garygid wrote:The seat, steering wheel, and cabin heating perhaps?
Gary, I must give you an F grade since you are an engineer. The consumption is never going to get even remotely that high on the 12V system. The heat will run off the pack and be the biggest load and pull about 16-20A, the power steering should be electric and on the 12V side pulling only a few amps from the pack side via the DC/DC and the seat will be about 5 amps max on the pack side, for power seats unless heated which would be silly. On my EV with every accessory on and the heater and including EPS I could not pull 12A off the pack side of a 240 pack, let alone a 300V plus pack. Even normal headlights would pull less than 1A off the pack. The way to load the 12V system is with aftermarket stereo amps.
The solar cell is almost pointless except for long term parking as it will trickle the 12V battery which controls the contactors for the main pack. If the 12V battery dies and you pack is charged you could be out of luck as the DC/DC is usually off when the key is off and the 12V is requires to activate the contactor to the DC/DC. If you leave a LED marker light on while parking for safety the solar panel would easily cover that.