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It's hard to tell without destroying the cord(s), but if I had to guess on my Clipper Creek 16A charger, I'd say that it most likely uses 10-12 AWG wiring. The cord going from the EVSE to the wall is somewhere around a half-inch thick, and the cord going from the EVSE to the car is a slight bit smaller (~1/3rd inch, guessing based on memory)

I have a ClipperCreek LCS-20P Level II EVSE. It is designed for 240VAC at up to 16 amps so the components and wiring are designed to handle 25% higher current load than the OEM EVSE.

As Walter said, wire gauge is based on current. When you use the Gen2 OEM EVSE at 240V (with an adapter), the max current remains unchanged at 12A.I am using the factory charger at 240 volts and realized the wire is only 16 gauge.

Ignoring slight changes in efficiency and ramp up/down times, doubling the voltage will cut the time in half. If you are taking 13 hrs to charge at 120V, I'm guessing you are really not at 12A, but rather at 8A. This is true because:I stand corrected, you're right, it’s only pulling 12 amps at 240 volts. Why does it charge so much faster than 115 if the amps are the same? What will happen if I get a 240 volt charger? How fast will it charge then? I’m baffled by this.

P (power) = I (current) * V (voltage)

and

E (energy) = P * T (time) = IVT

or

T = E/IV . And since E is constant, doubling either I or V will have the same effect -- cutting the T in half. Similarly, changing the current from 12A to 16A changes the T by 12/16 or 75%.

Please read page 217 of the manual.

Your Ohm's law formulas are correct but remember that most household power is really about 117VAC. 117*12=1404 watts. The Volt battery when fully discharged requires about 15KWh of energy to charge it. 15000/1404=10.4 hours, but that is assuming no inefficiencies, or which there are quite a few!

In fact this report shows Level 1 charging efficiency to average about 84%, so 10.4/.84 = 12.7 hours is what GM engineers have determined.

https://www.veic.org/docs/Transportation/20130320-EVT-NRA-Final-Report.pdf

Charging is twice as fast at 240V versus 120V because when you double the voltage you are doubling the power. If you charge at 240V and 12 amps it will take approx. 5.5 hours to fully charge the Gen 2 Volt. If you charge at 240V and 16 amps it will take approx. 4.5 hours to fully charge the Gen 2 Volt. Due to the 3.6kW onboard charger in the Gen 2 Volt the charger will never draw more than 16 amps or charge faster that when charging at 240V and 16amps. The Gen 1 Volt has a 3.3kW onboard charger. Maximum charging for Gen 1 is limited to 240V and ~14.5 amps.

Thanks for the "clarification" of the time to charge for a Gen2 (which I don't have). Thus, I don't have the manual. If your number is correct, what say you to the claim that the OEM EVSE will charge in 4-5 hours at 240V? I took the 4-5 hrs at 240V as being the correct value, but it can't be both ways.bentbiker: sorry - you are incorrect. A Volt takes about 13 hours with a Level 1 (120VAC) charger to charge fully at 12A. At just 8A it will take about 19 hours.

Please read page 217 of the manual.

It's not a claim, it's a fact. Yes, at 240VAC the Gen 2 Volt takes 4.5 hours to fully charge. I'm not really sure what you mean by "it can't be both ways"? Please clarify.If your number is correct, what say you to the claim that the OEM EVSE will charge in 4-5 hours at 240V? I took the 4-5 hrs at 240V as being the correct value, but it can't be both ways.

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You only need a little bit of knowledge here to help you understand electricity.

The circuitry is set at 12 amps on the EVSE. Think of the wire as the size of a water pipe. A 1 inch pipe carries less than a 2 inch pipe. in this case you are limited to 12A which can be carried by a 16AWG wire just fine.

When you are charging using a standard 120V outlet then essentially only 1 wire (one pipe) is carrying the power to the EVSE. With the pigtail you made or purchased to use 240V you are now using 2 wires (2 pipes) to carry 120V each at 12A each to the EVSE.

Now what happens if you buy another 240V EVSE? Very little but not nothing. Gen 2 is capable of charging with a proper EVSE up to 16A I believe. Where a now you are limited to 12A you will increase by 4A. In the real world then you will charge approximately 30-45 min faster at 16A than 12A.

Now you have to ask yourself a question. Is that 30-45 minute bump worth it to you to spend $400+ on a new EVSE or Is it better for you to continue to use the one that you got for free (or with the car)?

That is a personal question that only you can answer.

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The EVSE signals to the car what maximum current is available, the car then decides how much to take, but never more than what the EVSE tells it.

Clarification: T is not changed by 75%, it's changed by 25%. The new T at 16A will be 75% of the T at 12A.Ignoring slight changes in efficiency and ramp up/down times, doubling the voltage will cut the time in half. If you are taking 13 hrs to charge at 120V, I'm guessing you are really not at 12A, but rather at 8A. This is true because:

P (power) = I (current) * V (voltage)

and

E (energy) = P * T (time) = IVT

or

T = E/IV . And since E is constant, doubling either I or V will have the same effect -- cutting the T in half. Similarly, changing the current from 12A to 16A changes the T by 12/16 or 75%.

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To the original question, I ordered the optional "soft cord" with the 50/40 JuiceBox, and that cord uses two 12 gauge stranded wires on each hot leg (so four total), with a single 10 gauge ground...if I remember correctly. I know this is more than our Volts require, but I was allowing for future considerations when I sized the system.

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