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JeffK
Well-Known Member
I know this is slightly unrelated, but I have a Prius with a cigarette lighter receptacle that loses power when the car turns off too.
It's kind of a standard practice to make sure you don't drain the battery.
It's kind of a standard practice to make sure you don't drain the battery.
JamesG
Member
I am struggling with the same issue but withe the 12volt cigarette lighter.
I am putting together an auxiliary battery system to solve the problem
JeffK
Well-Known Member
I'm not a smoker, but I'd imagine a disposable lighter might be cheaper.
JamesG
Member
You missed the point. I want the cicarette lighter to be on so I can run my refridge.
cantdecide
Member
JamesG
Member
In my X it shuts off sometimes when the car locks. Sometimes a few hours later. Never stays on till the next morning. Maybe it has to do with the voltage of the Tesla 12v battery. So if I leave the refridge on and the Tesla 12 v battery voltage drops, tha
JeffK
Well-Known Member
Ah, so you mean the receptacle not the lighter itself. If you connect the battery to be charged by the alternator then unless you have some kind of switch to isolate the circuit when you shut off the car you'd probably still end up draining your primary 12v battery. If you don't have it charge via the alternator then your aux battery will drain fairly quickly and you'll be left with warm beer... err fridge contents. I'd be interested to see what you come up with.
goneskiian
Active Member
JeffK
Well-Known Member
haha I didn't think he was referring to a Model XYou have an alternator in your X?
Same thing would apply in an X sans the alternator though... if you connect the 12 V batteries in parallel so they can remain charged you'd still have to disconnect the aux one to not drain the primary 12V
JamesG
Member
I understand about a cutout relay when the tesla is off. I still think that connecting the 2 batteries in parallel could be a problem. I don't understand the electronics of the tesla 12 v charging system. Possibly the increase of resistance of 2 parallel batteries would fool the tesla charging system and cause a problem.
JamesG
Member
systemcrashed
Please Reboot
JamesG
Member
systemcrashed
Please Reboot
Are you only getting abou 5-6hrs of auxiliary cooling with that setup? Does the fridge run continuously or intermittently, I'm curious how long will it keep things cool?
JamesG
Member
The fridge is on intermittently. Depends on the setting on the fridge/freezer and the temp in the car. Draws between .5 and 2 amps. I expect to get 24 hours. I'll let you know after I live with it for a while
goneskiian
Active Member
It is my understanding that when the 12v battery's charge drops low enough it is simply recharged by the main pack.
I know Inread that somewhere on here. Perhaps someone with more knowledge of how this works will chime in.
