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Extension cord for charging from Dryer outlets

Many owners say that if they are visiting a friend's home and need a charge, they rely on dryer outlet if available. In case dryers are away from garage or a place where car is parked, I am assuming that these folks are using an extension cord. What are the specificaitons and links for some of these extension cords? I am wondering if on road trip, we should also keep such an extension cord along with UMC for just in case. This allows us to get power from many homes at a faster rate than say 110 V.

Great question! I've been looking at this and found this 10-30 extension cord:

http://www.steam-brite.com/power-extension-cord-volt-gauge-wire-with-end...

I imagine for safety's sake that if you are connecting this outside you should wrap the join in Saran wrap to keep out moisture from rain, snow, dew, etc.

Has anyone else used this particular extension cord?

Tesla apparently does not sanction the use of electrical cords at this amperage (for obvious reasons).

There are two different 30-amp plugs that are commonly used for clothes dryers in the US, depending on local electrical codes and when the house was built. 10-30 is a three wire plug--L1, L2, and a combined ground and neutral. 14-30 is a four wire plug where the ground and neutral are separate. This is more common in newer homes.

Tesla sells adapters for both, but you need to be sure which one you need. For charging, you do not need the neutral, but you do need the ground.

Fifty-amp plugs have the same complication--6-50 and 14-50.

You can buy plugs, receptacles, and wire at Home Depot if you want to make your own.

I was looking at my dryer and indeed it is 14-30. Shape is like NEMa 14-50. So we may need two types of extension cords for two types of dryers. I am learning so much. If we use UMC to get power from 14-30 is it smart enough to not ask for 40 amps and trigger the breaker as I am guessing same cable will be going in 14-30 or 14-50.

He common conductor pin is different on a 14-30 and a 14-50. When you use the adapter for the outlet the car will know what it is plugged into and set amps accordingly. You can also set amps manually in the car.

Not sure that was clear. A 14-30 won't plug into a 14-50. And a 14-50 won't plug into a 14-30.

Thanks Roamer. Getting more clarity.

There are many threads on this topic. Perhaps the most comprehensive is this one:

http://www.teslamotors.com/forum/forums/bag-spare-adapters

If you look at my post on August 24, I list everything I got and where I got it. I based this set around a 50' NEMA 6-50 (welder) cord. I chose that cord for several reasons: with three wires, it is a lot lighter than a comparable four-wire cord, plus I can adapt it back to virtually any other outlet type, so I don't need to carry more than one extension cord. The cord is good quality, and they will even print your name on it. I have tried virtually all of the permutations and combinations in this set, and all have worked fine. In other words, I can charge from up to about 70' away from just about any drier, welder, RV, or standard 110V 15 or 20 amp outlet.

Always check the cord an hour or so after you plug in to make sure it is not getting warm.

I just did this with a 10g extension cord used to use for my table saw. Put a 14-50 female on one end, 10-30 (old style dryer) on the other and tried it at my In-Law's house. Turned the rate down to 24 amps. Worked great.
This is the best resource I have found (from link on TeslaTap site):

http://cosmacelf.net/Home%20Made%20Adapters.pdf

I made my own dryer-to-1430 10-foot extension cable and outlet based on instructions on this forum, and parts from Amazon. Just make sure you use heavy enough cable. I have used it at several relatives' houses to extend the UMC's reach into laundry rooms and basements. I am not an electrician, but can connect A to B without causing a short. There's not much risk, as the car self-evaluates the connection and won't engage if you do something wrong. Your mileage may vary...

We bought a 100 ft 6 gage yellow contractor job site cord equiped with 14-50R and 14-50P on the ends at Menards. They also had 14-30 14-50 pig tail adapters. Actually got change from a couple of hundred dollars. For about half that cost they had plugs and drop-cord to make your own---but you woudn't get the nice molded plugs on the cord.

I use an unused 10-30 dryer plug for all my charging. I did have it moved from laundry room to garage. It works fine at 17mph and stays nice and cool.

You won't find a ready made dryer plug extension cord (either for a NEMA 14-30 or 10-30), so use one of the resources listed above to learn about and make your own.

I made a 20 foot NEMA 14-30 extension cord using a nice outlet and plug I found at my local Ace Hardware along with flexible 10 gauge wire (rated for 30A). It cost me under $30 to make and worked quite well until I was able to install my HPWC.

For 14-50, just search Amazon for RV extension cords!

What I got is a 50Amp extension cord and 4 adapters for different plugs, including the 2 different dryer types:

30' 50Amp extension
http://www.amazon.com/dp/B0024ECIP0/ref=wl_it_dp_o_pC_nS_ttl?_encoding=U...

Adapter 1:
http://www.amazon.com/dp/B000BUQOGI/ref=wl_it_dp_o_pC_nS_ttl?_encoding=U...

Adapter 2:
http://www.amazon.com/dp/B005BNZEZC/ref=wl_it_dp_o_pC_S_ttl?_encoding=UT...

Adapter 3:
http://www.amazon.com/dp/B005BNZFQ0/ref=wl_it_dp_o_pC_nS_ttl?_encoding=U...

Sorry, can't find a link for the last one, but you get the gist. The extension is also useful when I want to charge my MS outside my garage (my 14-50 plug is on the back of the garage as I back into the garage to get the most out of the space with 2 cars in it - both car driver sides facing each other).

whitex - all three of those adapters you list WILL NOT WORK for Tesla charging. They all adapt a 120V source to the NEMA 14-50, but do it in a way that is useful for RVs, but useless for Tesla charging. Briefly, they take the single 120V hot from the 120V source and put it on BOTH 240V hots for the NEMA 14-50. The Tesla will see 0V when one of these is used.

Also you will rarely find a use for those three adapters. The first is a TT-30, generally found only in campgrounds, and usually there would be NEMA 14-50s available there. The other two are locking connectors generally only found on generators.

Finally, I like this extension cord better (it is far lighter, more supple, but it does cost more):

http://www.amazon.com/Conntek-14305-25-Foot-Extension-Cord/dp/B003I2LLSW...

@shop: Cable link from you costs $178 whereas whitex cable costs $104. So yours seems more expensive.
Third adopter by whitex (link below) seem to change from 14-30 to 14-50. Is that also from 120V and Tesla will see nothing. I thought third adopted can get us power from dryers from friend's place. http://www.amazon.com/dp/B005BNZFQ0/ref=wl_it_dp_o_pC_nS_ttl?_encoding=U...

Based on above, just ordered dogbone adapter and 50 amp cord - camco. Hope it works as well as recommended. Thanks.

Hi Mantin, what do you mean by dogbone adapter? Can you provide me its link? Thanks
Amit

@amitb00 - yes I said my extension cable costs more, but was nicer.

Third adapter from whitex does not change from NEMA 14-30 to NEMA 14-50. It adapts a NEMA L14-30 Locking Plug. Which is quite different. I find it very unlikely that a NEMA L14-30 can plug into a dryer receptacle.

@plusplusjames - I stand corrected. That is indeed a NEMA 10-30 extension cord for an old style dryer receptacle which would work fine for Tesla charging using a Tesla 10-30 adapter. Kinda expensive though.

James the cord you show is 10 gauge wire while the http://www.amazon.com/Conntek-14305-25-Foot-Extension-Cord/dp/B003I2LLSW is 6 gauge wire for caring 50 amps with a 8 gauge ground wire. This cable has a lot more copper in it to carry the higher amperage. I dud choose this type of cord as it can safely carry the amperage required for a faster charge. You get what you pay for.

@shop

You are correct, I won't find much use for the the first two adapters unless I find a 220V generator with one of those plugs. So far I've only used the extension cord. The 4th adapter I got (haven't used it yet) is a 4 prong dryer plug to NEMA 14-50 - it has a 1:1 connection for each phase, neutral and ground, so it should work fine.

I think the key here is to get one extension cord and a set of adapters for the the extension cord plug, rather than many adapters for the Tesla charging cable (which would require folks to get many different extension cords). The only drawback is that you have to limit your charge current manually according to what you plug into, rather than it being automatically detected by the car (I am assuming here, haven't used any of the other Tesla adapters).

@shop

Correction, after looking at the first 2 adapters again, I think you are right, they won't work.

EVSEadapter.com

@solarguy01: Colin from Tesla called me yesterday and explained to me (as someone who knows nothing about electricity) the importance of gauge. This confirms what you wrote. The lower the gauge, the safer the wire. I think reducing the possibility of fires at my friend's and family's houses is kinda important.

Accordingly, I am now thinking of buying the cable you suggested together with adapters from EVSEadapter.com.

My Model S doesn't get delivered until March 28th so I have lots of time.

Oh yes, and DO NOT FORGET TO DIAL BACK THE AMPS!

Several other considerations when approaching these projects:
1. Know where the outlet breaker is, so it can be flipped if things go unexpected. Advisable not to unplug at these power flows, which is often the first instinct.
2. The longer the extension cord, the bigger (lower number) gauge wire required. There are many charts and graphs.
3. Might consider picking up a Class C fire extinguisher at Home Depot.

I bought a dryer cord and a 14-50 outlet to charge while away in ME, since Tesla doesn't sell a 10-50 adapter. Cost about $35, and easy to put the 2 together. Luckily I didn't need to add much length to use their outlet.
I have a 10-50 in my house too for a dryer, but it's wired to a 30A breaker(!) so I suggest anybody finding this old outlet check the breaker panel before using it.


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