Bag of Spare Adapters?

Bag of Spare Adapters?

TM now has several adapters for sale. Is there much benefit to buying some or all of them to have on hand when out on the road?

txjak | April 30, 2013

@shop -- I just looked over your document and a question occurred to me.

You list the J1772 adapter plug as provided by Tesla as a 240v/32a (7.6kW) device. So my question is, do we need a different adapter plug in order to use a 80a J1772 station or will the same plug work?

shop | April 30, 2013

Sorry, sloppy shorthand on my part. I do believe the same J1772 adapter works on high amperage 80a charging stations, again assuming you have twin chargers, or else it'll fall back to 10kW max.

shop | April 30, 2013

@gimp_dad. You may have found a new addiction for the psych manuals. I'm not much better, having just made a NEMA 6-20 adapter for no particular reason. So far I've resisted buying the Roadster adapter. Just gotta hold off.......

gimp_dad | April 30, 2013


By the way, there are some hotels and motels that have 6-20 plugs for their AC units. That's where I figured it would get used if ever. I could especially see it in one of those motels where you park right outside your door.

I guess this should give you about 2.5x the charge rate of a normal 120V outlet. Definitely, could make the difference between getting charged overnight and not.

The computer room is the other possibility but even I am hard put to come up with a scenario where I have access to the power in a computer room...

DouglasR | April 30, 2013

@gimp_dad - Good luck with actually getting the Roadster-to-S adapter. I ordered one months ago, and it still hasn't come.

gimp_dad | April 30, 2013

DouglasR, how did you order it? I asked my deliver specialist and my experience specialist each to order for me. Both said they did but I never got any confirmation or anything. Same thing happened with 14-30 and 10-30 adapters which eventually became available online at which time I ordered them and shortly later they arrived.

dsecrist | April 30, 2013

It is now available in the Tesla online store.

DouglasR | April 30, 2013

Amazing! Thanks, dsecrist. I ordered it from the Seattle service center. Maybe I'll order online also.

DouglasR | April 30, 2013

OK, I just called, and the Seattle Service Center just got in a sh*tload of parts. Chances are it's there, along with my parcel shelf (which I ordered after I got the car).

DouglasR | April 30, 2013

They just called back and both items are in.

fluxemag | May 13, 2013

I built a TT-30 adapter according to @shop's directions. Plugged it in at work and read 120V. I don't have my car for another week or so, so I will have to wait to test it for real. Even if I only get a few miles per hour charge, that will cover most of my commute and pre-cooling the car. Or maybe during a car nap with the AC running.

shop | May 13, 2013

Out of curiosity, why do you have a TT-30 at work?

fluxemag | May 13, 2013

Large semiconductor company that has huge parking lots with a few empty contractor lots. Thee were semi-permanent contractor trailers hooked up out there for years. I asked facilities for outlet locations in the parking lots and this was the best I could do.

fluxemag | May 13, 2013

I have asked building services to put in an EV charging station because there are a few other employees with plug in hybrids or full electric. All I need is a 50A outlet obviously. They said they are "working on it". But between that outlet and the Tesla store by a favorite restaurant (City Hall), I may never charge at home. Lobster mashed potatoes and bone in ribeye with the seafood platter. Just sayin.

shop | May 13, 2013

Cool. If the TT-30 outlets are close enough together, you could see if some of them are on different phases. You could build a special adapter that plugged into two TT-30s and get 240V at 24 amps as opposed to 120V at 20 amps (since the Tesla limits 120V charging to 20 amps). An easy way to check is to stick the two probes of a voltohm meter into the hot of each TT-30 and see if it reads 0V or 240V (or 208V if coming off 3-phase commercial power).

GrnHotChiliEpper | May 13, 2013

If you created your own wouldn't this void coverage?

shop | May 13, 2013

Void Tesla warranty coverage? Only if your adapter caused damage somehow to the car. Lots of people have built adapters with no ill effects to the car. Volts are volts. It isn't that complicated.

shop | May 20, 2013

@gimp_dad and others. Here's another cute box to feed your Tesla adapter addiction.

It has a bunch of features - a 240V meter to make sure you are plugged into different phases, 20A breakers for each leg, and dual 25' power cords to reach 50' between outlets. A bit pricey though. Almost makes me want to build one myself. Must ... resist ... the urge...

Musterion | June 17, 2013

Charging solution with spider box w/pics

(Since this is the only thread mentioning spider boxes...)

I've held off installing the HPWC until it is clear how the fixed version will be distributed. In the meantime I intended anyway to keep a 50A circuit as backup, so I've now installed it with an inline spider box that can sit in my garage and do Tesla charging, or else can be taken outside on 75 ft. cord for powering tools when working outside away from power outlets and the house. The length was chosen to balance outdoor usage and voltage drop (although I could take it out of line, it is convenient to keep coiled up in garage near garage door so easy to use when needed). In addition I get some 20A receptacles and a 30A twist-lock when needed. The installation involved all off-the-shelf parts: cords and receptacles from eBay and Amazon; modular mounting hardware from Home Depot. I standardized around the 'California-Standard' 50A ship-to-shore twist-lock system and can also hook up without the spider box in line if desired. The main circuit is protected by dedicated breaker and panel, and the spider box has its own internal breakers plus GFI for the 20A circuits, in NEMA-3R outdoor rated roll cage.

System charging and UMC closeup:

shop | June 27, 2013

Hey guys, just wanted to put a plug in for - I'm not affiliated with them, but just ordered their universal NEMA 10 adapter (works with NEMA 10-30 and 10-50) to check them out. The NEMA 14-50 plug they use is nicer than the Camco one I had been using - it is smaller and has a more solid feel to it. Making a universal NEMA 10 adapter is a bit tricky unless you have a metal blade bandsaw and steady hands, so buying a ready made one is nice.

Also, I went ahead and made myself a 2x120V adapter that works with both 120V NEMA 5-15 household receptacles AND TT-30 receptacles, so that if I get stuck I can charge quicker and it gets around Tesla's 20A restriction for 120V sources (since it provides 240V). The post for that little project is here:

DouglasR | June 27, 2013

@shop - If you had to recommend the PURCHASE of a set of adapters/extension cords to give the greatest versatility, what would it be? Assume I'm not going to build anything, so the pieces must be available for sale.

So I'm thinking:

1) a 14-50 extension cord to go from my UMC/14-50 adapter, to plug into a 14-50 outlet.

2) a 14-30 adapter (14-30 plug/14-50 receptacle -- need to dial down the amps)

3. a universal NEMA 10 adapter

4. a TT-30P/14-50R adapter.

5. a second extension cord for 110V outlets.

Did I get these right? Will they cover the great majority of outlets I'm likely to find? Is there any way to do this with just a single extension cord? Thanks.

gimp_dad | June 27, 2013

Thanks, shop. I finally got to order the TT-30 to 14-50 adapter instead of building my own to the unique wiring requirements.

On a related note, has anyone come up with a bag for all these adapters that fits perfectly into the square part of the trunk? I have that whole area filled with 8 adapters, a 40' 50A extension cord, the UMC. It is a mess and I would like a bag that is very close to the exact shape and size of that entire volume of space.


shop | June 27, 2013


That looks good. There are other adapters you can add depending on what you think you might encounter. I go to a lot of horse shows which have temporary power all over the place. Other folks might work on large construction job sites. And others may have access to 50A marine ship to shore plugs. All these are satisfied with this:

I don't need a 120V extension cord as I made a 14-50 to 5-15 adapter, so I can use my 240V 50A extension cord as my extension cord (although it is a big of overkill for that!). If you do get a 120V extension cord, I wouldn't go smaller than 12 gauge for 25', and go to 10 gauge if you wanted 50'.

The only other receptacles that you may run into are NEMA 6-20 and NEMA 6-30 which are often used for motel air conditioners, but I haven't seen anyone sell these adapters.

Also, if I had to do it over, I would get the lighter Conntek 50A extension cord rather than the Camco one.

TFMethane | June 27, 2013

$650 for a single Roadster--> model S adapter seems really expensive. I think they are pricing it high mostly to keep demand down. Tesla has had a bear of a time meeting demand for charge/UMC adapters.

Has anyone seen an inverter that can combine a 30A 220V and a 20A 120V source? I have an old house, and if I could get something like 50A charging for a couple hundred bucks, I wouldn't consider paying the $2700 in electrical upgrades, etc. to install the HPWC.

shop | June 27, 2013

If you have a 30A 240V source in your old house, you can use that for charging. Otherwise, pay an electrician to install a 50A circuit. You can't combine circuits like you described.

DouglasR | June 28, 2013

Thanks, shop. I take it you have not seen a 14-50 to 5-15 adapter for sale anywhere?

shop | June 28, 2013

I haven't seen a 14-50 to 5-15 anywhere.

gimp_dad | June 28, 2013

DouglasR, if you buy the 14-50 to TT-30 adapter from site pointed to by shop ( ) then you can get the following TT-30 to 5-15 adapter

This will allow you to use a 50A 240V extension cord by chaining the two adapters mentioned above between the extension cord and the wall outlet.

And, yes, I go to great lengths to avoid making adapters because I am lazy. For my case, I actually chain 3 adapters as my cord is a 6-50. So I have (starting from the connector on the car) the following chain to connect to a 120V outlet if I need my extension cord:
UMC plugged into car
6-50 adapter on UMC
6-50 extension cord
6-50 to 14-50 pigtail
14-50 to TT-30 adapter (non-standard like at EVSEadapters)
TT-30 to 5-15 adapter

DouglasR | June 29, 2013

@gimp_dad - Wonderful! You're not related to Rube Goldberg, are you? :)

Pricee2 | July 5, 2013

Has anyone actually used the EVSE NEMA 14-50 to TT-30 adapter and plug in to a 30Amp RV outlet? If so could you charge above 12Amps?
I just got one and I get a red light on the UMC when I plug it in to my 30Amp RV outlet.

Pricee2 | July 6, 2013

@gimp_dad and all. Please read my previous post.

Brian H | July 6, 2013

It happens to be on the previous page. Give a link to the page, or a page number if you want a response!

shop | July 6, 2013

@pricee2 - do you have access to an ohm meter? It would be interesting to figure out if they wired it correctly.

gimp_dad | July 6, 2013

I got an email on my 14-50 to TT-30 saying it was wired wrong and they need to rewire it. Apparently they didn't follow shop's directions properly. :-)

That could be the problem. I haven't tried mine yet. I will ohm it out and then swap the leads myself if necessary.

gimp_dad | July 6, 2013

I did Just ohm out the blades on my 14-50 to TT-30 adapter and it does have the neutral from the TT-30 connected to the "wrong" 14-50 hot conductor.

Pricee2, I would check with them to see if you got one of the few that were built wrong.

shop | July 6, 2013

Gawd, EVSEAdapters, it isn't that hard!

gimp_dad | July 6, 2013

Ok. I decided to go ahead and make my own 6-50 to TT-30 and quit being lazy. I don't have a TT-30 to try it out on but put it through a TT-30 to 5-15 adapter and it worked fine. I used the shop method of connecting 120v hot to the X terminal and neutral to the Y. Should have done it myself the first time.

Pricee2 | July 7, 2013

@shop and gimp_dad Thanks for the replies. I just metered it and it has the hot going to the Y and the neutral going to the X. So I will be calling EVSEadapters Monday.

gimp_dad | July 7, 2013

Good to know you got to the bottom of it. Thanks to shop for figuring all of this out and documenting it.

I did consider taking apart the EVSE adapter and just fixing it but disassembly looked a little complicated. Now waiting for their prepaid label so I can send it back.

I actually don't need it any more now that I have built the pigtail adapter I prefer anyway. My extension cord is 6-50 so I prefer that connector whenever possible.

shop | July 9, 2013

Btw, that's 2 for 2 ski resorts I've been to whose parking garages have had nema 5-20 plugs handy. These were probably put in for block heaters, but can be used to charge at 16A instead of the 12A Tesla's adapter gives you if you have the right adapter. If you are up for a ski week, and do only a moderate amount of local driving, then these work just fine as a charging solution.

Carmine | July 11, 2013

Shop, first of all thanks for compiling the "Model S Home Made Adapter Document". I think I'm set with my NEMA 14-30,10-30 and 10-50 adapters. But, wouldn't you know it, next month we'll be visiting a friend in Upstate NY who only has NEMA 6-50 receptacles available (other than the standard NEMA 5-15). On Amazon I found a convertible NEMA 6-50/6-30 plug which I would (8 gauge) wire to the NEMA 14-50 receptacle. I would wire hot to hot on both blades (I don't think that it matters which), ground to ground. Sounds pretty straight forward to me; but, I don't want to burn down my friend's house or blow up my Sig! Any advise from you or anyone else familiar with building these adapters would be appreciated.

shop | July 11, 2013

Yes that should work fine. Be aware that Tesla does also sell a 6-50 adapter, but you would then have to be within 20 feet of the receptacle, or buy a 6-50 extension cord, which are readily available.

Carmine | July 11, 2013

Thanks shop, I already have a 50' 14-50 extension cord and I want the ability to be more than 20' from any receptacle. I also bought a Camco RV 30M/50F adapter. As per your instructions I will cut off the 14-50 part of the adapter. When I do that will the wires be color coded (Green=ground, white=neutral, red=hot) so I'll be sure I'm making the right connections? Also, will I be able to pigtail a Camco 30F/15M adapter to the TT-30 so I don't have to carry an extra extension with me? Thanks again.

shop | July 11, 2013

I have no idea how the wires in your particular camco adapter are wired (and they could even change through manufacturing runs), so it always a good idea to use an ohm meter to determine which pins are connected to which wires.

That camco 30F/15M adapter could be used with your TT-30 adapter to plug into a NEMA 5-15 or 5-20 plug and draw 12 amps or 16 amps respectively from it. And yes, that would allow you to not have to use a regular extension cord in those cases, and you could just use your 50a extension cord.

Carmine | July 11, 2013

shop, you are absolutely the best!

dortor | July 21, 2013

pictures of all the adapters in one place hosted here:

a document discussing all the adapter's in the picture hosted here:

I do _NOT_ consider this an alternative/replacement to shop's excellent document! At most I would humbly consider it a companion to shop's document. If there are any error's or omissions I'll do my best to update the document with feedback.

shop | July 21, 2013

Cool! Love the pic and docs.At some point, I should document how I built my dual 120V adapter box for regular 120V receptacles and TT-30 receptacles. But I don't know how useful such a box is.

cybrown | August 4, 2013

I've been re-reading this thread in detail while I await my Friday delivery. It seems much of it may be moot for me since the Tesla adapters are readily available. At home I am charging from a 14-50, and on the road I will try to use public charge stations. My only concern is in visiting relatives. I assume they will have a 14-30 or 10-30 dryer plug, but it may not always be in reach of the car. I prefer to use off-the-shelf solutions rather than build my own. For the 14-30, I found this extension cord on Amazon. Any problem with using this?
I haven't found a solution yet for 10-30 installations. Anyone found an existing extension cord for these?

shop | August 4, 2013

That cord is not a 14-30 extension cord, it is for a locking connector. Finding 14-30 or 10-30 extension cords is very hard, although I remember someone finding one of them a while back. You can make your own extension cord too. That's the point of the home made adapters, you can just use a single RV 50 amp extension cord with any plug.

cybrown | August 4, 2013

Glad you pointed that out - I didn't see the 'L' before 14-30 and probably wouldn't have known what it meant anyway.