[p7wang]

Anyone did a comparison between both? What's the charge loss of each method? Is it like 20% cost for 120v and 10% cost for 240v?

 

[XJ12]

Anyone did a comparison between both? What's the charge loss of each method? Is it like 20% cost for 120v and 10% cost for 240v?

110V vs 240V: which is more energy efficient?

Just got my Juicebox 40Pro installed today by an electrician. Was wondering if 25 miles per hour charging is more energy "intensive" than 4 miles per hour charging...saw the temp go up to 120 F in the EVSE while it was charging. Does anybody know: If time wasn't an issue, would 110V cost less...

www.chevybolt.org

 

[NightHawk]

240v is more effficent, less loss than on 120v

 

[One1whaoo.]

On the other hand, 120v will probably never cause battery cooling, while 240v can and will, so there are compensating losses for 240v.

 

[p7wang]

Others indicate that they never had their battery conditioning turn on while charging on L2. If you're in the SW during summer, that's a different story as the ambient temp is already high.

 

[redpoint5]

I only have experience charging the Prius, but it's something like 75% efficient charging on 120v, and 85% efficient charging on 240v. The fan runs for the duration of the charge, so if it takes twice as long to charge, the fan runs twice as long...

Not sure what the Bolt does, but if it's circulating coolant, then circulating it for less time is more efficient, not to mention a slight savings in line loss running higher voltage. It's the amps that create heat, not the volts.

 

[p7wang]

Saw on a different post reference to some readings charging the Volt. So L1 loss of 14.4% and L2 loss of 12.2%. Such small difference, I guess I can just stick with L1 charging at home. I should get 55 hours of charging each week (Su-Thur 7 hr a night, Fri-Sat 10 hr a night) so 67.8KWh. That's should work just fine for me.

* copy *
Edju
05-17-2013, 12:40 PM
jashev - good question.
Earlier this year was, I part of a data logging trial for 3 months, a study done by FleetCarma. On my 2012 Volt, here's what I observed:

Miles driven: 4,863
Electric %: 100%

Total charge events: 269
Level 1 charges (120V): 78
Level 2 charges (240V): 191

Total energy (kWh): 1,242
Total charger loss (kWh): 160 (12.9%)

Level 1 energy (kWh): 385.8
Level 1 charger loss (kWh): 55.68 (14.4%)

Level 2 energy (kWh): 856
Level 2 charger loss (kWh): 104.1 (12.2%)

Efficiency between 120v and 240v Charging

I've seen a number of discussions on this. Thought that this statement from GM's Chief Engineer for Electrified Vehicles hit the spot: Efficient Charging

gm-volt.com

 

[ZoomZoom]

I only have experience charging the Prius, but it's something like 75% efficient charging on 120v, and 85% efficient charging on 240v. The fan runs for the duration of the charge, so if it takes twice as long to charge, the fan runs twice as long...

Not sure what the Bolt does, but if it's circulating coolant, then circulating it for less time is more efficient, not to mention a slight savings in line loss running higher voltage. It's the amps that create heat, not the volts.

I'm in the Midwest, outside of Milwaukee. The Bolt charges in a garage. I actually don't plug the car in right away when I come home. I let the car get to 'room temperature' before plugging it in. I have frequently been in the garage, while the car is charging and heard the AC kick in/pumps/etc etc etc. It doesn't run long, but it kicks in. L2 charging only. I charged L1 for the first 45 days, but that was 10 months ago and I don't recall.

 

[GJETSON]

Typically, in summer, per Torque Pro, the battery will be in the mid-to-high 80s F when I pull in the garage. When it has finished charging, the AC will come, the circulation pump comes on, and the battery coolant temp will start to drop until it gets down to the low 60s F to high 50s F. Over time the chilled coolant brings the battery temperature down to 70s F to low 80s F.