RV adapter

Discussion in 'Hyundai Kona Electric' started by R P, Jul 20, 2019.

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  2. Those RV dog bones from TT-30 Male to 14-50 Female will take the ungrounded conductor (the hot wire) to both sides of the 14-50 female, giving you a net result of 0 volts between the hot pins. (120V between each hot to "neutral" pin, so it will not work).
    Make sure your EVSE has a voltage input rating between 120V and 240V and use the proper a EV dog bone such as this:
    The other thing to watch is that your EVSE has an adjustable o/p current to 24 Amp max (120V * 24A = 2880 W) or it will trip (overheat) the breaker (hopefully). Use one like this:
  3. That one should work as its 120V TT-30 3 pin to 120V 5-15 also 3 pin, only problem there is no 15A overcurrent protection . I have seen generator ext cords c/w o/c protection:
    https://www.homedepot.ca/product/firman-25ft-power-cord-tt-30p-and-5-20r-receptacles/1001200066 (note: no 90 degree angle, may pull out of receptacle without support)
    This one gives the length you may need and has o/c protection.
    Will enable up to 16A, however I think the Hyundai EVSE is rated at 1200W (that's one thing I haven't even looked at/taken apart yet)
    To do list
    Some RV sites have 14-50 (120/240V 40A continuous max) (but you pay for it), some have TT-30, and all have at least a 5-15 or 5-20 (120V- 15 or 20A), minimum Canadian electrical code 72-110 (sub-rule 1) 24th edition
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  5. mikeselectricstuff (recent member) posted a video on you tube some time ago comparing the Khons and Zencar(aka Primecom referred to above post)
    and the Zencar is the clear winner

    This is the one I will get for a trip planned later, just waiting for the $ to reduce( it fluctuates and has been available for some time)
    patience-this is an engineer talking- sorry Mike:) summary at 39:39
    The RFID is handy in this situation to adjust amperage accordingly.
    Last edited: Jul 20, 2019
  6. I just tested charging on an TT-30 amp plug. (I have an RV spot on my property with a NEMA TT-30 outlet.) Yes it is possible to charge at a higher level with the NEMA TT-3. Tthe Kona showed 1.9kw at minimum setting 2.6 kw and 3kw at maximum. I have an older GE DuroSation Level 2 (240v) Charger. In reading the manual I noticed that it has a low voltage alarm goes off 82 volts so I figured I could run it on 110 Volts with out triggering an alarm. I made an adapter with a NEMA TT-30 plug on one end and a NEMA 14-50 receptacle on the other end. I made sure that the neutral on the adapter corresponded to L2/N line on the J-1772 plug. After carefully checking that all the connection were correct, I tested it. I set the charging at a minimum on both the 240 volt and the 110. The interesting thing I found is that the car still see the connection as a 240 volt. I assume that because the EVSE tell the Kona a level 2 charger.
  7. Is the neutral on the adapter connected to the ground of the TT-30 or just left empty?
  8. I left the neutral on the NEMA 14-50 empty. The ground from the TT-30 goes to the ground on the 14-50. So the two 14-50 hot prongs get the one hot and the one nuetral from the TT-30. Just make sure the hot prong getting the neutral on the 14-50 is the same line leading to the the L2/N prong on the J-1772. On my EVSE the lines are clearly marked. I am not sure that's the case with all EVSE

    Last edited: Sep 9, 2019
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  10. In other words, what you are saying is that the L2/N on the J1772 is empty (no connection to anything). My J-1772 EVSE plug has no markings, but I see a 2 on one of the connectors on the car plug cap. Is that the one you are talking about. So, can I just do a line test with on both ends of the EVSE to see which it is?

    Would this adapter work?

    Or this one?
  11. Whoops I think I misunderstood. Let me try again. You are taking the neutral from the RV plug and connecting it to the one of the hot prongs (x or y) of the 14-50. And the original neutral on the 14-50 is left empty? Is that correct?
  12. Yes that is correct. The 14-50 neutral is empty not the L2/N. The neutral on the TT-30 (Travel trailer 30 amp plug)( white wire) goes to one of the hot leads on the 14-50, the black hot goes to the other hot lead. That way instead of seeing 240volts across the two hots you see 120 volts across the two hots. The neutral must show continuity from the TT-30 through a hot lead on the 14-50 ending up at L2/N on the J-1772 Here is a picture of my j-1772 plug showing L2.

    You can't do a line test to L2 because it goes through a relay that is open when the car is not plugged in, and obviously you cant do a line test when its plugged in an powered up.

    To any one who does not feel 100% confident and competent with electricity and electronics I would suggest deferring to some who is.


    Some EV adapters work but I would take that up with the manufacturer. Also check with the manufacturer of your Level 2 charger to see if it is compatible with 110 volts

    Last edited: Sep 9, 2019
    R P and electriceddy like this.
  13. The EV adapter for the Tesla might work if two conditions are met. 1) Who ever is selling this has actually wired it correctly for EVs and is not just repackaging RV connectors that don't work and selling them as EV connectors. 2) your Level 2 charger is compatible with 110 volt and is wired the same as a Tesla charger.
  14. Here is an EVSE tt-30 to 14-50 adapter at home depot for $35. Looks like a good deal. I spent all most that much on parts. It is also for a Tesla. The nice thing about home depot is you can just take it back if you aren't happy with it. If you get one test that it has 120 volts across the two hots when plugged (X, Y (left right)) if it doesn't take it back. Also make sure your level two charger is compatible with 120volts.

    R P likes this.
  15. As above this adapter should work- however only available in U.S.
  16. Well, I have certainly learned a lot more, and I thank you for that. As it happens, I live just across the border and there is a Home Depot in Bellingham. I could order and pick it up there if need be. I should check if our local one (Langley) could bring one in and see what that price would be.

    There is still a question about whether my current Morec EVSE could handle 120V. It is a 32A 240V EVSE and the manual says it has low voltage protection, but does not say what the cut off level is. Might be worth a try as long as it can't be damaged.
  17. TheLight75

    TheLight75 Active Member

    That's not the one you'd want (as you want a male TT-30 to a female NEMA 5-15), this is one you need: https://www.amazon.com/gp/product/B074LVQK8H/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

    It will charge just fine with the Hyundai 120V EVSE @ 12amps. I did this exact thing last month on a 3-day camping trip.

    Smaller campsites that are intended for tents or smaller towed campers will have a 120V 30amp TT-30 hookup. The larger campsites intended for full-size RV's will have 240V NEMA 14-50 plugs. I've found that some campgrounds will require that you actually have an RV in order to book the bigger sites.
  18. Yes, fine for the granny charger. But I want to use my Level 2 charger with the TT-30 to get some extra kVs charging from the 30A RV outlet.
  19. I noticed this EVSE charger looks absolutely identical to my Morec. And it is advertised to operate at 110V - 240V. Probably same Chinese product, just different branding. That gives me more hope that my Morec will work with 110V so I can use an RV 30A outlet with the Tesla adapter.


  20. FloridaSun

    FloridaSun Well-Known Member

    Wouldn't the 32 amp version trip the breaker on a 30 amp rated outlet?

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