[aprssig] backup pwr systems - slightly off-topic

Derek Koonce derek at dkoonce.com
Mon Dec 11 00:36:19 CST 2006

I have looked at these systems. Most on-grid systems will shut down if 
they detect the power grid shutting down. They will not power the house 
in this state unless one has a battery back-up system. And then the 
system will disconnect the house from the grid to prevent "islanding".

Derek Koonce

Bruce Gordon wrote:

>What you describe is exactly a grid-tie inverter, just not so large as those
>used in all house or larger systems.  I have never seen how they protect
>themselves and others from the hazards of tying to the grid but I can't
>think of a reason that it couldn't be done in a smaller unit.  Might burn up
>a little of that "copious free time" however.
>Bruce Gordon

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