Is this possible?

In a nutshell no. Discharging a car battery and recharging it will ruin it. Chrging it in an enclosed area is dangerous, batteries put out a "smell" while charging.

Disconnecting the battery is not a horrible idea though as there is a large "parasitic" draw on batteries that are in vehicles.

 

In theory this will work. Don't know if you can just go out and buy the adapter /charger plug you refer to. In practice, not that great an idea. Starting batteries are designed to send a huge rush of current and then immediately get topped back off. Using it in the way you describe will likely shorten its life. The plates inside starting batteries are sort of a mesh or screen type material, and continued deep discharge will start to dissolve the mesh. To make matters more complicated, tucking a deep cycle battery in under your bunk wont work very well either. They have a specific recharge routine taht your alternator does not follow, which will greatly shorten its life as well. Your best option is to get a smaller cigar plug inverter or hard wire your 500W direct to the batteries on the truck. This requires pretty heavy wires AND AN INLINE FUSE!

 

How do you propose the area be ventilated?

 

why not buy an inverter that plugs into the cigarette lighter and avoid the chance of ruining the battery and the expense of buying a charger.

 

I don't discount the importance of ventilation and it is good that you pointed that out. However, when the vehicle is moving (and charging) there is continual air exchange into/out of the cabin area on all vehicles that I am aware of. VW used to install batteries in the passenger compartment. I believe the Smart car still does. At any rate, the general message that I failed to convey is that it is that while it "could" be done, it is much more complicated than it sounds and I don't recommend it.

 

Lordy, if you have one wired in, hopefully by your shop, buy another 1500w inverter and have your shop switch them.

Mark