Mounted the main bus to the left subpanel. The avionics bus in mounted next to the main bus. Since I am using a TCW battery backup system, I see no need to have an "essential" bus as the items that would be on it have a 2nd input power wire that will connect to the back up battery. The back up battery has 4 output wires and I will have one G3X screen, the GTN navigator, the autopilot head unit and transponder on the back up battery power. The engine monitoring unit is mounted behind the left subpanel.
