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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?

@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?

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.

@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.......


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...

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

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.

It is now available in the Tesla online store.

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

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).

They just called back and both items are in.

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.

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

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.

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.

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).

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

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.

@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...

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:

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:

@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.

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.



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.

$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.

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.

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

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

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

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

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.

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