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Route AC over battery

Posted: Mon Jul 15, 2019 11:39 am
by DougWantsALeaf
All,

I know battery temperature regulation is a big concern for those of us from all model years.

For winter use, with the ducted heat to the rear, I am eager to see in Jan/Feb if running the heat while charging can help bring up battery temps.

But as we are in July (for those in the northern hemisphere), I wonder if there is any easy way to route the AC through those same ducts, or via other ways (like into the rear hump) which would not be too obtrusive. I am guessing we see that happening on the 2020 Leaf given the precedent with the eNV 200, but not helpful for those of use with existing cars.

I have tried running the cooling cycle a few times while plugged in to see if does anything for the battery temp, but until i get Leaf Spy back up and running, the dash gauge isn't enough to if it even can take even a couple degrees off the battery.

All of that said, at least in Chicago, on 90+ F days here , my battery has been pretty consistently at midpoint on the temp gauge. Even when sitting in the sun. As we are close to peak summer here, the lack of thermal mgmt here hasn't been a concern yet.

We have a 2 day 850 mile trip in a couple weeks, so guess that will be the better test.

Re: Route AC over battery

Posted: Mon Jul 15, 2019 1:22 pm
by LeftieBiker
Assuming that the 2018+ Leaf still has the Emergency Disconnect on that hump in the rear passenger floor, then the accepted method is to route cold air from an A/C duct into that. However, the 40kwh Leaf virtually fills the under floor space with battery modules; it is my understanding that there is no longer an air space there to use for forced air cooling. Perhaps someone would like to check...?

Re: Route AC over battery

Posted: Mon Jul 15, 2019 2:29 pm
by DougWantsALeaf
Do I invalidate any warranty by popping open that hump?

Re: Route AC over battery

Posted: Mon Jul 15, 2019 4:29 pm
by LeftieBiker
DougWantsALeaf wrote:Do I invalidate any warranty by popping open that hump?
This isn't authoritative, but I don't think so - as long as you don't actually pull the disconnect, anyway...

Re: Route AC over battery

Posted: Mon Jul 15, 2019 7:08 pm
by Oilpan4
Probably next week when it's supposed to get into the 100s during the day and not drop below mid 80s at night.
I may see 7 and 8 battery bar temperatures during the day.
I will open the battery door and run a ducted portable A/C into the window.

Re: Route AC over battery

Posted: Mon Jul 15, 2019 7:10 pm
by LeftieBiker
Oilpan4 wrote:Probably next week when it's supposed to get into the 100s during the day and not drop below mid 80s at night.
I may see 7 and 8 battery temperatures during the day.
I will open the battery door and run a ducted portable A/C into the window.
Cool! (So to speak.) Thanks.

Re: Route AC over battery

Posted: Tue Jul 16, 2019 5:13 am
by DougWantsALeaf
Before I give that lid a hard yank, any clips I need to worry about breaking?

Re: Route AC over battery

Posted: Tue Jul 16, 2019 12:14 pm
by LeftieBiker
Sorry, I don't know.

Re: Route AC over battery

Posted: Tue Jul 16, 2019 3:20 pm
by Calaveras
It seems that you are trying to make duplicate what the Kia did with th it’s battery packs. They have still replaced a few batteries from 2015-16 under warranty for degradation. It seems better than the Leaf, but not as good as liquid cooled.

Re: Route AC over battery

Posted: Tue Jul 16, 2019 3:28 pm
by LeftieBiker
Calaveras wrote:It seems that you are trying to make duplicate what the Kia did with th it’s battery packs. They have still replaced a few batteries from 2015-16 under warranty for degradation. It seems better than the Leaf, but not as good as liquid cooled.

That's pretty much it. I wouldn't expect this improvised air cooling to be nearly as effective as the Hyundai/Kia design.