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charging cable lengths

i wanted to know if anyone can tell me the length of the charging cables? the config i'll be using is a nema 14-50 receptacle to the tesla. what is the length of the adapters and cables needed to make this config? i'm mounting the receptacle and need to know the length of the cable to plan.

thanks!

18 feet

really? ok, thx. is that like, 3' for nema14-50 adapter, and 15' for main section?

fyi, from walter franck at tm:

The charging cable that comes with Model S is 20 feet long. 20’ for the entire cable. The adapter is just a “head” part that can be swapped out, it doesn’t add any significant length. Our recommendation is to install your plug no further than 18 feet away. The charge port on Model S is the rear driver side.

If one needs just a bit more length, is there an acceptable extension cord that can be used?

They recommend no extension cord.

I'm living on the edge and have used this http://www.amazon.com/gp/product/B002XL2IG8/ref=oh_details_o03_s00_i00?i...
For 4 months with no problems.

There is some conflicting information above. For the USA (and presumably other countries):

1) The HPWC has a 20 ft cord.
2) The Mobile Connector (that is included with the car) is 18ft from the plug to the connector that fits the car. There is a module a couple of feet from the connector, but it's not really important as far as length goes.

In either case, I would recommend your distance between receptacle and the car's charge port should allow at least 5 ft less than these numbers if at all possible, and shorter distances is better. You really don't want it stretched tight between the two connections!

Some owners have used extension cords with the Tesla Mobile cord even though it's not recommended. If you go this route, get the shortest cord necessary and be sure it is rated equal to or better for the current you plan to use. Be prepared for very expensive extensions especially those that can handle 50 amps at 240V. If there is a significant voltage drop (which may occur), the car may automatically reduce the current.

A better solution is locating your connection point close to the car and avoid extension cords.

Like J.T., I have used the Camco 50 amp cord for more than a year with no apparent problems.

@Joeyeisen - yes, RV 50A extension cords will work. I'd recommend not using it for everyday use, but only occasionally.

@shop Wondering if you could expound on the drawbacks. I've read your threads on connectors so I defer to your superior knowledge on this subject.

@J.T. Here are some reasons why extension cords don't get recommended:

  • Their installation is not regulated, as it is done by "laymen" and, thus, cannot be truly trusted. This is a legal issue more than technical.
  • Each connection is a risk point. This is because of how the metal pieces touch. Theoretically speaking two metal plates will touch each other in exactly three points. And just tiny little points. All energy is channeled through these points and they present a significant resistance. Resistance in this case implies not only lower voltage at the car but also more heating of the connector - something that can be viewed as a risk of fire. Practically this is not nearly as bad but it is an issue. Think of these melted connectors - it wasn't the cable itself, but the connection point.
  • Weather proofing. Extension cords are often used outdoors. When all is dry all is fine, but who is taking responsibility that they don't get wet? With no extension cords, UMC will be connected to the car on one end (weatherproofed by Tesla) and at a licenced outlet on another end, weatherproofed if outdoors. With extension cords this may not be the case.
  • Simple safety. Ends of UMC are sealed and Tesla is responsible for those. But they are not responsible for the quality and state of extension cords. What if the connectors on extension cords are broken?
  • Rating. Extension cords ratings may actually be somewhat more wishful thinking than proper, depending on quality. Only the user is responsible for making sure they are using only outdoors-rated cords outdoors...
  • Some extension cords also allow multiple loads/consumers to be connected to a single supply. Tesla's system assumes it can draw a maximum current as a single load (i.e. no other load on the same circuit/breaker). If you add more loads you'll go beyond the limit. Circuit breaker would trip and your car wouldn't charge in that case... or if it does not trip you're in for bigger trouble - fire.

One more thing to consider - coiled extension cords tend to heat a bit more. Less extension cords (in fact, less loose cords of any kind), less coiling. You want them straight. Now, the effect is somewhat different than a simple single strand coil but is present.

All in all, good cords positioned well and taken care of are OK. You can think of it this way - if the electrician hides a proper extension cord in the wall it stops being an extension cord doesn't it? The point is that it was done well.

@sule Thank you for all the info. Your point about the installation inside a wall is a point well taken.

@TeslaTap - I measured my UMC at 20 ft. Is yours only 18? I've also seen an HPWC cable measurement of 25 ft. Are you sure about the 20 ft? I have a picture of a car connected to an HPWC and it is very obviously a much longer cable than the UMC.

I thought it was 20' for the UMC and 25' for the HPWC (but I don't have the latter)?

Either way, my wife doesn't like my McGyver'd solution with the UMC so I must need to buy a Tesla T rack like all the smart folks have...and clearly my "new" garage needs some more help ;-).


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