Any Solutions for 30/24 amp charging?

[strider]

30A outlets aren't as useful as you may think when traveling. Most dryer outlets aren't within reach of where you can park the car. If you have a 30A source that you would use every day at your house I would recommend the convenience of the HPWC. It's really a small expense relative to the price of the car.

Out here in California it is incredibly common for the washer and dryer to be in the garage so that 10-30 or 14-30 outlet are actually perfectly placed to charge a car. I guess I'm lucky to have 30A adapters for my Roadster and Model S (though it looks like you can still buy the entire suite of adapters for the Roadster including 6-30's).

Tesla — Universal Adapters - Available in North America Only

I wonder if the Roadster uses the same resistor settings as Model S? Since the Roadster adapters are on a pigtail to what I believe is an industry-standard connector (Leviton?), I wonder if you could hack off the end of the Model S UMC cable that goes into the wall, replace it with the Female connector that the Roadster uses and then use Roadster plug adapters? A crazy amount of work and I agree that Tesla should just make 14-30 adapters for the Model S but some enterprising person may want to give it a go.

 

[BobbyG]

Even simpler would be for Tesla to start making 14-30 UMC adapters again. Someone at Tesla reads the forums so they must see there is demand for it, and it would be safer than any of the kludges being discussed here which would benefit Tesla as well as the owners. So why aren't they?

I so agree that Tesla itself holds the answer to the simplest and safest alternative: start making the adapters again! It's more than a bit ironic that there's so much concern on Tesla's part regarding regular folks installing a fairly simple wall charging unit, however the absence of the 30 amp adapters has us all talking about inline fuses, parallel resistors, and hopes and prayers that the MS's current limiting feature doesn't reset to 40 amps on a 24 max. draw.

Tesla, the goal is to move us all ahead; please make the appropriate adapters available once again.

 

[davewill]

I suppose that some one could cut off the the whole plug and put some sort of locking plug on there that has four conductors. Then one could make adapters with the proper resisters in them. The trick would be finding a plug that can handle the current, but wouldn't fit directly into any existing wall sockets.

 

[thecloud]

I'd even stand in line to buy one.

 

[csshih]

I'd even stand in line to buy one.

I can see the media now! Tesla owners stand in line just to prevent their houses from catching fire.

 

[supratachophobia]

30A outlets aren't as useful as you may think when traveling. Most dryer outlets aren't within reach of where you can park the car. If you have a 30A source that you would use every day at your house I would recommend the convenience of the HPWC. It's really a small expense relative to the price of the car.

If there is a relative's house out of town that you visit frequently, I would suggest installing a 14-50 outlet in their garage. That's what I did.

You can make an inexpensive extension if the dryer socket doesn't reach.

 

[Snerruc]

How about buying a j1772 replacement cord for a charger and wiring it to the plug you want, then use your Tesla j1772 adapter? Car should recognize the adaptor and set to 24 amps

 

[MP3Mike]

How about buying a j1772 replacement cord for a charger and wiring it to the plug you want, then use your Tesla j1772 adapter? Car should recognize the adaptor and set to 24 amps

No, you need an EVSE between the power source and the car to handle the negotiations, etc.

And what adapter would the car recognize? J1772 can charge up to 80A and the EVSE connected to the J1772 cord is what tells the car what amperage is available to charge at.

 

[Az_Rael]

If Tesla doesn't offer an adapter by the time I get my 3, I will probably just buy one of these to use on the dryer at my mother's house

ClipperCreek | EV Charging Stations | EVSE | Electric Vehicle Charging


Her place was built in the 60s, so paying to add a 14-50 probably won't be cost effective as it might involve a panel upgrade.

 

[mspohr]

Is there some type of trademark or copyright issue if someone were to reverse-engineer the UMC adapters and manufacture them? Is there a safety or UL-listing issue?

I believe the UMC and HPWC use standard J1772 signaling (pulse width) for charging current which is well documented.
SAE J1772 - Wikipedia, the free encyclopedia

 

[BobbyG]

Just as an update to this thread, I was able to purchase a 10-30 adapter from a service center in AZ and have it shipped. I am now able to build a series of extension cords based on either 14-50 or 10-30 adapters on the UMC end with a variety of 50 and 30 amp plug options that will be limited to amp-appropriate draws. Another service center told me that lack of interest caused the discontinuation of the 10-30's, however he did agree with the potential problems associated with relying on the MS to limit the current described in this thread and previously stated very well by FlasherZ. Let's hope that the volume of requests will help change their mind.

 

[tga]

I saw these numbers on the forum a couple of years ago and saved them, but don't know if they're accurate.
40A - 9.08k ohms
24A - 33.16k ohms
16A - 75k ohms
12A - 140k ohms

I measured, they're correct. I'm adding this datapoint to every thread where I see this table -

32 amps - 20k ohms (measured from a Canadian 14-50 adapter)