Something I read on other forums:
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I believe the grid-tie inverters, as part of their "5 minute stable grid test" (before beginning to invert) also "pulse" the grid to measure it's impedance. A small "micro grid" will fail this test. As it ramps up it's output, the "micro grid" will quickly overvoltage (that's how GT inverters work, they produce a higher voltage to feed the lower voltage grid) reset, and then restart the 5 minute stability test.
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