wwhitney
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Re: charging on generator

Sun Mar 18, 2012 6:31 am

Ingineer wrote:The easy way to make this work is take a screw-on plug (NEMA 5-15P) and install two 1/2 watt 100k ohm resistors. One from neutral (silver screw) to ground (green), and the other from hot (gold screw) to ground (green). Then simply plug this into one outlet on the generator, and your EVSE into the other. This will safely pass the ground detect on the Nissan (and our upgraded) EVSE, while not being a hazard in any other way.
Why the resistor from hot to ground?

Thanks, Wayne

MarkBC
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Re: charging on generator

Sun Mar 18, 2012 5:13 pm

Ingineer wrote:
MarkBC wrote:Just to bump this up the list, I also posted this question in the Engineering section. I got the Honda generator and need to modify the plugs to be able to charge the Leaf. I have learned that I need to connect the neutral and ground prongs for the EVSE GFCI check. However, it was mentioned that I need to connect via a 100,000 ohm resistor. Is this true?
The easy way to make this work is take a screw-on plug (NEMA 5-15P) and install two 1/2 watt 100k ohm resistors. One from neutral (silver screw) to ground (green), and the other from hot (gold screw) to ground (green). Then simply plug this into one outlet on the generator, and your EVSE into the other. This will safely pass the ground detect on the Nissan (and our upgraded) EVSE, while not being a hazard in any other way.

-Phil
Thanks, it worked! Unfortunately there seems to be only one electronics parts store in all of Vancouver, RP Electronics, and they are closed on Sunday. So I went to The Source and all they had was a 150 pack of assorted 1/4 W resistors which I bought. I used 180K ohm which should be fine at 1/4 W, and I only connected the ground to neutral, not the hot wire. I now have 149 extra assorted 1/4 W resistors...

Now I want to drive it out to the west coast to prove it can be done. I wrote a letter to Port Alberni to get them to put a Level 3 charger there because it is halfway between Nanaimo and the west coast, the perfect place for a zap. It hasn't been done yet, but in discussion apparently.

What I'll do one long weekend when I have the time (good luck finding time) is take the ferry over in the afternoon, then stop by Errington along the way where there is a Level 2 charger. I'll top off there for a few hours. Then I'll drive another 100 km until the battery dies, somewhere in the middle of nowhere, where I'll camp overnight and charge the car. Then in the morning I can finish the 100 km into Ucluelet. Not too bad of an inconvenience! And I will be the first person to ever drive an EV out to the West Coast.

mitch672
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Re: charging on generator

Sun Mar 18, 2012 5:47 pm

MarkBC wrote:...I'll camp overnight and charge the car. Then in the morning I can finish the 100 km into Ucluelet
I think it might take longer than overnight @ 120V, 12A, more like 16-18 hours, no?

If you stop at an actual RV park/campground, and have a modified EVSE, you could plug it in to a "pedestal" (50A 240A outlet) and get a full charge overnight, no generator required.
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garygid
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Re: charging on generator

Sun Mar 18, 2012 5:59 pm

Caution: If you drive until it stops, you might not be able to get safely off the road, and unlikely to be anywhere near a place where you can camp and run a generator.

Even if you carry enough gas to refuel your generator every few hours, most places will not let you run it during their night time "quiet" hours.
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MarkBC
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Re: charging on generator

Sun Mar 18, 2012 8:30 pm

12 hours charge should be good, I don't run it totally dry and I don't charge it all the way since you seem to lose lots of charge quickly when fully charged anyways.

I'll be camping in the middle of nowhere so there won't be any "quiet time"...

Of course, if Nissan made a genset trailer that would solve ALL these issues!

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TonyWilliams
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Re: charging on generator

Sun Mar 18, 2012 9:21 pm

MarkBC wrote:12 hours charge should be good, I don't run it totally dry and I don't charge it all the way since you seem to lose lots of charge quickly when fully charged anyways.
It doesn't use the energy at any greater or lesser rate, except for extreme temperatures where the power is limited, and when the battery is almost empty, in "Turtle" mode, when again, the power is limited.

Obviously, limited power will use less than normal. But it won't use more, unless you ask for more energy use (turn on the heater, stomp on the gas pedal, turn on the lights, etc).

Please don't make decisions based on inaccurate info. If you need the range, charge the car to 100%. Just don't leave the car sitting for extended periods at 100%.

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Ingineer
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Re: charging on generator

Mon Mar 19, 2012 12:48 am

wwhitney wrote:Why the resistor from hot to ground?

Thanks, Wayne
Keep in mind, on a isolated generator, there is no real "hot". The resistor puts the apparent ground right in the middle (+/-60v RMS), which is safer than arbitrarily designating one as hot. 100k is more than enough to pass the ground check, but will not pass enough current to be dangerous, and in fact, probably can't even be felt through most people's bare skin.

I still recommend two 1/2w resistors for safety, as I've seen 1/4w's fail to lower resistance at 120v. They are also more rugged.

-Phil
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dgpcolorado
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Re: charging on generator

Sun May 20, 2012 12:33 pm

Ingineer wrote:The easy way to make this work is take a screw-on plug (NEMA 5-15P) and install two 1/2 watt 100k ohm resistors. One from neutral (silver screw) to ground (green), and the other from hot (gold screw) to ground (green). Then simply plug this into one outlet on the generator, and your EVSE into the other. This will safely pass the ground detect on the Nissan (and our upgraded) EVSE, while not being a hazard in any other way.

-Phil
Ingineer wrote:
wwhitney wrote:Why the resistor from hot to ground?

Thanks, Wayne
Keep in mind, on a isolated generator, there is no real "hot". The resistor puts the apparent ground right in the middle (+/-60v RMS), which is safer than arbitrarily designating one as hot. 100k is more than enough to pass the ground check, but will not pass enough current to be dangerous, and in fact, probably can't even be felt through most people's bare skin.

I still recommend two 1/2w resistors for safety, as I've seen 1/4w's fail to lower resistance at 120v. They are also more rugged.

-Phil
Thanks for the info. I gave this a try and it works fine. Working through Ohm's Law, the current through the resistors should be about 1.2 mA, 0.14 W, a tiny amount and well within the limits of the ½ Watt resistors.

I took advantage of a sale on the Honda EU2000i at the local farm and ranch supply store. Got the resistors from Radio Shack and the plug from Home Depot:
Image

Image

Image

120 Volts is a very slow way to charge but it should help me extend my range limits somewhat. I figure that if the cities in my area ever do install L2 public charging I can always sell the generator on Craig's List; they are very popular with RVers.
Last edited by dgpcolorado on Mon Jun 09, 2014 7:06 am, edited 1 time in total.
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TonyWilliams
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Re: charging on generator

Sun May 20, 2012 12:40 pm

Can somebody please confirm that there won't be a problem with this resistor plug setup for non-generator use?

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dgpcolorado
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Re: charging on generator

Sun May 20, 2012 12:44 pm

TonyWilliams wrote:Can somebody please confirm that there won't be a problem with this resistor plug setup for non-generator use?
:?: The grounding plug for generator use is separate from the EVSE. It just goes into the second outlet on the generator. Doesn't have anything to do with modifying the EVSE. Or am I missing what you're asking?
Image
Last edited by dgpcolorado on Sun May 20, 2012 12:49 pm, edited 1 time in total.
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