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Discussion Starter #1
I often drive my spouse to appointments and wait in the I-Pace using the satellite radio and A/C. I don’t want to run the 12V battery down so I make sure the car is fully “On” and using the driving battery (I’m not worried about the loss of range on these errands near home).

Sometimes I am able to use a free Volta L2 charger while I am waiting in the car using the accessories. When charging it is not possible to turn the car fully “On”. From what I can tell it is in the “Accessory” mode using the 12V battery. Is the 12V battery being kept charged while I am using the accessories during charging? I’d hate to end up with a dead 12V because the accessories are being used without the main battery “On” during charging. Or is it?
 

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Discussion Starter #2
Nobody knows if the 12v battery is kept charged if accessories are used during main battery charging? I thought there'd at least be some uneducated guesses. :)
 

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It differs from car to car, most will recharge 12V battery from main traction battery when the car is “on” not on idle. But there is nothing that says it has to be that way. Don’t know for sure about I Pace.
 

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I've had the radio on and even activated the climate system while charging at a 50kW DC charger. The radio doesn't pull enough current to be noticed. The climate system causes the power draw from the charger to go up.

It isn't necessary to turn on the accessory mode to get the radio and top center display to come on. One just pushes the button in the round knob as if turning on/off the media while driving. It does periodically shut off and requires a re-push of the button in the knob. There's a 1 minute warning too before it shuts off. It turns back on quickly without the delay of an initial power up.

To what extent are you using "accessories"?
 

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The climate system runs from the main traction battery, the accessories (probably including all lighting, etc) run off the 12v battery. So the question is when the DC to DC converter is activated to charge the 12v batteries from the main traction batteries. If the 12v battery dies then the entire control system will no longer work.
 

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Discussion Starter #7 (Edited)
The climate system runs from the main traction battery, the accessories (probably including all lighting, etc) run off the 12v battery. So the question is when the DC to DC converter is activated to charge the 12v batteries from the main traction batteries. If the 12v battery dies then the entire control system will no longer work.
Are they smart enough to keep it charged during DC or L2 charging in this case? I wish there was a way to find out.

I’m running the accessories for over an hour which I would never do in an ICE without the engine running, but I did it in my former Tesla while charging and never had a problem.
 

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Discussion Starter #8
It isn't necessary to turn on the accessory mode to get the radio and top center display to come on. One just pushes the button in the round knob as if turning on/off the media while driving. It does periodically shut off and requires a re-push of the button in the knob. There's a 1 minute warning too before it shuts off. It turns back on quickly without the delay of an initial power up.
I definitely would not do that. That warning and automatic shutoff is because you are draining the 12v battery without the main battery keeping it charged in that state.
 

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I’m running the accessories for over an hour which I would never do in an ICE without the engine running, but I did it in my former Tesla while charging and never had a problem.
I never had an issue sitting in my car for over 5 hours plugged into a 3.6kw L2 with the outside temps in the teens last winter. I also would remotely start my climate multiple times throughout the winter, especially when the temps were below zero, because I really liked getting into a toasty warm car. Never had any battery issues
 

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I never had an issue sitting in my car for over 5 hours plugged into a 3.6kw L2 with the outside temps in the teens last winter. I also would remotely start my climate multiple times throughout the winter, especially when the temps were below zero, because I really liked getting into a toasty warm car. Never had any battery issues
Remote climate uses the main traction battery, I believe the concern is the 12v aux battery?
 

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I’m running the accessories for over an hour which I would never do in an ICE without the engine running.
As a teenager I would have the car in ‘accessory’ mode for hours while wrestling in the backseat out in the country...never had any problems with it. The amount of draw from the radio is minuscule
 

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Discussion Starter #14
As a teenager I would have the car in ‘accessory’ mode for hours while wrestling in the backseat out in the country...never had any problems with it. The amount of draw from the radio is minuscule
Ah, ok. Maybe it's not worrying about, then. I had a car a decade ago where the battery kept dying early and I kept getting new ones. I left extra time to get to work in case of traffic but usually I would arrive early before my shift started and I was in the habit of sitting in the car with the radio on (and the car off) for a half hour or so every day when I got there. My trusted service advisor told me this is probably what kept killing my battery. That is the source of my concern about using accessories while nothing is keeping the 12v charged. But it sounds like it's not going to be a problem, based on all the responses so far.
 

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As a teenager I would have the car in ‘accessory’ mode for hours while wrestling in the backseat out in the country...never had any problems with it. The amount of draw from the radio is minuscule
Ah, ok. Maybe it's not worrying about, then. I had a car a decade ago where the battery kept dying early and I kept getting new ones. I left extra time to get to work in case of traffic but usually I would arrive early before my shift started and I was in the habit of sitting in the car with the radio on (and the car off) for a half hour or so every day when I got there. My trusted service advisor told me this is probably what kept killing my battery. That is the source of my concern about using accessories while nothing is keeping the 12v charged. But it sounds like it's not going to be a problem, based on all the responses so far.
Yes, no way 30 minutes of listening to the radio killed your battery. I would guess you had a weak alternator
 

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I swear that they keep a 12v battery in electric cars just to make dealerships happy.
I think it’s a little bit of chicken and egg, you need active electronics to manage the main battery, and if anything glitches you don’t want the same power source for the control circuits! Also DC to DC converters are bad at providing small amounts of current for light draw (like when car is “off”).
 
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