For those in the SJ/Bay Area CA who have purchased this battery for their Roadster, where did you buy it? I want to change mine out this weekend, and am looking for a place I can just go pick one up. Thanks!
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Four days ago with much appreciated help from @markwj I was able to set up OVMS on my Roadster (Thank you Mark!). I will post the details of that in a separate post on the OVMS thread. Today, I just got this alert!!! about 12V battery critical (11.3V, ref - 13.0V). The main battery is at 85% with 160 miles ideal range. The outside temperature is 31 F (cold and windy, brrrrr). The car had been parked for 2.5 hours when I got the alert. Annual service at Tesla was done 2 months ago.
QUESTIONS: Should I ignore this? Should I be concerned? Without OVMS would I even know this? Is it possible that OVMS vampire drain has caused this? I see above that this battery is supposed to be replaced every 2 years -- is this true? If yes, why didn't Tesla suggest this? Thank you in advance. I love this Tesla and Roadster community.
PS- I enjoyed meeting @Botbldr45 and his wife in Sedona over Thanksgiving and seeing all the cool modifications he has made to his car!
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Mmmm, main pack, really? When the car is on (key in, turned past Acc to On), or charging, then yes. The 12v side will be driven by the DC-DC converter from the high voltage side. But when it's off, the main contactors are not engaged, so I believe the only source of 12 volts is the little 12v battery on the 2.x cars (which her Sig says she has), even if the car is plugged in. So, I think MLAUTO is more likely correct, and that the 12v battery is likely a bit weak.
Thank you for the responses, yes it is a 2.0. I will monitor (and I guess so will OVMS). Since the car itself did not alert me with a VDS alert, if this single OVMS alert is predictive of near future issues, then it shows the value of the OVMS monitoring. Its kind of like molecular screening tests for early detection of cancer.
I have another question--let's say I do need to replace it. Can I trust this to my local NTB (National Tire & Battery) store (they put on my winter tires last month so they have worked with the Roadster) or would it be most prudent to take it to Tesla Service Center (about 1 hour away from me)?
Also make sure they know how / where to jack up the front of the car to remove the tire. Really bad thing will happen if they don't do it right.Replacing the 12v battery is really simple so I wouldn't worry about a third party doing it, although you will probably have to show them where it is located at.
Ha. Learned something new today, thanks!The standby power (12v from the dc/dc converter inside the ESS) runs to both the switchback and the VMS, as does the 12v from the aux battery. The lines are separate from each other so it depends where the OVMS gets its 12v reading from. I would think 11.3v for the standby power would be low as well, since the standby converter is fed from full pack voltage, and is always powered even when the car is asleep.