-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
davewill
Active Member
DMC-Orangeville
Audi eTron & John Deere 5100E
May have something to do with CEC requirements limiting it to 32 amps. See this quote/feed: Southern Ontario Tesla Owner's Club - Page 25
You're kidding, right? You're an owner and have over 1000 posts and don't know what the UMC is used for?
The catch is, it only charges with 32A max, so weaker than the previous that could charge with 40A.
green1
Active Member
Guess those old 14-50 adapters are now going to be worth their weight in gold...
Unfortunately I highly doubt I'll get the old one, it's a shame to be limited to even slower charging than you have to. Why 32 amps anyway? I thought it was supposed to be 80%, that's 40A on a 50A outlet, 32 is way down at 64%!!!!
Unfortunately I highly doubt I'll get the old one, it's a shame to be limited to even slower charging than you have to. Why 32 amps anyway? I thought it was supposed to be 80%, that's 40A on a 50A outlet, 32 is way down at 64%!!!!
mknox
Well-Known Member
For clarity, are you guys talking about getting a whole new UMC or just the NEMA 14-50 adapter plug? I received a new NEMA 14-50 adapter at least a year ago with instructions to return the old one (I never did).
I got a whole new UMC plus a new NEMA 14-50 adapter. Supposed to send back the old version of both.
The new adapter with new UMC limits charging to 32A, while the new UMC with the old adapter still charges with 40A.
mknox
Well-Known Member
mknox
Well-Known Member
Have you tried the reverse? i.e. the new adapter on the old UMC? If so, does it limit it to 32 amps? Just wondering if the "intelligence" is in the UMC or the adapter. If the adapter, I wonder why they would be sending out whole new UMC sets?
green1
Active Member
Best guess, based on the fact they're now derating the energy use to 64% instead of the usual 80%, is that they discovered that the UMC wasn't really capable of safely maintaining 40 amps long term. I suspect they made a safety change to the UMC, and also sent a new adapter that lowers the amperage to 32A
So I bet the new adapter is what sets the rate, but that the new UMC is more reliable. It's also possible that the 32A setting didn't exist in the old UMC, so the new adapter may not be enough to set an old UMC to 32A, it may get confused.
Canuck
Well-Known Member
I doubt it. I order stuff from Tesla online and have it shipped to my PO Box in the States because the shipping price to Canada is insane. So all you need to do it order one from the US site and have it shipped to the States so they give you the American version of 40 amps, and make sure your specify TESLA PN: 1014324-00-E (US)
Tesla Accessories and Charging Adapters NEMA 14-50
Someone just needs to tell us if the old adapter on the new UMC still gives 40 amps?
So to answer my own question - this appears to be the cable and connectors that you use to attach to your regular household 120V and 240V plug. I have used this cable exactly once in my 9 months of Tesla ownership - when I was worried that I might not make it home and charged at 120V, 12A for a few hours in the dead of winter.
Similar threads
