I need to set up my solar system using the "SMA FLEXIBLE STORAGE SYSTEM with Battery-Backup Function" which is hybrid (but not adequately described for my version of the inverters).
My problem is that when on-grid it uses the grid neutral for the earth. When we disconnect, it disconnects both poles, so I need to use a local earth. The battery inverters will be chugging along anyway so I don't need a full "Automatic Transfer Switch", just something that detects a loss of power from the grid and automatically transfers the earth to local (and back again when it comes on). Any ideas?