tdiguy
Posts: 12
Joined: Fri Dec 25, 2020 2:24 pm

Should i be concerned with battery degradation?

Thu Jan 14, 2021 1:15 am

So, I recently bought a 2017 chevy bolt. I forget the miles but its under 30k miles. So i figured it would be gently used being a one owner car and such. I somewhat assumed the original owner got the recall notice and decided to bail ( since the recall was not corrected when i bought it ). I never saw the car at full charge until after the recall, because honestly reading a paper saying that the car might catch fire if fully charged was enough for me to ensure the car was never fully charged. Anyway, I now have a level 2 setup to charge the car fully overnight ( or to 90ish percent ) but the range estimator on my car never is above 180.
Should i look into having a dealership examine the battery on this or is this normal ish range for the car?
I also have not driven the car until the battery is almost flat to test the truth of the range estimator.

theothertom
Posts: 146
Joined: Wed Sep 19, 2018 4:13 pm

Re: Should i be concerned with battery degradation?

Thu Jan 14, 2021 1:35 pm

The GOM is just that...a guess-o-meter. Range is estimated (estimated!) based on how the car was previously driven. Your real range depends on battery temp, driving speed, tire pressure, etc. Typically it's lower in winter and higher in summer. What is your average mile/kWh rating over , say, 100 miles? Multiply that by 90% of 60 and you'll get your approximate range.

tdiguy
Posts: 12
Joined: Fri Dec 25, 2020 2:24 pm

Re: Should i be concerned with battery degradation?

Thu Jan 14, 2021 10:21 pm

theothertom wrote:The GOM is just that...a guess-o-meter. Range is estimated (estimated!) based on how the car was previously driven. Your real range depends on battery temp, driving speed, tire pressure, etc. Typically it's lower in winter and higher in summer. What is your average mile/kWh rating over , say, 100 miles? Multiply that by 90% of 60 and you'll get your approximate range.

Todays round trip to work was 45.3 miles and 14.1 kwh used which includes creature comforts. One of the graphs shows almost 4 miles per kw the efficiency score i am seeing is -8 biggest hits are on climate settings and outside temp. Honestly as much as i want to be efficient i like being comfy its freezing around here right now lol.

theothertom
Posts: 146
Joined: Wed Sep 19, 2018 4:13 pm

Re: Should i be concerned with battery degradation?

Thu Jan 14, 2021 11:14 pm

tdiguy wrote:Todays round trip to work was 45.3 miles and 14.1 kwh used which includes creature comforts. One of the graphs shows almost 4 miles per kw the efficiency score i am seeing is -8 biggest hits are on climate settings and outside temp. Honestly as much as i want to be efficient i like being comfy its freezing around here right now lol.

That works out to be around 3.2 miles/kWh. Given a 60kWh battery and 90% charge, that would calculate to
60 x 0.9 x 3.2 = 173 mile range, which is about what you reported. So I don't think you have battery degradation.
I don't blame you for using creature comforts on your commute. If you have extra range, use it.

tdiguy
Posts: 12
Joined: Fri Dec 25, 2020 2:24 pm

Re: Should i be concerned with battery degradation?

Thu Jan 14, 2021 11:26 pm

So I assume this sort of range under these conditions is normal. I had hoped it would still be closer to 200 miles for range. But from what I understand this software fix for the battery is temporary so I guess that might change things at some point.

theothertom
Posts: 146
Joined: Wed Sep 19, 2018 4:13 pm

Re: Should i be concerned with battery degradation?

Fri Jan 15, 2021 2:18 pm

3.2 miles/kWh is pretty good in winter, especially with the heat on. You're fine.

If you can plug in to charge at home (220V), it will help your range to precondition before you leave. This will turn on the battery heater and make your drive more efficient. It also means you'll leave with a warm car and won't have to use your heat as much.

PackardV8
Posts: 138
Joined: Mon Jun 12, 2017 2:39 pm

Re: Should i be concerned with battery degradation?

Fri Jan 15, 2021 5:19 pm

FWIW, we always charge at Hilltop Reserve and in the dead of winter we usually precondition, then run the HVAC at 73 degrees, use the heated seats and steering wheel, the GOM is seldom more than 140 miles. Fortunately, that's plenty for our use.

jack vines
My vehicles
2017 Bolt Premier Cajun Red
2011 Saab 9-4X
2005 Saab 9-5
1998 Saab 9000 Aero
2004 Ford F250 6.0 Turbo Diesel
1963 Studebaker Avanti
1956 Studebaker Hawk custom with a supercharged Packard V8
1955 Studebaker custom pickup with a Packard V8

tdiguy
Posts: 12
Joined: Fri Dec 25, 2020 2:24 pm

Re: Should i be concerned with battery degradation?

Fri Jan 15, 2021 11:50 pm

Thank you guys for the input. I had hoped the range to be a bit more honestly but it sounds like the car is doing pretty good for winter conditions and such.
Thankfully my commute to work is actually the longest drive I typically do and there is plenty of range for that.
The family vacation might be more challenging with a one way distance of about 80 miles.

theothertom
Posts: 146
Joined: Wed Sep 19, 2018 4:13 pm

Re: Should i be concerned with battery degradation?

Sat Jan 16, 2021 1:08 am

80 miles is no problem. If you find yourself low on range, just slow down. Speed really eats range.

GetOffYourGas
Posts: 1174
Joined: Tue Oct 20, 2015 5:25 pm
Location: Syracuse, NY

Re: Should i be concerned with battery degradation?

Thu Jan 21, 2021 1:50 pm

80 miles should be no problem. However, are you taking that trip in the winter or just the summer? Do you have an outlet to plug into when you arrive? If this is a winter trip with nowhere to charge at your destination, make sure there are public chargers somewhere along your route.
~Brian

EV Fleet:
2011 Torqeedo Travel 1003 electric outboard on a 22' sailboat
2012 Leaf SV (traded for Bolt)
2015 C-Max Energi (302A package)
2017 Bolt Premier
2021 Mini Cooper SE Signature+

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