Check under Settings to see if Auto Defog is set to On. Auto Defog can cause the AC and/or electric heat to come on to clear the windshield.When I turn off the max and eco setting and it displays fan-only, I still see over 3kwh consumption while parked. Both rear or front defrost are also off. When I turn the hvac off, consumption is 0 - .5kwh. I was expecting fan-only to use much less power.
Quite a bit of power for a 12V system, i.e. 13V x 20 amp = ~250W, not a lot of power for the Volt's high voltage system. 250W of power use doesn't even register on the Driver Information Console.Rear window defogger draws quite a bit of power. Certain that it's off? My Gen 1 will apparently turn the rear defroster on during precondition if it's cold enough outside.
Just to clarify, the rear window defroster is powered by the Volt's 12V system but the 12V battery is not supplying the power. The Volt's accessory power system (APS) is a DC-to-DC converter that draws up to 1800W @ ~13V from the high voltage battery. The 12V battery only supplies power during start up of the Volt's systems.OK, I did some testing tonight. I think this confirms it is the auto defrost setting: (ambient 40F)
setting on and plugged in set to fan only - draws +3KW
setting off and plugged in set to fan only - draws -3 KW (the 240v 16a charge rate)
The DIC displaying fan-only is misleading, it should display "fan-only auto defrost on". All this time I was lead to believe no significant power was being used when fan-only was displayed.
Also, checked the rear defrost, when turned on there is no change on the DIC , so I assume its using the 12V battery.
Thanks for the help!