Eric,
The inverter output should connect to the grid, either at the meter or
main panel, as if the generator isn't there. The critical (backed up)
loads should be moved to a separate panel. Install feeders between the
two panels, with a transfer (either/or) switch somewhere in the line.
The transfer switch may be either manual or automatic. The grid feeds
the main input of the transfer switch, the generator feeds the
secondary output, and the critical loads panel is the common output.
Be careful here - as Nick writes, things could get messed up quickly if
you don't get it right. And don't rely on signage or the customer
knowing what to do. Make it impossible to connect the two to each other.
Nick Soleil wrote:
Hi
Eric:
Did you notice my e-mail on this subject last week? I was hoping
that someone would have some new, more concrete information on this
subject, but I guess the old story still applies. Here is the basic
run down.
The inverters will likely see the generator as utility power,
especially if it is a decent quality generator, with a clean wave
form. The inverters will connect to the generator and back-feed the
power into the generator's alternator, causing heat and generator
failure. The solar will burn up the alternator. I have heard that
this has occurred before.
The only way to prevent this is to connect the solar directly to
the utility power (not through the generator's backed-up emergency load
center.)
If you must connect the solar through the generator's emergency
load center, then the generator must not be placed into "Auto," but
must instead be in "manual." The customer must be clear that the solar
breakers must be turned off before the generator is turned on. This
probably should include signage which makes this clear to the customer.
Nick Soleil
Project Manager
Advanced Alternative Energy Solutions, LLC
PO Box 657
Petaluma, CA 94953
Cell: 707-321-2937
Office: 707-789-9537
Fax: 707-769-9037
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