Inverter to Panel Wiring

I put in a sub panel, and moved the loads I don't want powered to it. I relocated the main incoming power to the sub panel, and put in a breaker off it to power the main panel. My inverter/charger has a built in transfer switch, so it just went between both panels. If yours doesn't, put a transfer switch between the panels, and attach the inverter to it. I have the electric water heater, aux charger, and ac's of the sub panel. Everything else has power 100% of the time. Either generator, or shore power will start the AC's, and recharge the batteries. There are times (at the in laws) that I have a 15 amp plug, a long distance away, the voltage drop was excessive. By tripping the breaker of the sub panel powering the main panel, and leaving the ac's & electric water heater off, I can use the small aux charger to keep the batteries up, and the inverter runs all loads off them. I can use the microwave, toaster, and coffee pot at the same time off the inverter without tripping the 15 amp at the house. Over the next few minutes the aux charger puts back into the batteries what the inverter took out.