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Teslab workaround for 12v charging

Zachb1

Member
Jul 20, 2021
10
0
Los Angeles
I have a fridge that pulls 30 watts in my MYLR. It’s pretty awesome, always have cool beverages or frozen storage.

I understand camp mode, neutral, and sentry mode are all ways to keep the 12v cigarette lighters hot. Sentry mode seems like the most viable solution because it’s a passive setting that’ll keep your 12v pumping — but I feel like it just uses far too much power. 1 mile an hour is like 280 or 300 watts an hour.

I’m curious if apps like TesLab or Nikola, where these apps do frequent calls to the car — if these apps would keep the car from sleeping and therefore keep the 12v sockets hot.

Anyone with those apps have any experience with cigarette lighter accessories staying on without sentry mode?
 

jcanoe

Active Member
Oct 2, 2020
3,469
3,518
Maryland
Aside from using ~250W when awake, i.e. when Sentry mode is active, the Tesla Model Y vehicle battery management needs to periodically enter Sleep mode and measure the open cell voltage of each cell within the battery pack. This can take several hours. During this time the Tesla vehicle needs to disconnect the high voltage battery from the rest of the Tesla vehicle's systems.
 
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limmerguy

Member
Nov 21, 2018
24
33
Bay Area, CA
From what i understand, constantly pinging the car and not letting it “sleep” still drains the HV battery pretty much at the same rate as sentry mode. Sentry Mode doesn't add significant power draw on top of the coolant pumps, fans, and HV contactors.

that being said, if you roughly know the duty cycle that keeps your fridge acceptably cool (or, just guess), you could ping the car, say, every 30 minutes and allow the 12v power to energize the fridge for a few minutes at a time.
 
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jcanoe

Active Member
Oct 2, 2020
3,469
3,518
Maryland
Other than for camping, tailgating etc. I don't believe having an electric cooler running all of the time in the Tesla Model Y would be a good idea. If you place the cooler in the sub trunk compartment there won't be adequate air flow. Drawing ~250W just to use a 30W cooler is not efficient. If there is condensation from the cooler's evaporator there is no condensate drain as with the Tesla HVAC system.

If you are storing bottles of water, etc. then there should be no issue running the 12V cooler during the day and then having it shut off each evening.
 
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DanDi58

Active Member
Jun 22, 2020
1,239
931
Dayton NJ
I use Tezlab and don't believe it randomly pings the car to collect data. When I open the app, it indicates that Val is sleeping and to tap again to wake up. I only get data when charging is complete (and the car would still be awake). There may be settings that allow for data to be gathered while the car is asleep (necessitating waking it up) but haven't enabled those.
 
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GtiMart

Active Member
Nov 13, 2019
1,388
1,222
Quebec City, Canada
Well-behaved applications like TeslaFi, Tezlab etc are coded so they don't keep the car awake. They have pauses in their polling to let the car fall asleep. I don't think they have tools to keep the car awake. Sentry can do that for you anyway, if that's what you want.
 
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Zachb1

Member
Jul 20, 2021
10
0
Los Angeles
I tried it out, running TezLab, sentry off. As you’d expect, sockets all turned off. Bummer! Wish I could just keep the 12v hot. The power usage is pretty low too.
 
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DanDi58

Active Member
Jun 22, 2020
1,239
931
Dayton NJ
I guess I'm confused - are you trying to keep this fridge running all the time, regardless of the status of the car, even while parked at home? Or just wanting to keep it on while camping or something?
 
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