emd001:
All of the scanners/strobes/misc accessories are run directly from the battery, through a ChargeGuard Select unit (
SIRENNET.COM - ChargeGuard Select Vehicle Power Management System). It ensures that the gear will never drain the vehicle's battery when the engine is off. There are five switches in the console area to control the various equipment. I didn't have a second battery installed in this vehicle because all of the equipment doesn't really use a ton of power. I'm able to run all of the radios for quite some time before running into power issues. The car's engine is running most of the time when I'm at work.
I have a Xantrex inverter installed in the cargo area -- will take photos soon.
Hope this gives you some ideas!