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12 Volt Always On for Small Freezer

SkiTrak

Member
Jul 10, 2016
19
7
Denver, Colorado
I got a 12 volt portable freezer for when I go to Cosco and won't get home for a while. It is fused for 15 amps. I can use the 12 volt cigarette lighter plug but it powers down when the car is off. I am looking for a place to tap 12 volts that is not switched. I noticed the power seats are fused at 30 amps and I was thinking since you rarely move the seat that would be a good source of power. Anyone have any thoughts on this.

I was also thinking of putting the car in camping mode, would that leave the power on the 12 volt cigarette lighter plug?

I know some people use the power lift gate but I am concerned if you open the lift gate while the compressor is running you might blow the fuse.
 

BerTX

Supporting Member
May 2, 2014
3,505
3,566
Texas/Washington
Leaving the car in camper mode will not keep the 12v plug active.

What year is your vehicle? Older MS's can be modified fairly simply to keep the plug powered, but not since about 2016.

Sorry, I don't know about where it can be tapped. I got power from the OBDII plug, but that was just for electronics, not a heavy load. I don't know how big the fuse/wiring is for that.
 
  • Helpful
Reactions: scottf200

doghousePVD

My grandfather’s car
Dec 3, 2018
625
492
New England, USA
My solution is a large Yeti cooler. Stuff keeps frozen for days. Way better than a cheap mass market cooler.

My experience with little camper refrigerators has been generally poor. BTW, they are horribly inefficient.
 

JzCastle

Member
Aug 22, 2017
46
116
Helsinki, Finland
Get a "OBD-2 cigarette lighter/car DC power connector".
OBD-port has power always available. I have had my dashcam connected to it for almost two years with no problems.
 

scottf200

Active Member
Feb 3, 2013
3,960
3,632
Chicagoland ModelX S603
I got a 12 volt portable freezer for when I go to Cosco and won't get home for a while. It is fused for 15 amps. I can use the 12 volt cigarette lighter plug but it powers down when the car is off. I am looking for a place to tap 12 volts that is not switched. I noticed the power seats are fused at 30 amps and I was thinking since you rarely move the seat that would be a good source of power. Anyone have any thoughts on this.

I was also thinking of putting the car in camping mode, would that leave the power on the 12 volt cigarette lighter plug?

I know some people use the power lift gate but I am concerned if you open the lift gate while the compressor is running you might blow the fuse.

I keep my 12v fridge on in my X just by having Sentry Mode on. This is a side effect of SM.
 
  • Informative
Reactions: BerTX

BerTX

Supporting Member
May 2, 2014
3,505
3,566
Texas/Washington
Get a "OBD-2 cigarette lighter/car DC power connector".
OBD-port has power always available. I have had my dashcam connected to it for almost two years with no problems.
Certainly a possibility, but there is a BIG difference between running a dashcam drawing a few hundred milliamps and a 15 amp freezer.
 
  • Informative
Reactions: scottf200

Kurtbe

Turning a 2017 S into a 3*** Hotel
Jun 19, 2019
59
19
Ghent/Belgium
I 've been looking at a solution, but found nothing better than changing the ODB2 fuse to 10 Amps (my fridge - custom built- is 9 Amps). Other than that, one could go through the firewall and draw current straight from the 12V battery.
 

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