> Here's a web page describing such a system, with the addition of local
> storage batteries.
> http://www.ka9q.net/pv/
> I only scanned the page, but didn't see any mention of having to provide a
> 60 Hz reference when the grid was down. Maybe his inverter is different
> than Doug's.
Battery-backed systems use different equipment, and *do* stay on line
when the utility drops out.
You lose a few percent of efficiency with the battery-backed systems,
since the panels is essentially a big battery charger, the house feed
comes off the batts.
John.
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