jsg
Posts: 28
Joined: Tue Jun 20, 2017 10:08 pm

2017 Bolt 8 vs 12 amp charge

Tue Dec 25, 2018 4:41 pm

Hi there! Happy holidays to all...

I am wondering if I should use the 8 or 12 amp setting when charging. Does one charge quicker? Does one charge the battery more fully than the other?

Thanks!
Jerry

WetEV
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Location: Near Seattle

Re: 2017 Bolt 8 vs 12 amp charge

Tue Dec 25, 2018 6:05 pm

jsg wrote:I am wondering if I should use the 8 or 12 amp setting when charging. Does one charge quicker? Does one charge the battery more fully than the other?


The 12 Amp setting will charge faster, however remember that 120V charging isn't very fast.

Both will charge the battery to the same level.

If you have a quality outlet with nothing else on the circuit, and you have never popped the breaker while charging, you can use the 12 Amp setting. When in doubt, ask an electrician.

The 8 Amp setting puts less loading on the circuit, so some other loads can be on the same circuit.

If you have old construction, or anything gets hot, or any other reason to doubt the wiring, ask an electrician.

Many owners install a 240V charging station at home to get faster charging and to avoid old wiring problems.
#49 on the LEAF 100 mile club.
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red
2014 Leaf SL Red
Can't sit in a Bolt seat, hoping for better soon.
Or perhaps a Buick version? Buick Electra 225???

BoltEV
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Joined: Thu Feb 01, 2018 5:58 am

Re: 2017 Bolt 8 vs 12 amp charge

Fri Dec 28, 2018 9:56 pm

I find the difference to be the choice between tolerable slow charging (12 amp) to intolerablely slow charging (8 amp).

JoeS
Posts: 29
Joined: Mon Jun 19, 2017 3:14 am
Location: Los Altos Hills, CA

Re: 2017 Bolt 8 vs 12 amp charge

Sun Dec 30, 2018 6:29 pm

With a car like the Bolt's huge battery capacity, charging speed simply doesn't matter unless you drive significant distances on a daily basis. For example, with the national average being under 35 miles/day, 120vac at 8A is sufficient for an overnight recharge to put back about 10kWh and meet that need.

There's a school of thought that, in winter, it is better to simply let the car slowly sip continuously on 120vac as it keeps the battery less-cold. Has anyone monitored the battery temperatures to see if this is true?

For example, I time my charging to start in the evening so that it shuts off somewhere around 70%SoC about the time I'm ready to leave home in the morning.

8A is easier on the connectors and house wiring, especially in older homes. If nothing else, I would be inclined to replace an older 120vac receptacle that is dedicated to the Bolt with a new one simply to have good springy clean contacts.

Yes, charging using 240vac or 120vac 12A is more efficient than 120vac 8A because, given that the 'overhead' power consumption is the same, spending less time charging means less power consumed from the wall to achieve the same charge level.
Last edited by JoeS on Sun Dec 30, 2018 10:12 pm, edited 1 time in total.

trevmar
Posts: 25
Joined: Sat Jan 21, 2017 8:08 pm

Re: 2017 Bolt 8 vs 12 amp charge

Sun Dec 30, 2018 7:30 pm

..........as it keeps the battery less-cold...........

Not always good, to a degree (no pun intended) charged batteries will store better 'cold' although that has to be weighed against sluggish performance when you want to actually use and discharge them.

BoltEV
Posts: 201
Joined: Thu Feb 01, 2018 5:58 am

Re: 2017 Bolt 8 vs 12 amp charge

Mon Dec 31, 2018 8:34 am

JoeS wrote:With a car like the Bolt's huge battery capacity, charging speed simply doesn't matter unless you drive significant distances on a daily basis.

From January through September 2017, I suffered through charging at 120v at my garage because I had no option (although I could use 12 amps and set my “home” preference to 12 amps so I did not have to remember to manually make that choice before turning off the car each time).

I then hired an electrician to bring 240v at 30 amps into the garage and I have never looked back.

I carry the AV TurboCord when traveling and always use the 12 amp option when I am forced to charge at 120v and that option is available to me.

I drove 180 miles to a family wedding in a resort town with only 120v available to me and having 12 amps available got my car recharged enough for the drive home without having to stop to charge on the way back.

The car was on the charger the whole weekend and I became a passenger in another car to get to events at the resort town so that charging would not be interrupted.

At 8 amps, I would have had to stop on the way home.

1953drtelco
Posts: 6
Joined: Tue Jan 01, 2019 2:22 am

Re: 2017 Bolt 8 vs 12 amp charge

Tue Jan 01, 2019 2:37 am

When I purchased my 2014 Volt I used the standard charger until my Clipper Creek Level II charger was delivered. Wired up a 220v 30 amp outlet with the help of youtube and never looked back. Now my 2019 has the option of using quick charge, but I doubt if that would be used often.

BoltEV
Posts: 201
Joined: Thu Feb 01, 2018 5:58 am

Re: 2017 Bolt 8 vs 12 amp charge

Thu Jan 03, 2019 12:26 am

1953drtelco wrote:When I purchased my 2014 Volt I used the standard charger until my Clipper Creek Level II charger was delivered. Wired up a 220v 30 amp outlet with the help of youtube and never looked back. Now my 2019 has the option of using quick charge, but I doubt if that would be used often.

Are you suggesting that the 2019 Volt has a DCFC option?

SparkE
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Location: SF Bay Area

Re: 2017 Bolt 8 vs 12 amp charge

Thu Jan 03, 2019 3:59 am

A related note - the 2019 Volt has a faster on-board charger than previous years : 7.2 kW.

https://electrek.co/2018/09/21/2019-che ... operation/

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