mknox
Well-Known Member
199 volts is within the normal operating range of a 208 volt circuit. Not sure if that 14-50 was on a 120/208 volt or 120/240 volt system, but in any case, the car should be able to accept 199 volts.
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Firmware 5.8.4
- Thread starter bluetinc
- Start date
199 volts is within the normal operating range of a 208 volt circuit. Not sure if that 14-50 was on a 120/208 volt or 120/240 volt system, but in any case, the car should be able to accept 199 volts.
InTheShadows
Active Member
I think 187 is the bottom of the normal range for 208. Tesla May have used the 3% voltage drop rule though which may be the issue. Or it could have been a 240v circuit.
Yeah. I am currently on a road trip where charging is difficult and mileage is Terrible. It is absolutely critical that I do not install this update. The public chargers I used have a wide range of actual voltages and a lot of fluctuation. They are of course perfectly safe.
There should never be updates where it is vital to NOT install them. This is gross incompetence on the part of tesla. Again.
We, Model S owners, really need to clarify when it is appropriate for Tesla to make updates that impact our ability to use our cars as purchased. There seems to be a troublesome trend, of late, of pushing downloads that many of us personally deem reactionary. I would propose that all future updates be fully disclosed, as to the content and purpose, with the ability of the owner to opt out.
Alas, it appears that our "Big Brother" is overly protective at times.
I disagree. Precisely because I was plugging into a previously untested NEMA 10-30 dryer outlet at my parent's house, I wanted this firmware. If there was anything that could present a problem, I would rather it back off automatically if it could. If the wiring and transformers were perfectly safe and within proper specs, there wouldn't be a wide range of voltages and a lot of fluctuation. Charging at above 24 amps on a 30 amp circuit is just playing roulette. Why should a mass produced product do that?
I understand that perspective, but what Tesla is up against here does perhaps justify unusually aggressive damage control. One more road debris/puncture related fire or another electrical fire (caused by house wiring or the car) could be a branding disaster and do long term damage to Tesla and the EV movement. The steps Tesla is taking are more drastic and precautionary than usual, but seriously, given the potential consequences, it's understandable and likely justified. Tesla needs a nice long stretch of good news and no calamities to get back in full swing. The inconvenience that these adjustments are causing is nothing compared to what a crash in consumer demand could mean to all of us in the long run.
Had another new firmware glitch on the weekend. I would enter a GPS destination, and it would immediately pop the directions up on the display. About 2 seconds later they would quietly vanish!
This was 100% repeatable every time and no matter what destination I entered. Fixed by rebooting the touchscreen. Annoyingly it took 15 minutes for 3G to come back and I kinda needed the GPS map!
This was 100% repeatable every time and no matter what destination I entered. Fixed by rebooting the touchscreen. Annoyingly it took 15 minutes for 3G to come back and I kinda needed the GPS map!
I wish I knew... it's at my mom's, I'll take a look next time I'm there.
Can the car somehow detect whatever effect a too small (big) gauge cord would have?
Yes, it measures the voltage as it ramps up the current from the EVSE and can thereby determine the total resistance of the AC feed. If the voltage drop is too high it either charges at very limited current or not at all. Don't know what the exact criteria were before the most recent software update nor what they might have been changed to recently, but that explains how some users have reported getting no or very slow charges when using undersized extension cables or poor wiring connections.
InTheShadows
Active Member
I agree. The voltage and amperage we are talking about can easily start a fire for any number of reasons. Detecting voltage fluctuations and drops and reducing or stopping the load will dramatically reduce the risk of fire.
If the wire path was installed correctly and is in good repair there should be no problem and you will get full charging.
If you are not getting a full charge then the owner, utility, and/or an electrician needs to be called and made aware of the problem.
How exactly do you know this? This is exactly how mis-information starts. One example is charging with the UMC while it's in the sun. There is a temp sensor which will cut back charging even though the ambient temp is in the 60's F. That is a crappy design, that shouldn't be the customers problem. The clipper creek units do not do this, they sit outdoors, and charge up to 80A.
The sensor(in the brick) has nothing to do with the UMC melting problems. The melting problems seem to stem from the 40A adapters not being seated all the way up on the undersized pins of the UMC adapter end. I have had no problems since making sure the adapter is fully pressed up against the UMC end.
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