I have a grid tie solar power system how do i keep power when the grid goes down?
Now my panels connect to a grid tie invertor that makes 240 ac and feeds that back into the utility grid, but if the grid ever fails my system goes off line to protect islanding, I want to figure a way to still have power during the day (no batteries) so I was thinking if there was a way to shut off the main breaker to the outside world and install somehting to make the inverters think the grid was active so they would produce power.... I dont know like backfeed a very small generator and let the panels sync to that? I would prefer some form of puseodo sine wave generator thinggy to trick the inverter into producing power
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A grid-tied inverter is generally designed to anticipate this kind of trick. It will monitor the frequency of the line, and even its impedance.
If you have power that goes out often, what you need is probably just a small generator and a transfer switch.