PV1
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Re: Life with Chevy Bolt EV

Sat Nov 11, 2017 7:12 pm

tigger19687 wrote:I was not aware that the wipers would stop 1/2 way up and then not go down with pre-heat, TY. This is the 1st car I have with preheat thing.

The wipers don't automatically move with pre-heat. What I was saying was that if your HVAC was set to blow air on the windshield but failed to defrost the wipers, that you could manually move the wipers up so that they were on a heated part of the windshield. I don't know how effective the defroster is yet at thawing the windshield wipers as we haven't had real snow or freezing rain yet (had some flurries, but it was dry snow). I don't foresee any issues as the i-MiEV does a good job at thawing the blades.

Sorry for the confusing ramble.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

2017 Bolt EV LT in Orange with QC - 7/31/2017

Driving electric since 2-21-2013.

PV1
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Re: Life with Chevy Bolt EV

Sun Nov 12, 2017 6:58 am

I noticed something interesting this morning. Outside temperature is hovering in the high 20's low 30's and the car hasn't moved since Friday. This morning, I went out to the car and powered it up. While I was sitting in it, I noticed the power draw moved up from 1 kW to 2 kW. Looking at the energy screens, the battery conditioning segment started growing. The car was heating the battery :geek: . Not much, just enough to get it above freezing (heater only drawing about 1 kW).

GM's thermal management appears to be much more aggressive than Mitsubishi. But on the flip side, I'm not sure how I feel about battery power being used to heat the battery. I'll have to see if it does it again and if it does it while driving. It took several minutes of being on and not moving for it to start heating.

Since seeing this behavior, I've been able to verify what the three coolant tanks are for. Left-hand side tank is for electronics/motor, front passenger (right-hand) side tank is the battery, and the rear passenger side tank (tucked under the plastic trim between the hood and wiper blades) is the HVAC heater loop.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

2017 Bolt EV LT in Orange with QC - 7/31/2017

Driving electric since 2-21-2013.

tigger19687
Posts: 550
Joined: Tue Feb 10, 2015 1:19 pm
Location: Bedford/Concord MA

Re: Life with Chevy Bolt EV

Mon Nov 13, 2017 6:47 am

I too noticed the draw at 2kW but there was nothing on, no heat no nothing. It too was cold out.

So it must be to warm batteries. Not much of a draw but maybe worth it to keep plugged in over night ?
[size=85]- Linda
-2017 Chevy Bolt Premier Bright Blue
- 2014 Toyota Prius C, for the Son

NeilBlanchard
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Joined: Tue Jun 19, 2012 11:26 am
Location: Maynard, MA Eaarth
Contact: Website

Re: Life with Chevy Bolt EV

Tue Nov 14, 2017 12:31 pm

tigger19687 wrote:Neil,

How did the Bolt do with the Frost the other day ?
I am very disappointed that normal cabin warming didn't un-frost the blades as on any normal car. Including the 'i'. But I think I needed to change the settings on how the pre-conditioning comes on. Will have to see how it works on the next frost/ (shhh, snow).


I didn't drive our Bolt EV that day. My son did, and he didn't mention any issues. When I have used the defroster, it works as expected.
Sincerely, Neil

http://neilblanchard.blogspot.com/

PV1
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Re: Life with Chevy Bolt EV

Mon Nov 20, 2017 6:10 am

Something tells me the Bolt won't be a good winter car. Likewise, pre-heated for 15-20 minutes with air on the windshield, but the wipers remained frozen to the windshield. Got them free, then had issues getting them to park correctly.

1/3 of my heater power went to the battery this morning, but seemed to only run while I had cabin heat enabled while driving, so it appears that we do have some control of battery thermal management.

It was only 28 degrees this morning, too. What's going to happen when it drops into single digits?
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

2017 Bolt EV LT in Orange with QC - 7/31/2017

Driving electric since 2-21-2013.

PV1
Site Moderator
Posts: 2879
Joined: Fri Apr 27, 2012 4:22 pm
Location: Pittsburgh, PA
Contact: Website

Re: Life with Chevy Bolt EV

Thu Dec 28, 2017 6:28 am

So, now that temperatures are in the single digits, I'm finding that battery heater power has increased, but not significantly. The bigger issue is that the wipers permanently have ice blocking them in (more of it has evaporated than has been defrosted by cabin heat). This morning, it was a balmy 0 F. Preheating worked like a champ, but I found that I can't move the windshield wipers by hand like I could before. They are stiff in the servos. I don't know yet if this affects normal operation.

I wonder how much cold weather testing GM did. I know the Bolt was rushed, but they nailed everything down pretty well except for the wipers. There's nothing to thaw the trough out.
"Bear" - 2012 Diamond White Pearl ES with QC - 2/21/2013
Solar-powered since 10/10/2013

"Koorz" - 2012 Cool Silver Metallic ES with QC - 1/5/2015

2017 Bolt EV LT in Orange with QC - 7/31/2017

Driving electric since 2-21-2013.

NeilBlanchard
Posts: 347
Joined: Tue Jun 19, 2012 11:26 am
Location: Maynard, MA Eaarth
Contact: Website

Re: Life with Chevy Bolt EV

Thu Dec 28, 2017 11:13 am

So far, this is pretty similar to our e-Golf and LEAF. Since EV's don't have excess heat, we tend to not run the defroster when we don't have to, obviously. The LEAF has a deeper trough, and the e-Golf has a more closed trough.
Sincerely, Neil

http://neilblanchard.blogspot.com/

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