Is the AC outlet in the back powered by the traction battery or the 12V?

[fubar.droid]

Does anyone know? I'm guessing the 12V but would the main battery keep it charged if you draw from it for an extended time?

Sponsored

 

[daveo4EV]

all systems in modern vehicle's are powered by 12V power - in this case the 12V power will be "back fed" by the big battery when the 12V battery needs to be rechargred

i understand your questions, but honestly what difference does it make?

 

[fubar.droid]

Well based on other threads, it seems like the traction battery only charges the 12V when it's plugged in or the car is running, it does make a difference.

 

[daveo4EV]

the car has to be "on" for the 12v to have any power - and if hte car is "on"" the big battery is "feeding" the 12V battery

 

[themacnut]

the car has to be "on" for the 12v to have any power - and if hte car is "on"" the big battery is "feeding" the 12V battery

And Dave wasn’t it advised if you leave the Macan parked for an extended period of time (like vacation) to leave the charge plug plugged in and it will keep the 12V battery charged?

 

[daveo4EV]

And Dave wasn’t it advised if you leave the Macan parked for an extended period of time (like vacation) to leave the charge plug plugged in and it will keep the 12V battery charged?

yes that's Porsche's recommendation. the 12V batteries on most EV's don't have very much capacity - they are really needed to be that big - they just have to wake up the computer to allow the big battery to be powered - once the big battery is online there is plenty of power for 12V juice

 

[themacnut]

The 12V battery lesson I experienced I had two extended shop visits (stereo and PPF). First drive after I had a few weird errors that cleared themselves after a long drive and next drive. We went on vacation in February for a 7 days, left it plugged in at home. No errors this time.

 

[Great_Cookie]

My question would then be - would a remote preconditioning be enough to trigger the same behaviour (ie charge the 12V battery)? Am assuming that HVAC is run off the HV battery, right?

the car has to be "on" for the 12v to have any power - and if hte car is "on"" the big battery is "feeding" the 12V battery

 

[daveo4EV]

HVAC should wake up the big battery - there is not enough capacity in the 12V battery to run HVAC for any length of time…

the 12V battery in these vehicle's is very very small capacity - and you can precondition for up to an hour…

I'm 100% sure the goal is the the big battery keeps the 12V topped off - _IF_ the 12V battery dies doing something "normal" it would be a bug in the system not a design goal - I'm not saying Porsche is bug free - but it's also not flawless

there is no way the 12V battery has the capacity to run HVAC for any length of time that is meaningful…

unless it's absolutely trivial power wise - the even money bet is anything do with 12V power the big battery is involved…

 

[Great_Cookie]

I’m actually thinking from the angle of a Dashcam (original or otherwise) that is usually tapped into that (12V battery), in parking mode, will drain the 12V to the point it cuts out in a ‘low voltage’ state.

Would triggering a pre-conditioning (waking the vehicle to run cooling off the Hv battery) be able to recharge the 12V battery to a sufficient state to let’s say wake the Dashcam again?

 

[W1NGE]

My question would then be - would a remote preconditioning be enough to trigger the same behaviour (ie charge the 12V battery)? Am assuming that HVAC is run off the HV battery, right?

HVAC is 800v and therefore powered by the big battery.

 

[rcomeau]

I’m actually thinking from the angle of a Dashcam (original or otherwise) that is usually tapped into that (12V battery), in parking mode, will drain the 12V to the point it cuts out in a ‘low voltage’ state.

Would triggering a pre-conditioning (waking the vehicle to run cooling off the Hv battery) be able to recharge the 12V battery to a sufficient state to let’s say wake the Dashcam again?

Would the dash cam not be powered by a circuit that would get cut when the car goes onto a deeper sleep? I have not idea, but that would seem logical. In any case, the HV pack should be keeping the 12V healthy in all typical scenarios (I'm sure the engineers sat for a minute to think this through) barring an unforeseen edge case, software glitch and/or failure in the battery management hardware (my Jaguar I-Pace EV has had the last 2 of these issues more than once).

 

[W1NGE]

Would the dash cam not be powered by a circuit that would get cut when the car goes onto a deeper sleep? I have not idea, but that would seem logical. In any case, the HV pack should be keeping the 12V healthy in all typical scenarios (I'm sure the engineers sat for a minute to think this through) barring an unforeseen edge case, software glitch and/or failure in the battery management hardware (my Jaguar I-Pace EV has had the last 2 of these issues more than once).

HV doesn't function as you'd expect. Note the number of 'flat' 12v batteries across Taycan / Macan EV range.

 

[SteveInKirkland]

Is the AC outlet in the back powered by the traction battery or the 12V?

The AC outlet in the back of my 2024 Macan 4 EV only works when the HV battery system is powered on.

 

[PrudentOcean]

It works for 30 minutes after driving readiness is turned off.

Sponsored