220v Charging More Efficient?

it`s kinda hard to repeat the same charging senareo every time so the kwh is not going to be the same every time

M729 ? 2

It`s a 500 watt spread

M729 ? 2

 

220 is supposed to be more efficient, but i'm confused, you're comparing charging from empty to charging from 0.6 miles left?
discharge battery to the same level (and verify via scan gauge or torque) and then compare

 

i have read that 240v is more efficient. since i got my 240v charger, i hadn't charged to full at work with my original toyota evse. yesterday, i was there for a few hours and it finished charging with an ev range of 12.5 miles. at home with the 240v, it's been 12.3 for weeks now and was again today. i wonder if it is able to 'top up' a bit more with the 120v?

 

bisco i feel like you should really invest in a scan gauge or torque

 

agreed. i was waiting for peef to complete his custom job but it looks like it's not gonna happen. i should probably grab one on amazon. i'm not a tech like you guys tho, i hope i can figure it out!

 

Battery SOC? to make sure that the starting SOC is similar in both cases

wait what happened with you and peef?

 

he had started a thread showing his version of scangauge. (it's in here somewhere) it was a hundred times better and he was going to start producing and selling them. but then he got involved with leaf and left pchat and i guess got too busy to follow thru.

 

oh i thought you were talking about a custom charger. now looking back i can see that you were replying to my post saying you should get a monitoring device.

 

sorry about that.

 

#1 - It's actually more accurate to refer to L2 as 240V. That's why you'll get a reading like you see on my Fluke below, if/when you measure the power from your service panel out to your EVSE:



#2 - I recall the OP being asked & answered at least 2x on the board, and yes ... 240V charging is at least 10% more efficient than 120v charging. Or if you look at it from the other side, yes, you're wasting power when you charge L1.
.

 

If I recall correctly, there is some overhead during charging. This overhead (e.g. running the fan) does not go into charging the battery.

The overhead is a smaller fraction at 240V than at 120V, so charging efficiency is higher.

 

Yes, see my post here:
Charging efficiency of PIP | PriusChat

I measured about 9% losses ~26.5 kwh used, 29.1 kwh charged...over 7 days and 132 miles on EV.

Mike

 

Isn't this basic electrical theory...

 

200v inverter/chargers are always more efficient than 100v inverter/chargers.
Stepping down the voltage loses a few % more. Stepping up the voltage isn't considered an efficient design practice if a higher voltage is already available. 1 to 1 (or near) conversion with a small step-down is the best.

In order to push electrons into the battery they need to be subjected to a high voltage than those already in the pack. Since the PiP battery and charger were designed to be 200v systems this is the voltage where they are most efficient.
This applies to series strings PV panels and to PV microinverters as well. Each unit will have a slightly higher voltage as you go away from grid or charge controller load. http://enphase.com/wp-uploads/enphase.com/2011/12/EnphaseTechBrief_Vdrop_M215.pdf

Some examples of high quality inverter dc/ac and double converter ac/dc/ac devices usable for Prius generator conversion. Looks like APC is the only game in town using 208v nominal 280v Max input models. And yes they have other models that will convert 200v 50hz to 120v or 208v 60 hz and 100v 50hz to 120v 60hz if you must. http://www.apcmedia.com/salestools/SCON-8UHJUH_R0_EN.pdf

Efficiency
Models with 120 V Output / 120 V Input(90 -150 V)
Model SKU Efficiency
@ full load
APC Smart-UPS RT 1500 VA Rack/Tower 120 V SURTA1500RMXL2U 89.0%
APC Smart-UPS RT 1500 VA 120 V SURTA1500XL 89.1%
APC Smart-UPS RT 2200 VA RM 120 V SURTA2200RMXL2U 89.1%
APC Smart-UPS RT 2200 VA 120 V SURTA2200XL 89.1%
APC Smart-UPS RT 3000 VA Rack/Tower 120 V SURTA3000RMXL3U 85.7%
APC Smart-UPS RT 3000 VA 120 V SURTA3000XL 85.7%

Models with 120 V, 208 V Output( 120 V, 208 V, 220 V, 240 V) / 208 V Input(160 – 280 V)
Model SKU Efficiency
@ full load
APC Smart-UPS RT 3000 VA 208 V with 208 V to 120 V
Step-Down Transformer SURTD3000XLT-1TF3 92.0%
APC Smart-UPS RT 3000 VA Rack-Mount 208 V with 208 V to
120 V Step-Down Transformer SURTD3KRMXL3U-TF5 92.0%
APC Smart-UPS RT 5000 VA 208 V to 208/120 V SURTD5000RMXLP3U 90.0%
APC Smart-UPS RT Rack/Tower 5000 VA 208 V with 208 V to
120 V Step-Down Transformer SURTD5000XLT-1TF3 91.0%
APC Smart-UPS RT Rack/Tower 6000 VA 208 V with 208 V to
120 V Step-Down Transformer SURT6000XLT-1TF3 92.0%
APC Smart-UPS RT 6 kVA RM 208 V with 208 V to 120 V 2 U
Step-Down Transformer SURT6KRMXL3U-TF5 92.0%
APC Smart-UPS RT 6000 VA RM 208 V to 208/120 V SURTD6000RMXLP3U 90.0%

Models with 208 V Output (208 V, 220 V, 240 V / 208 V Input var. (160 – 280 V)(156 - 236 V)(160 – 280 V)
Model SKU Efficiency
@ Full Load
APC Smart-UPS RT 3000 VA Rack Tower 208 V SURTD3000RMXLT3U 92.0%
APC Smart-UPS RT 3000 VA 208 V SURTD3000XLT 92.0%
APC Smart-UPS RT 5000 VA Rack Tower 208 V SURTD5000RMXLT3U 91.0%
APC Smart-UPS RT 5000 VA 208 V SURTD5000XLT 91.1%
APC Smart-UPS RT 6000 VA Rack/Tower 208 V SURT6000RMXLT3U 92.0%
APC Smart-UPS RT 6000 VA 208 V SURT6000XLT 92.0%
APC Smart-UPS RT 8000 VA Rack/Tower 208 V SURT8000RMXLT6U 93.0%
APC Smart-UPS RT 8000 VA 208 V SURT8000XLT 93.0%
APC Smart-UPS RT 10,000 VA Rack Tower 208 V SURT10000RMXLT6U 92.0%
APC Smart-UPS RT 10,000 VA 208 V SURT10000XLT 92.0%
APC Smart-UPS RT 15 kVA RM 208 V SURT15KRMXLT 94.0%
APC Smart-UPS RT 20 kVA RM 208 V SURT20KRMXLT 94.0%

 

Vulchers fly over the Rabbits and the Indians. Class dismissed.

 

I hooked up my kill-a-watt in the garage and reset my Trip B and EV Driving Ratio 2. I'll be comparing kill-a-watt reported vs. PiP displayed kWh, to calculate the charging loss.