We already have grid-tied solar for the house -- a 5kW system installed by Sunrun. This project is nothing but a small-scale effort to basically build my own solar generator for emergency use - SHTF stuff. It's nothing exotic -- but I'm trying to do this right from the start. If the power goes out, the panels on our roof are useless because they're dedicated to grid-tie and the system shuts completely down by design in the event of a power outage. It sure would be nice if the solar companies offered a connection off of the grid-tie inverter that I could tap into and use to charge up batteries if the power was out -- I could do a helluva lot with 4 - 5kW of solar power.Just make sure the panels fit your application legality wise. Sounds like you are off grid hobby, so it doesn't matter, but the dirt cheap panels have the labels stripped so they are not UL so you can't tie them into the grid.