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What is the expert opinion on using just UMC in your personal garage rather than mounting a HPWC if you do not have dual chargers and only plan to charge at 40A?
Any pros and cons you can suggest to help make the decision easier?
thanks,
-OL
The vast majority of Tesla owners use the UMC. I use the UMC, but decided to buy a second UMC to always leave in the car (since my brain is a sieve). The HPWC is more robust and built better than the UMC - some small minority of UMC owners have had overheating problems with their UMC - the odds of having a problem with an HPWC is far less.
Concur. I use my UMC daily, but am on my third replacement. I was considering a second UMC so I could leave one in the car, but for $100 more, I think I'll go for the UMC even though I only have a 50 amp circuit in the garage.
Receptacles are good for at least 100 cycles.
Either way it is better on the home electrical to not place unnecessary stress on it when 20-30 amps of charge current will do the job just fine. That is, it will require more maintenance to operate the HPWC at 80 amps or the UMC at 40 amps on a NEMA 14-50 for daily charging and the high current charging is of no actual advantage.
True!...
The bottom line is that the UMC is perfectly fine for everyday charging use up to a full 40amps without any added concern. The HPWC has a few benefits over the UMC, but is not required unless you need the faster charging and have dual chargers.
This doesn't make sense. If a NEMA 14-50 circuit is properly wired and the main panel can support the extra amperage, there's no "extra stress" placed on the system between using 30 amps versus 40. I don't understand what "more maintenance" would be required charging at 10 additional amps.
You are correct, of course. However my own experience suggests it is a good idea to periodically check all electrical connections. Particularly in humid environments corrosion can interfere even with tight connections. Vibration also does the same.True to a point. Traditionally, outlets like this powered intermittent loads like stoves, RV trailers and such. EVs present a continuous, high current load that can present more of a challenge for loose connections, dirty blades on the plug and so forth. Also, periods of continuous load will generate more heat, and repeated heating and cooling cycles can eventually lead to the connections loosening inside. It's a good idea every now and then to kill the power and check that the screws holding the conductors are torqued down tightly.