I recently bought a used grooming van which has an Onan generator. My old van had an inverter system and I like that. I would like to do a hybrid system. My mechanic has limited experience with inverters. Does anyone know where I could get some info on how to set up the inverter so that the batteries get a charge when the generator is going. Does anyone have any diagrams or know of any websites that shows how that is done. Also, how many batteries should I need to run the smaller stuff? I think I want to use AGM batteries. Due you need a specific charger if you use AGM batteries? I used lead acid batteries last time. Thanks!