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Re: Route AC over battery

Posted: Tue Jul 16, 2019 5:49 pm
by Oilpan4
What is the hyundai and kia design?
When I looked all I could find was details on their sub 2kwh non plug in hybrid battery pack cooling that appears to use cabin air and a big blower.
Are the larger batteries the same way?
Only info I could find was "battery cooling : air" with no further description or detail.

I should be finishing my roll about 10k btu per hour open loop ducted cooling rig tomorrow or the next day.
It's going to be so hot the next few days I may not charge the leaf and leave it sitting and drive a gas burner if the battery rig does not get completed.

Re: Route AC over battery

Posted: Tue Jul 16, 2019 7:47 pm
by DougWantsALeaf
Please upload a couple pictures when done.

Re: Route AC over battery

Posted: Tue Jul 16, 2019 10:14 pm
by LeftieBiker
What is the hyundai and kia design?
When I looked all I could find was details on their sub 2kwh non plug in hybrid battery pack cooling that appears to use cabin air and a big blower.
Are the larger batteries the same way?
Only info I could find was "battery cooling : air" with no further description or detail.
The EVs use pretty much the same system. Cabin air is blown over the battery. It has not proven extremely effective overall, but I'm sure it cools the pack significantly when used.

Re: Route AC over battery

Posted: Fri Jul 19, 2019 2:05 am
by Oilpan4
I think for now I can get away with raising the hood, charging at night and avoiding full changes.
I was expecting to see 7 or 8 temperature bars this week but I have yet to see the 7th bar this year.
The portable wheeled A/C sucks down about 8 amps of 120v so I'm good with not using it for as long as possible.
I'm sure I can't dodge all the 7 and 8 bar days for the rest of the summer with a few boring tricks

Re: Route AC over battery

Posted: Fri Jul 19, 2019 2:23 am
by cwerdna
Oilpan4 wrote:I think for now I can get away with raising the hood, charging at night and avoiding full changes.
I was expecting to see 7 or 8 temperature bars this week but I have yet to see the 7th bar this year.
The portable wheeled A/C sucks down about 8 amps of 120v so I'm good with not using it for as long as possible.
I'm sure I can't dodge all the 7 and 8 bar days for the rest of the summer with a few boring tricks
You do realize that the temp bars are crap and have huge overlapping ranges, right?

You may want to look at the actual temps reported by the sensors in Leaf Spy. It can at least tell you what difference, if any raising the hood does. (Probably almost none.) It will also help inform you as to the effectiveness of other steps.

Re: Route AC over battery

Posted: Fri Jul 19, 2019 3:10 am
by LeftieBiker
The portable wheeled A/C sucks down about 8 amps of 120v
Doesn't it have Medium and Low settings? Consumption ratings are always for the maximum draw. Given the tiny air space in there (if any) you might do fine with Low.

Re: Route AC over battery

Posted: Fri Jul 19, 2019 4:55 am
by Oilpan4
That is the low setting, normally don't run it on high. This A/C runs a single speed compressor and appears to have a fixed orifice.
This A/C runs open loop and I would need colder air rather than higher volume of slightly warmer air. Turning to the highest setting makes it act more like a fan that blows slightly air conditioned air.

I have leaf spy but don't leave it plugged in all the time. That 6th temperature bar does have a pretty huge range it can cover.
But I would say the upper range of the 6th temperature bar is acceptable not ideal, but 7 is putting you on notice, 8 is about the bottom of the danger zone, 9 and up you hate your battery.
First time I see the 7th temperature bar and as it flip flops between 6 and 7 bars my leaf spy blue tooth dongle will be going in.

Charged to 11 bars soc last night, but tomorrow it's going to be hot and I will have to do some day time charging.

Re: Route AC over battery

Posted: Fri Jul 19, 2019 12:48 pm
by LeftieBiker
But I would say the upper range of the 6th temperature bar is acceptable not ideal, but 7 is putting you on notice, 8 is about the bottom of the danger zone, 9 and up you hate your battery.
That's pretty much the case.

Re: Route AC over battery

Posted: Fri Jul 19, 2019 1:15 pm
by DougWantsALeaf
I am still very interested to hear about the results of the AC routing test.

Re: Route AC over battery

Posted: Sat Jul 20, 2019 6:27 am
by Oilpan4
I have 4 versions.
The control. Just plug it in. Did that last summer, saw 8 bars a few times, didn't have leaf spy.
Version 0, almost as simple as the control. Easy stuff any one can do, open the hood, charging at night, avoiding full charges.
Version 1 is simply remove the battery cover, but leave the fuse cover in place and stick a duct in the window through a scrap 2 inch thick construction foam window shaped cut out. This will definitely cool the car off some, maybe the battery too. A little of both would be ideal.

Version 1.1 now the ducting is longer and goes all the way up to the battery cover on the floor.
Almost all of the cool air ends up on the battery case.

Version 2, the secret weapon. insulated and climate controlled garage. All the insulation is bought, half of its installed, The coal furnace is in the garage and heats like summoning a portal to hell. It will help keep the garage warm in winter and I have a 2 ton split heat pump that I'm not using right now, was going to put it in my new rental but I think I would rather it be in my garage.
Only plan on getting the garage insulated by winter, the heatpump going for next summer.

Version 3. Crack open the battery repack the cells, add some heater pads, punch some holes in the battery for ducted forced air cooling, spray foam and asphalt coat the battery case. Probably summer 2021.
By 2021 I doubt I will be the first to do something like this.