HPWC / UMC2 to Roadster adapter

[wiztecy]

I've charged off the one HPWC at Santana Row, the 1st one as you come in on left. It only outputs @ 40Amps max. Don't know if the rest are like that, but I believe so.

As for the J1772 to Model-S adapter, sounds good but I believe its unrealistic in terms of how many would be made/sold. I'm sure the cost to prototype and finally make it is the highest part of the adapter cost. The CAN Jr/J1772 is already out there for the the majority of the Roadsters who're aware of such an item. Another revision wouldn't have that much of a customer base to justify the cost. Both adapters can already fit between the 2 Roadster seats, its a very small footprint.

 

[augkuo]

The J1772 to model s connector that comes with the car is pretty
small and light - it'll fit in the same bag as the model s to roadster
connector. They would be put in series for a J1772 to roadster connection.

I've charged off the one HPWC at Santana Row, the 1st one as you come in on left. It only outputs @ 40Amps max. Don't know if the rest are like that, but I believe so.

As for the J1772 to Model-S adapter, sounds good but I believe its unrealistic in terms of how many would be made/sold. I'm sure the cost to prototype and finally make it is the highest part of the adapter cost. The CAN Jr/J1772 is already out there for the the majority of the Roadsters who're aware of such an item. Another revision wouldn't have that much of a customer base to justify the cost. Both adapters can already fit between the 2 Roadster seats, its a very small footprint.

 

[djp]

Model S to Roadster adapter

As for the J1772 to Model-S adapter, sounds good but I believe its unrealistic in terms of how many would be made/sold. I'm sure the cost to prototype and finally make it is the highest part of the adapter cost.

Not a new adapter. In theory you could take a CAN SR and mate it with the J1772 adapter that comes with the Model S. This would let you charge a Roadster from a J1772 station without needing to carry a CAN JR. It would probably introduce a whole new set of compatibility problems though.

 

[bonnie]

Not a new adapter. In theory you could take a CAN SR and mate it with the J1772 adapter that comes with the Model S. This would let you charge a Roadster from a J1772 station without needing to carry a CAN JR.

What am I missing? Wouldn't that then require you to carry the J1772 that comes with the Model S? I don't see a space savings there.

If you're just trying to minimize adapters that you own, you could ... but wouldn't you want to keep that adapter in the S, in case you needed it?

 

[djp]

Model S to Roadster adapter

What am I missing? Wouldn't that then require you to carry the J1772 that comes with the Model S? I don't see a space savings there.

It's smaller than the CAN, but agreed you wouldn't be saving a lot of space - the CAN is pretty small as is. It'd be cool to see this work though.

 

[wiztecy]

I see now, thanks for the clarification. Its $95 for the adapter:

Tesla Gear Shop SAE J1772

 

[Curt]

Thanks, Henry - this thing rocks!

Charging at the Tesla Gallery Montgomery Mall in Bethesda, MD. Getting 203V/70A from an 80A HPWC. The Gallery staff couldn't believe it.

This is going to make road trips much easier...

 

[Curt]

OK!

Now that I have this working, a quick question...

It seems to me that the Model S UMC packs smaller and lighter than the Roadster UMC, though I haven't had the opportunity to compare them side-by-side so far.

Could someone confirm the size/weight difference?

If I got one of the Model S units, could I reclaim some of my precious trunk space on long trips?

 

[AEdennis]

Curt. Confirmed. I use the original CAN from hcsharp coupled with a Jesla (J1772 Model S UMC) from TonyWilliams. Lighter, and less space than either the MC240 or Roadster UMC.

 

[Doug_G]

Yes, the Roadster UMC when packed is about 5X as large as the Model S UMC, mainly because of the bulky inch thick cables used. Not to mention the plug adapters which are about 20X the size of the Model S plug adapters (the connector on the end of the Roadster adapter is about the size of the entire Model S adapter).

 

[wiztecy]

How is the efficiency comparison of the Model-S to Roadster UMC? Since the cable, I presume copper too is smaller, there's some losses. Curious if it takes any longer to charge. I hope the Model S UMC is more robust than the Gen 2 Roadster UMC.

 

[AEdennis]

With my setup (using original CAN and Jesla) it charges at the same speed regardless of which UMC I use. (Tested on four 240V 40A sockets, (home and office) (3 NEMA 14-50 and 1 NEMA 6-50).) Any differences are negligible.

 

[wiztecy]

Thanks! My guess most of the inefficiency of the smaller gauge wire is lost though heat. Would be interesting to measure at the 14-50 outlet with both, then compare the energy in with the energy out.

 

[djp]

If I got one of the Model S units, could I reclaim some of my precious trunk space on long trips?

My thought exactly, the Model S UMC is tiny compared to the Roadster UMC. My plan is to buy one from Tesla once my adapter arrives, to save trunk space on road trips and as a long term backup to my Roadster UMC.

 

[Doug_G]

How is the efficiency comparison of the Model-S to Roadster UMC? Since the cable, I presume copper too is smaller, there's some losses. Curious if it takes any longer to charge. I hope the Model S UMC is more robust than the Gen 2 Roadster UMC.

If there were significant losses then the thing would get really really hot, and it doesn't. They've sized the wiring large enough to handle the current. The Roadster UMC cables are very conservatively designed.

Incidentally, Tesla did a little trick that I'm not sure they would get away with if it were UL listed. They use two separate wires per phase, in parallel. No doubt this really helps with the flexibility of the cable.

 

[hcsharp]

Not a new adapter. In theory you could take a CAN SR and mate it with the J1772 adapter that comes with the Model S. This would let you charge a Roadster from a J1772 station without needing to carry a CAN JR. It would probably introduce a whole new set of compatibility problems though.

Well said (bold emphasis mine). You're on your own if you want to try stacking the two adapters on top of each other. It's hard enough to support this thing the way it is without introducing a new set of potential issues. If it works, great. If not, I apologize ahead of time for not being able to provide any support. The size and weight savings will be minimal. I won't be trying it myself for several reasons, one of which is the fact that stacking adapters places the connector a little too far out from the car for my liking. If there's a problem, I won't know which adapter to start troubleshooting.

One of my testers tried it and said it didn't work after a couple of tries. But I see no reason why it wouldn't work so it may have been something unusual. Good luck.

Disclosure: I may have a potential conflict of interest in that I also sell J1772 adapters (Can JR) for the Roadster.

 

[TOBASH]

Well said (bold emphasis mine). You're on your own if you want to try stacking the two adapters on top of each other. It's hard enough to support this thing the way it is without introducing a new set of potential issues. If it works, great. If not, I apologize ahead of time for not being able to provide any support. The size and weight savings will be minimal. I won't be trying it myself for several reasons, one of which is the fact that stacking adapters places the connector a little too far out from the car for my liking. If there's a problem, I won't know which adapter to start troubleshooting.

One of my testers tried it and said it didn't work after a couple of tries. But I see no reason why it wouldn't work so it may have been something unusual. Good luck.

Disclosure: I may have a potential conflict of interest in that I also sell J1772 adapters (Can JR) for the Roadster.

Henry,

I PM'ed you about my CAN Sr. a few times... No response.

Not sure if you're getting the messages though, as in the past you have said your mailbox gets full and overflow messages get lost..

Best,

T

 

[supersnoop]

Well said (bold emphasis mine). You're on your own if you want to try stacking the two adapters on top of each other. It's hard enough to support this thing the way it is without introducing a new set of potential issues. If it works, great. If not, I apologize ahead of time for not being able to provide any support. The size and weight savings will be minimal. I won't be trying it myself for several reasons, one of which is the fact that stacking adapters places the connector a little too far out from the car for my liking. If there's a problem, I won't know which adapter to start troubleshooting.

One of my testers tried it and said it didn't work after a couple of tries. But I see no reason why it wouldn't work so it may have been something unusual. Good luck.

Disclosure: I may have a potential conflict of interest in that I also sell J1772 adapters (Can JR) for the Roadster.

Any idea what the size difference is between the Can JR and Tesla's S/J1772 adapter? Buying the Can SR and the Tesla adapter would be about $500 less expensive than buying both Cans, but it doesn't sound like it would be worth it.

 

[AEdennis]

Any idea what the size difference is between the Can JR and Tesla's S/J1772 adapter? Buying the Can SR and the Tesla adapter would be about $500 less expensive than buying both Cans, but it doesn't sound like it would be worth it.

I would guess that the CAN JR is approximately 2.25x larger than the Tesla S/J1772 adapter. It is probably 4x heavier. The build quality on the CAN JR is superb. Looking forward to the CAN SR; however, since we pretty much stay around home, have an MC240, Roadster UMC, and the aforementioned CAN JR/JESLA combo, I've asked Henry to feel free to prioritize those that are desperate to get their CAN SRs.

The CAN JR is a very nice neoprene bag that protects the adapter from banging around.

 

[bonnie]

Any idea what the size difference is between the Can JR and Tesla's S/J1772 adapter? Buying the Can SR and the Tesla adapter would be about $500 less expensive than buying both Cans, but it doesn't sound like it would be worth it.

The size of the CAN Jr / Sr is comparable to the size of a small telephoto lens. I keep each of mine in one of these, perfect fit, extremely well protected: