I'm annoyed that I can't use my 1-year old SolarEdge inverter without a grid connection, but need to live with it! I've purchased a GroWatt inverter to use when the grid goes down. If you have some time, please comment on the system that I plan on adding to my current on-grid system. I'm using a DPDT switch to switch between the SolarEdge inverter and the Growatt inverter. Any suggestions or ideas are great appreciated! If this works, I'll post the final design. Thank-you. See attached diagrams.