Various electronics

I've always been pretty dumb when it comes to electricity, but I have learned so much during the process of setting up the xB that I am no longer as dumb as I think I am (and certainly not as dumb as I look).  I figured out how to install a Voltage Sensitive Relay (VSR) that automatically keeps the two batteries separated when the car isn't running.  I also installed a 50 amp ammeter between the two batteries so that I could monitor the charging of the auxiliary battery while driving.  There is a kill switch in that circuit that allows me to turn off charging when the main car battery is run down (so the alternator isn't overly taxed).  There is also a selection switch for the fridge so that you can run it off of either battery or both batteries.  This allows you to charge the auxiliary battery completely while running the fridge off the alternator.  Then there is the sine wave inverter that gives us 120 volt power for the sleeping bag heaters and for Strikers cat condo.  Add to all of that a bunch of 12 volt outlets; two charging centers for everything from cell phones, to camera batteries, flashlight batteries, and specialty batteries for Carol's heated gloves and vest; voltage monitors for both batteries; etc; and you would actually start to think I might know what I am doing.