(UK requirements.)

Maximum export per phase 16A, so most domestic properties are limited to 3.68kW@230V. My inverter will accept up to 24A@230V but is export capped at 16A. I could add another phase or two but that would need a second inverter per phase. Expensive, unless you are a commercial operation.

If a generator is fitted, the premises must have a break before make grid/generator supply changeover switch, manual or automatic to prevent backfeed to the grid, no suicide leads!

My inverter works only grid tied, I will need a different inverter to go off grid, expensive luxury and no feed-in tariff.