Jul 13, 2013 - 05:53 PM
briefly: the answer is yes, but only slightly: 90.8% efficient versus 88.8%. However, other factors need to be considered: 1) pre-conditioning charge recovery is MUCH faster when done while plugged into 240V than it is for 120V (5 minutes beyond shutoff versus 20 minutes). 2) if you need to go out again in the evening you may be able to do the trip on electricity instead of gasoline because you can pick up 10 miles range per hour charging versus only 4. 3) If you are on TOU metering for your electricity you may not be able to complete your charge on Level 1 within the cheaper rate time period, while you are certain to do so on Level 2.
for the nitty gritty on the DOE study on the VOlt charger efficiency, see the attached link. Here is the summary of the study:
The Chevrolet Volt OBCM was benchmark tested for AC to DC efficiency. Chargin with Level 2 EVSE at 208 VAC input (60Hz), the Volt onboard charger was calculated to be 91.7% efficient, operating near 3.3kW with a power factor of 0.997. Charging with Level 1 EVSE at 120V (60Hz) the Volt onboard charger was calculated to be 90.6% efficient, operating near 1.3 AC kW. Given that most level 2 EVSE are greater than 99% efficient when operating above 3.0kW (208 to 240 VAC) and Level 1 EVSE are 98% efficient when operating above 1.25 AC kW (120 VAC), the overall AC to DC charging efficiency for the CHevrolet Volt is 90.8% for Level 2 and 88.8% for Level 1."
Aug 09, 2013 - 11:11 PM
The efficency is slightly higher on 240V as opposed to 120.
I find that on 120 the electric range is lower. By as much as 3 miles (5Km)
Plus the fact that the car will charge up in 3 1/2 hours, where it takes 8 on a 12 amp 120v circuit. This means if you are doing a bunch of running around on a weekend say, there is time to plug in and pick up a quick charge. SOme weekends I will recharge 2 or 3 times during the day and have a full battery to go out in the evening.
Nov 14, 2013 - 12:53 AM