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A proper breaker box should have a main switch between the meter and your house.
I don't recommend using a generator to trick the inverters into thinking that the grid is up, if you do that you have both the generator and the pv pumping 5-6kW in a system where it can't flow back to the net, a recipe for disaster.
Just use the generator and run a few leads to keep the fridge cold and charge your phone. Or perhaps don't neglect your public infrastructure 30 years, grid cost here for an household is about €220 and the average downtime is 20 minutes a year.
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