My generac whole home unit will throw a breaker/switch when it senses the power stays off for however many seconds and then start up the generator. What impressed me was the ability of the unit to prioritize the 220 so you can get by with a smaller power plant. The dryer is the lowest while the hvac is highest. Oven and water heater depends, if the oven is on but the water heater needs to come on it will wait until the oven is off. There’s no interruption when the power comes back and the gen runs 10 minutes to cool down before it shuts down. No backfeed possible, it’s either on gen or grid. I’m sure a similar set up could be made to keep any solar generated power from the grid when the grid dies.
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