Charging the Kona EV with a Generator?

Discussion in 'Hyundai Kona Electric' started by Toolworker, Nov 25, 2021 at 3:23 PM.

To remove this ad click here.

  1. I have a Honda EU2200i generator and seven gallons of two year old stabilized gas that I'd like to run through it and charge my Kona EV. It would avoid taking the gas to a toxics recycler (and incidentally provide a true MPG figure for a car that can't burn gas).

    The problem is that the Hyundai charge cord shows a fault. Apparently the generator has a floating ground. I've tried connecting its ground terminal to a grounded water pipe and the ground pin of an outlet (both over a long extension cord) and several metal stakes up to 18" into the ground.

    Has anyone made this work, with this or any other floating ground generator? Any suggestions?
    electriceddy likes this.
  2. To remove this ad click here.

  3. [​IMG]

    We used this (pretty much a necessary accessory to carry at the time with Leaf Gen1 range when new @80 miles) as there were limited public charging spots. Read the details provided in the related thread postings:)
    Last edited: Nov 25, 2021 at 4:32 PM
  4. Thanks for the suggestion. But it didn't work.

    With Home Depot closed today, I tested this by jamming two 100k resistors into the socket end of a PC power cord, and plugging it into the generator, carefully keeping my distance. Same setup as yours, I believe, except the jumper cord had to go in the left hand socket because of the Hyundai plug. It still got the fault indication. I checked the resistance at the plug between ground and each pin before and after several tests that I ran, with the Kona connected and not.

    Perhaps the Leaf's cord is less fussy than Hyundai's? A post further up that thread said "A single EU2000i will charge the Leaf at 120V 12A fine."

    The thread also suggests jumping the neutral and ground wires of the generator output. Maybe I should give that a try.
  5. It could be a generator floating neutral that is the problem. Check your generator manual see how it's wired.
    Essentially the EVSE continuously expects to see a current of roughly 0.2 mA being able to be passed from line to the ground wire, much the same as if it conducting into neutral. A normal bonded neutral supply provides that.
    At 120 VAC that's 120/0.0002 = 600K ohm which would drop all the voltage. The 100K might be adding too much voltage drop to allow quite enough current. Try 50K in a 1/2W size N to G or just tie N to G if that's allowable per Honda.
    Last edited: Nov 25, 2021 at 7:33 PM
    Toolworker likes this.
  6. To remove this ad click here.

  7. mikeselectricstuff

    mikeselectricstuff Active Member

    Connect the charge cable's ground to the neutral.
  8. hobbit

    hobbit Well-Known Member

    I had to construct a ground-fakeout adapter to run the granny-charger from my Yeti power boxes, which have
    not even a pretense of a ground connection. The ground is basically just a pilot signal reference, the AC
    is what actually matters for charging.

    aka, what mike just said...

  9. Bingo! I plugged a 50K resistor across the neutral and ground pins of the spare socket on the generator. The Hyundai EVSE cord is happy. The Kona is slowly charging.

    Safety checks: I put tape across the resistor to prevent accidental contact, and will make a real plug-in jumper next time I get to Home Depot. The voltage between the car chassis and a grounded conduit slowly cycles between 50 and 110 mV, regardless of whether the charge cord is connected and charging, or disconnected.
    apu, KiwiME and electriceddy like this.
  10. Good back up just in case, glad the resistor idea worked for you;)
  11. To remove this ad click here.

  12. So, what did you end up with MPG-wise, Toolmaker?

Share This Page