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Originally Posted by Erasmo
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.
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Shouldn't the governor on the generator simply limit the speed to 3600 rpm or 1800 rpm - whatever synchronous speed should be? It will be spinning with minimal load?
The solar .. I think .. should limit it's output voltage to 125V L-N or 250V L1-L2.
If you hit your micro-grid with a step change - like turning on the toaster when nothing else was running .. the voltage will drop until the solar or the generator ramp up and then there will be overvoltage when the toaster turns off. The voltage may rise too high and kill something then, I guess.
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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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I always use the grid.
But just because the average power interruption per year is 20 minutes per year per household does not mean you many not experience .. like I have .. 8 continuous hours of no power while your basement fills with groundwater from the torrential downpour that tripped the power line to begin with.
There are always worst case scenarios.