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What happens is the vampire draw is taken from the 12V battery which is periodically recharged from the traction battery. This cycles the 12V battery several times a day which wears it out until it dies.I thought that the vampire draw talked about in the forums is usually on the main battery that powers the motor not the 12v battery
@thimel - That's counterintuitive. You probably know more than I have been able to dig up thus far. But it doesn't make design sense to me to draw from 12v battery and then charge it from the main battery. Plus the same issue should have happened with my S but its been 18months on that and the 12v battery is working fine. The differences between the two cars are what I mentioned in my original post.What happens is the vampire draw is taken from the 12V battery which is periodically recharged from the traction battery. This cycles the 12V battery several times a day which wears it out until it dies.
@thimel - That's counterintuitive. You probably know more than I have been able to dig up thus far. But it doesn't make design sense to me to draw from 12v battery and then charge it from the main battery. Plus the same issue should have happened with my S but its been 18months on that and the 12v battery is working fine. The differences between the two cars are what I mentioned in my original post.
@K-MTG - Cap Sunshade ..I haven't called in yet due to the weekend but anyways the 12k service is also due. And yeah the car is working fine with that notification on the dash.
And no I wasn't going to disconnect the dashcam+mifi setup they both get power from the source on the left side of the driver footwell. If they want to blame that, they will need to prove it. It cannot be 100% just those two- I think the seat heaters and type of usage matters. 12v batteries aren't expensive to replace. I don't expect them to make a stink about it at least this time. After all they gave me an extra sunshade last summer (not kidding )
My S needed a new battery after 9 months. YMMV. It takes significant power to run the D.C. To D.C. Converter and monitor it with all the computers. Hence they don't leave it running all the time. There are old threads with lots of information. Search is your friend.@thimel - That's counterintuitive. You probably know more than I have been able to dig up thus far. But it doesn't make design sense to me to draw from 12v battery and then charge it from the main battery. Plus the same issue should have happened with my S but its been 18months on that and the 12v battery is working fine. The differences between the two cars are what I mentioned in my original post.
@K-MTG - Cap Sunshade ..I haven't called in yet due to the weekend but anyways the 12k service is also due. And yeah the car is working fine with that notification on the dash.
And no I wasn't going to disconnect the dashcam+mifi setup they both get power from the source on the left side of the driver footwell. If they want to blame that, they will need to prove it. It cannot be 100% just those two- I think the seat heaters and type of usage matters. 12v batteries aren't expensive to replace. I don't expect them to make a stink about it at least this time. After all they gave me an extra sunshade last summer (not kidding )
@thimel - my apologies if it sounded like I was disputing your post..it's just that the whole concept of having a 12v battery seems insane and on top of it this 12v battery renders the car useless lol when you have a perfectly charged bigger batteryMy S needed a new battery after 9 months. YMMV. It takes significant power to run the D.C. To D.C. Converter and monitor it with all the computers. Hence they don't leave it running all the time. There are old threads with lots of information. Search is your friend.
@thimel - my apologies if it sounded like I was disputing your post..it's just that the whole concept of having a 12v battery seems insane and on top of it this 12v battery renders the car useless lol when you have a perfectly charged bigger battery
No offense taken. I was just explaining why it is the way it is.@thimel - my apologies if it sounded like I was disputing your post..it's just that the whole concept of having a 12v battery seems insane and on top of it this 12v battery renders the car useless lol when you have a perfectly charged bigger battery
This makes no sense, unless that agent thought you were talking about the high voltage battery. I changed mine myself, but I had to get it from tesla. It did not have standard (battery post) connections.... the agent said that only Tesla can replaced a battery.
I am using TeslaFi; default sleep settings.I had the battery in my old S fail at 1 year. Haven’t done enough digging to look for a correlation but those who have it die are you using 3rd party data logging where the car is woken up often or just never gets to deep sleep? I was during that first year but stopped after the battery replacement.
It is required for safety, you can't have 400V available all the time, so there are big contactors in the HV battery to cut power from the rest of the car. once the HV battery turns off you have to have power from somewhere to power the electronics and ask the HV battery to turn back on. Almost all EVs still have a 12V battery.
Just because you're drawing power from the main pack doesn't mean you have to have 480V going to the car. The individual cells are what, 1.2 volts? Deriving a 12V feed from a subset of the pack ought to be downright trivial in any number of ways, from adding extra taps on the pack to adding switched mode regulators that get driven by 400V through an extremely low amperage fuse, or a combination of the above. I'm not convinced that such a design would really be a safety problem....