately) warm and I definitely hear the I-Pace fan running high on occasion. I've never even physically felt, let alone measured the temperature of the quarter panels, hood, or frunk during charging, but I have felt (via warm air in the garage) that the car was giving off some heat at times during a long charge cycle.
Incidentally, my garaged car sits right next to a high efficiency, heat pump hot water heater, so that appliance feeds on the warmer air from the car and outputs cold air, actually cooling the garage (and heating my water in the process). A remarkably efficient combination - purely by accident! (I bought the hot water heater long before considering an EV). Now if I could only relocate (and fit) my pool heat pump in the garage it would really make for complementary systems!
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post #13 of 19 (permalink) Old 05-15-2019, 10:46 PM
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I finally did the test I promised a few post back and observed temperatures as the car charged. I hadn't observed the final approach to 100% before since I had been letting the car charge overnight.

Here's the readings I got with an IR thermometer. They are in line with yours OP.

Time, Garage wall, Hood, Fender, Connector, Charger Cable, Bottom of Frunk
1:14pm 78 88 87 79 78 ? 37%
3:15pm 82 90 89 95 102 101 (Forgot)
5:15pm 83 93 93 98 102 107 74%
7:15pm 86 96 95 100 103 110 89%
9:20 pm 86 96 95 100 102 110 99%
10:26pm 88 97 113 105 93 143! 100%

So when I went and check the car at the end, it was like your wife said... the fan was on full blast and there was a lot more heat. As I understand it this final step is when the car is balancing out the charge across all of the batteries in the pack. It's quite surprising how hot that gets and how long the car stayed in the 99-100% range. It turned off just as I was leaving the garage and it appeared the charge was finished.

Also for grins several days ago, I let the car charge on a DC fast charged for about 30 minutes, but going from about 35% to 88% I think it was. Much to my surprise there was no significant heat to be felt. I guess the efficiency when not using the car's built-in converter is much better.

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post #14 of 19 (permalink) Old 05-15-2019, 10:52 PM
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Thank you for posting these observations! Your interpretation sounds plausible .. still, I would check on the charger what the draw is. It should trickle off very significantly until it shuts off, I think mine got as low as 2 amps when it shut off. Drawing a lot of amps when the SoC is near 100% would indicate a problem.
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post #15 of 19 (permalink) Old 05-16-2019, 12:23 AM
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I must say it does sound like your cooling system is working harder than it should. AFAIK my cooling system barely runs while charging at L2. Only time I hear mine run is when I have been driving and immediately plug in. Cooling runs maybe 5 to 20 minutes then will be off for the duration even if several hours. This is charging at 24 amps. Hard to directly compare as my ambient temperature has been a bout 20F cooler than Austin.

If your experience is very consistent I would consider taking it in to the dealer for inspection of trouble codes, coolant levels etc.
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post #16 of 19 (permalink) Old 05-16-2019, 09:50 AM Thread Starter
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Quote:
Originally Posted by StormRune View Post
I finally did the test I promised a few post back and observed temperatures as the car charged. I hadn't observed the final approach to 100% before since I had been letting the car charge overnight.

Here's the readings I got with an IR thermometer. They are in line with yours OP.

Time, Garage wall, Hood, Fender, Connector, Charger Cable, Bottom of Frunk
1:14pm 78 88 87 79 78 ? 37%
3:15pm 82 90 89 95 102 101 (Forgot)
5:15pm 83 93 93 98 102 107 74%
7:15pm 86 96 95 100 103 110 89%
9:20 pm 86 96 95 100 102 110 99%
10:26pm 88 97 113 105 93 143! 100%

So when I went and check the car at the end, it was like your wife said... the fan was on full blast and there was a lot more heat. As I understand it this final step is when the car is balancing out the charge across all of the batteries in the pack. It's quite surprising how hot that gets and how long the car stayed in the 99-100% range. It turned off just as I was leaving the garage and it appeared the charge was finished.

Also for grins several days ago, I let the car charge on a DC fast charged for about 30 minutes, but going from about 35% to 88% I think it was. Much to my surprise there was no significant heat to be felt. I guess the efficiency when not using the car's built-in converter is much better.
Thank you for the detailed post. I've done measurements at 88% and 92% and have very similar measures, with some areas of the car reaching 110%. I have not gone back out to check that final 100% where there seems to be a need to cool all the components and push out the heat. It's good to see the data. The good news is that the chargers are not seeing thermal errors and the car is cooling the system to optimal temps.

If I could find the time, I'd like to set up a simple Arduino project with IR captures and time stamps. I'll need a smarter EVSE that can give me progress by hour as my Mustart is a simple charger.
Or perhaps use the heat for some slow cooking

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post #17 of 19 (permalink) Old 05-16-2019, 10:01 AM Thread Starter
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Originally Posted by Time2Roll View Post
I must say it does sound like your cooling system is working harder than it should. AFAIK my cooling system barely runs while charging at L2. Only time I hear mine run is when I have been driving and immediately plug in. Cooling runs maybe 5 to 20 minutes then will be off for the duration even if several hours. This is charging at 24 amps. Hard to directly compare as my ambient temperature has been a bout 20F cooler than Austin.

If your experience is very consistent I would consider taking it in to the dealer for inspection of trouble codes, coolant levels etc.
When first plugging into L2 or when first parking, the cooling system does barely run. It may come on for a few minutes and then drop off. In fact, during most of the charging the fan only comes on from time to time for a few minutes. The high heat, high fan speeds seem to happen at the end of the charge only. It may be working as designed.

Still haven't connected with the dealer to discuss.

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post #18 of 19 (permalink) Old 05-16-2019, 10:55 AM
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Originally Posted by sciencegeek View Post
Thank you for posting these observations! Your interpretation sounds plausible .. still, I would check on the charger what the draw is. It should trickle off very significantly until it shuts off, I think mine got as low as 2 amps when it shut off. Drawing a lot of amps when the SoC is near 100% would indicate a problem.
The power draw was actually tapering off during the time the heat was increasing. See the two attached screenshots showing power and times.

At the time of the 9:23 reading (coinciding with my 9:20 temperature reading) the power was at 6.6kw. Then it fell steadily off until hitting 0 at somewhere around 10:53. Given that OP had seen similar behavior, the charger chart looks reasonable, and the car's behavior seems fine... I'm not terribly concerned. For now I'm attributing this just to my lack of understanding of how charging performs.
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Last edited by StormRune; 05-16-2019 at 10:57 AM.
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post #19 of 19 (permalink) Old 05-16-2019, 11:27 AM
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The high heat during balancing makes sense to me. Since the car uses passive balancing, it dumps excess power from the cells that dont need it through resistors as heat. If a lot of the cells were dumping and only a couple were actually charging that would generate a lot of heat.
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