Page 1 of 9

240V Charging and Extension cables (Amazing-E)

Posted: Fri Nov 03, 2017 11:52 am
by bradleydavidgood777

I have a 2017 i-miev and usually charge for free at the work lot and at home using 120V.

I purchased the Amazing-e EVSE because I wanted to be able to charge faster at times at home and at other people's homes who may have different types of dryer recepticles. I also want to be able to charge at RV recepticles.

What I am trying to figure out is what to buy next and how to set it all up and I think I have a plan but want the opinion and ideas of those who have done this.

My dryer currently is 3 prong. I can't reach to the car in the back lot without a long extension cord.

I think 240V extension cords are normally sold for RVs so they would be a NEMA 14-50 connection.

So I think to start I would buy an RV extention cord (NEMA 14-50) on both ends, then buy or make an adapter to use from that to the 3 prong dryer outlet (NEMA 10-30). This way I have what I need for my home and old dryer connections at other homes. For this set up I would also need an adapter from the extension cord (NEMA 14-50) to the Amazing e EVSE which is 4 prong dryer male (NEMA 14-30).

Once I got that working then I would probably update my dryer recepticle from 3 prong to 4 prong so that I don't need to use that adapter. But would keep that adapter for use on the road.

Before I proceed I just wanted to see if anyone had any other ideas and that I am thinking about this correctly.

Also I am looking for places to buy the extension cord and adapters or websites on how to make your own adapters and any other advice.

Thanks for your help!

Re: 240V Charging and Extension cables (Amazing-E)

Posted: Fri Nov 03, 2017 12:50 pm
by Aivar
Extending high amperage is dangerous and you need to make sure you have what it needs. Look for cables that have good size AWG wire and are not damaged. The longer the cable the smaller the AWG number. Most codes will give you minimum but I say get one to make sure you don't fail. Like 6 AWG copper for 50f cable. Keep in mind that 50amp extension cords will cost hundreds of dollars so finding the shortest option is worth the money.

Re: 240V Charging and Extension cables (Amazing-E)

Posted: Fri Nov 03, 2017 3:28 pm
by jray3
Extending the cables is not dangerous if basic precautions are taken, especially since our cars only charge at 16 amps . My EVSE has been on a homebuilt extension cord (10 GA 3-wire) since 2011.
On this forum, JoeS has got to be the adaptor king. Take a look at his collection.

Re: 240V Charging and Extension cables (Amazing-E)

Posted: Sat Nov 04, 2017 12:58 am
by iwatson

You are correct. The RV extension cord you refer to is designed to handle a 50 amp load. These are for Large motorhomes that have two air conditioners as well as all the other power used by the motorhome and they are not cheap. They are not the extension cords you use to run a string of christmas lights. The amperage they are designed to handle is far greater than your little i-miev will pull.

Re: 240V Charging and Extension cables (Amazing-E)

Posted: Sat Nov 04, 2017 8:07 am
by Don
For sure he doesn't need a very expensive 50 amp RV extension cord to charge his car which cannot draw any more than 16 amps - That would be a huge waste of money!

Better to build your own custom cord using 10 gauge wire as jray3 suggested and put the ends you need on that wire. 10 gauge wire is rated to handle 30 amps. Much cheaper than an RV cord

Actually, if the cord is 50 feet or less, buying a standard 50 foot 12 gauge cord, cutting the ends off it and putting your own connectors on it would also work just fine and be cheaper yet. 12 gauge wire is rated to handle 20 amps. If you need a cord longer than 50 feet though, I would stick with 10 gauge wire


Re: 240V Charging and Extension cables (Amazing-E)

Posted: Thu Nov 16, 2017 7:07 pm
by Aerowhatt
Done this . . . You can use 12 gauge extension cord if you do it right. It's easy to carry and much less expensive.

The key is to have a circuit breaker at the power source end that matches your long cables capacity. I went with an outdoor conduit pull box and mounted a couple of din rails in it to mount two 20 amp circuit breakers inside it for the two hot 120 volt legs.

So from the high amp plug you have a short section (2 ft or less) of 30 amp cable with whatever receptacle you like. Then your fabricated box with breakers. Then the 50 ft of quality 12 gauge extension cord to run to your car and connected to the EVSE with whatever connector it comes with. Everything needs to be waterproof. It was easier than it sounds to put it together. In use, if anything happens to the cord after your added breakers then you don't have an out of control heating element wrapped in flammable materials with only the 30 amp or 50 amp breaker protection of the source circuit. They won't trip and it will start a fire!

It's the only way to do it right . . . except to run 6 Ga cable the whole run. Bye bye trunk space and don't forget the gym membership to stay in shape to lug it around.


Re: 240V Charging and Extension cables (Amazing-E)

Posted: Sun Nov 19, 2017 9:25 pm
by ChrisEV
Thought it was a bad idea to use the dryer outlet for charging. Something about those outlets not designed to be plugged/unplugged very frequently.

My dryer is in the basement I’d need to run a really long cord.

Re: 240V Charging and Extension cables (Amazing-E)

Posted: Mon Nov 20, 2017 9:17 am
by jray3
Yes, you certainly want to avoid running a long extension cord through the house or landscaping. My cord is just to enable the EVSE to be positioned on a post central to four parking spaces (two in the garage, two outside). It runs under a protective curb.
However, setting up your EVSE to be plug-connected is a big plus for portability. I installed a NEMA 14-50 outlet very close to the breaker box in the garage (easy DIY, no in-wall studs to drill through), and run the extension cord from there. It only gets disconnected a few times per year, but the electrical components don't wear out from regular use- there's just a lot of insertion effort required for a 14-50, many of the plugs aren't very ergonomic, and some of the outlet boxes are not well secured, so will loosen up (plastic box nailed to a single stud and clamped to drywall by the cover plate).
Now that public EVSE is reasonably easy to find around the Puget Sound, I rarely carry the L2 EVSE, but did so frequently in 2012-14. If I was living someplace with less infrastructure, I'd certainly want a portable L1/L2 EVSE with variable amperage settings. My SPX (now Bosch Power Express) was the first such unit, though better options are out there now, like the dual-voltage TurboCord and the cheaper DoStar.

Re: 240V Charging and Extension cables (Amazing-E)

Posted: Thu Dec 07, 2017 9:00 am
by bradleydavidgood777
Thanks for all of the replies. I have studied the home made adapters pages on the web.

My first step has been that I purchased a 50' and a 100' 10 gauge 120v extension cables. I installed these at my home running them to my front parking spot and also my back parking spot (both are needed depending on what's open).

These have 120 3 prong connectors and I am currently using the stock charger.

Next I want to build custom cables from new extension cables that I order (after cutting off the 3 prong 110).

I am getting an electrician at some point to upgrade my dryer from 3 to 4 prong but currently have 3 prong and would like to make a custom adapter from 3 to 4 prong. I understand from someone else's video that the ground is not used in the amazing-e so no need for it to be hooked up.

I cannot find the 4 prong dryer receptacle (female) (NEMA 14-30) that attaches to a cord. I can only find the ones for the wall. Ideally I was thinking of building an adapter from a 3 prong dryer cord to a 4 prong. Then on the extension cable, put 4 prong dryer connectors on both ends (can't find these either). But if I could build this, I would have a cable I could use at home and then have one for away and it could be used in both 3 and 4 prong dryer locations...and would be good to go when I get mine upgraded.

I just can't find all of the parts and see how its all going to come together nicely. Also, another option is to wait and have the electrician install some new 240 outlet outside of my house thru the wall near my dryer since he is going to get into that wall anyway for the new dryer cable....or everything may be run outside of the walls with metal flex or something if available. Just not sure what i want to do....need help with my options and parts locations...


Re: 240V Charging and Extension cables (Amazing-E)

Posted: Thu Dec 07, 2017 9:39 am
by Don
As Aerowhatt mentioned earlier, if you want to charge from a dryer outlet using a 10 or 12 gauge extension cord, you must employ a properly rated fuse or circuit breaker very near the dryer outlet you're plugging into - Your dryer outlet is probably breakered at 40 or 50 amps and your 10 or 12 gauge cord cannot handle that current should you have a short circuit somewhere . . . . you could start a fire when the extension cord overheats and melts

You could buy a small box, mount a pair of 20 amp fuses in it, buy a standard dryer plug and cord and run that into your box and run your 10 or 12 gauge extension cord out of the box and to your EVSE plug. This way, you're 100% safe (and legal) and if something happens, you'll blow the fuses rather than melting the cord