Just want to make sure they weren’t being phased for a reason that would discourage me from buying one. Like spontaneously causing a fire or battery degradation...
-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
Tesla Replacing Gen 1 UMC with Gen 2 UMC
- Thread starter S100D
- Start date
Perhaps an issue for newer cars.
Only listed as S/X
Perhaps convergence of newer S/X and model 3 hardware.
Only listed as S/X
Perhaps convergence of newer S/X and model 3 hardware.
The 40amp they have now appears to be a hardwired NEMA 14/50 gen2 style. (No adapters)
Model S/X Corded Mobile Connector
Model S/X Corded Mobile Connector
Definitely not. They replaced the UMC after the first year of production. After that the UMC has basically not changed in 3 years. Thousands of people are using their UMC daily and no issues.
TonyWilliams
Active Member
As somebody who has purchased close to 1000 of the Tesla GEN1 UMC, I can offer that they have a horrific failure rate for modern electronics. I have boxes full of failed GEN1 units. Maybe I will sell boxes of smoked UMCs on eBay some day.
While I can’t say the GEN2 is perfect (I already have one GEN2 failure, so I’ll be hacking that unit open), they certainly addressed many of the failings of the GEN1:
1) GEN1 had no thermal monitoring in the wall plug end; GEN2 does
2) GEN1 would melt its UMC plug receptacle; GEN2 is well designed
3) GEN1 didn’t fit flat on the wall; GEN2 has well designed 90 degree plugs that fit flush on the wall
4) GEN1 didn’t have vehicle side temperature monitoring until the very end; GEN2 does
5) GEN1 failed internally, and they potted the entire assembly during manufacture; GEN2... don’t know yet
As to the maximum of 40a versus 32a, that’s a toss up. I’m not really sure why they did that, however we know they were limited to 32 amps in Canada. Probably just to make them all common? I’m sure the failure rate goes WAY down at the lower power setting.
While I can’t say the GEN2 is perfect (I already have one GEN2 failure, so I’ll be hacking that unit open), they certainly addressed many of the failings of the GEN1:
1) GEN1 had no thermal monitoring in the wall plug end; GEN2 does
2) GEN1 would melt its UMC plug receptacle; GEN2 is well designed
3) GEN1 didn’t fit flat on the wall; GEN2 has well designed 90 degree plugs that fit flush on the wall
4) GEN1 didn’t have vehicle side temperature monitoring until the very end; GEN2 does
5) GEN1 failed internally, and they potted the entire assembly during manufacture; GEN2... don’t know yet
As to the maximum of 40a versus 32a, that’s a toss up. I’m not really sure why they did that, however we know they were limited to 32 amps in Canada. Probably just to make them all common? I’m sure the failure rate goes WAY down at the lower power setting.
Yes I did. It seems an exception. I have not heard from anyone one else getting a call from Tesla to replace the UMC. Maybe the logs from his car say there is a problem with the UMC and since Tesla needs to replace it but only has the new ones that’s what they do. If there was a general issue with the old 40 Amp UMC we would hear a lot of people post about it.
I think it is well known that the UMC did get hotter at 40A. In general 30-32A has become the de-facto standard for level 2 anyway. Think of old RV park circuit breakers for example.
Jsilva
Member
Thanks,
So this looks like a gen2 style 40AMP Charger with a dedicated 14/50 plug.
What’s your evaluation of this? GEN2 benefits beyond flat plug?
Model S/X Corded Mobile Connector
Last edited:
Thanks for your insight Toni! Much appreciated. Since the new UMC has not been out for long while the old one has been out for 5 years I think we have to wait and see if the new ones actually has a lower failure rate or not.
A more robust discussion of reasoning behind move from 40a to 32a and failure rates...
New UMC 14/50 limited to 32 amps... WHY?!
New UMC 14/50 limited to 32 amps... WHY?!
I was the one that started this thread because the SC call me and told me that they were going to bring out a Gen 2 UMC to replace my Gen 1 UMC. They may have gotten confused because they ordered a replacement driver seat fo me. I went in today to get the seat replaced and asked them about it, and they were not aware why they called me about the Gen 2 UMC.
I asked them if there was a recall on the Gen 1 UMCs and they said no. I don't think that there is any additional news on this subjec.
Isn't that funny! One misunderstanding caused this whole conspiracy about how bad the old UMC is, a danger and what not 
The melting adapters were replaced almost 2 years ago and the issue is fixed. The UMCs work just fine. Don't leave them outside when it's wet or rains. It will go bad! It won't melt, it won't blow up. Thousands of people us it every day without problems.Mine has charged my car at 40 Amps every day for years. Never a problem, never got hot, never caused issues.
The new gen 2 was most probably reduced to 32 Amps to save cost and make the wall connector a better alternative. My Models has a 40 Amp charger. NEMA 14-50 is designed to deliver 40 Amp continuously. The charger in my car is most efficient at 40 Amps. There is no reason or advantage to switch down to 32 Amp.
The melting adapters were replaced almost 2 years ago and the issue is fixed. The UMCs work just fine. Don't leave them outside when it's wet or rains. It will go bad! It won't melt, it won't blow up. Thousands of people us it every day without problems.Mine has charged my car at 40 Amps every day for years. Never a problem, never got hot, never caused issues.
The new gen 2 was most probably reduced to 32 Amps to save cost and make the wall connector a better alternative. My Models has a 40 Amp charger. NEMA 14-50 is designed to deliver 40 Amp continuously. The charger in my car is most efficient at 40 Amps. There is no reason or advantage to switch down to 32 Amp.
TonyWilliams
Active Member
Isn't that funny! One misunderstanding caused this whole conspiracy about how bad the old UMC is, a danger and what not
The melting adapters were replaced almost 2 years ago and the issue is fixed. The UMCs work just fine. Don't leave them outside when it's wet or rains. It will go bad! It won't melt, it won't blow up. Thousands of people us it every day without problems.Mine has charged my car at 40 Amps every day for years. Never a problem, never got hot, never caused issues.
The new gen 2 was most probably reduced to 32 Amps to save cost and make the wall connector a better alternative. My Models has a 40 Amp charger. NEMA 14-50 is designed to deliver 40 Amp continuously. The charger in my car is most efficient at 40 Amps. There is no reason or advantage to switch down to 32 Amp.
While your singular experience is great, sadly, the newer wall plugs can still melt at the plug.
Again, I’ve handled more than one.
TonyWilliams
Active Member
They fixed the number one warranty issue with the GEN1 UMC.
Here’s a link to the GEN2 opened up for all to see:
https://teslamotorsclub.com/tmc/posts/2633429/
Similar threads
