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I've been reading around a lot of threads here about preconditioning and haven't found an answer to this question:

How can I get my DW's Volt preconditioned as warm as possible in our attached/insulated-but-not-heated garage without reducing the range (discharging the battery during preconditioning)?

Things I have read about preconditioning that confound this objective:
1) You can only auto-start 2x (total of 20 minutes) without actually going into the car and starting it.
2) Running the heat manually (turning up the temperature to 85 degrees and maxing out the fan) will draw 5000W which by my calculations is about 3800 more than the max 120v charging plug can draw leading to discharge of the battery like driving at freeway speed during the preconditioning cycle.​

Does setting the temperature high (85 degrees) in Eco mode actually heat the car and does it do so at a rate that doesn't exceed the 1200W input from the 120v charger? If not, how much beyond the 1200W does it draw?

My garage is probably like that of many folks here. It is always warmer than outside. It can get pretty close to freezing on the coldest of nights, but never quite gets to freezing (it does house my gas-fueled water heater).

I guess you can set the car NOT to ERDTT while plugged in (would NOT be a good thing in an attached garage), but haven't found where you set that yet. If someone can give me the navigation instructions that would be appreciated.

My objective is to have her set her car at night (she always has it parked and plugged in long enough to fully charge) so she can run 2 preconditions cycles while getting ready in the morning, get into a reasonably warm car, turn on the bun-warmers and hand-warmers, keep the temperature set at 75 degrees on Eco and have a nice ride to work. Hopefully without discharging the battery during the preconditioning process...

My wife's daily driving routine (round-trip to work, let out dog, round trip to gym) pretty much uses 95% of the fully-charged battery currently (light AC duty for short periods). Winter will probably require small amounts of gas, but we can leave that for when she has the car parked outside in the cold. So coming home will probably involve using gasoline to pre-heat the car (it's probably worth a pint of gas to have a comfortable ride home anyway + I guess that warms up the battery to coax a little more mileage out of it?), but that will be the subject of another thread...
 

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My objective is to have her set her car at night (she always has it parked and plugged in long enough to fully charge) so she can run 2 preconditions cycles while getting ready in the morning, get into a reasonably warm car, turn on the bun-warmers and hand-warmers, keep the temperature set at 75 degrees on Eco and have a nice ride to work. Hopefully without discharging the battery during the preconditioning process...
Impossible on L1 charging.
The second you do a remote start, it jumps to comfort modes and uses as much power as it requires. It only resumes your 'eco' program when you get in and start the car to drive.
So you'll use say, 4000W average over 20 mins, but only replenish @ 1200W.

Get L2 charging and you should be reasonably good to get the cabin heated and battery close to full within the 20 mins.
I would never advise enabling ERDTT unattended in an attached garage. Always make sure that option is disabled while plugged in.

If you don't need the remote part of the start, actually going out to the car and starting it on eco ~30 mins before departure should warm it up and not deplete the battery much. (You can then lock it and go back inside to get ready or whatnot)
 

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Get L2 charging and you should be reasonably good to get the cabin heated and battery close to full within the 20 mins.
Bingo -- if the OP wants the wife to be happy, struggle with preconditioning on the Level 1 charger for a bit and then get a Level 2 and the OP will be the hero.
 

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There is a selection in the config menu to turn off engine running while plugged in. A must for garage pre-conditioning! Get a level 2 charger if you want to pre-condition. So much nicer for daily charging too. Level 1 sucks.
 
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