Hi Folks,
We burnt up a gen set's voltage regulator on an off-grid system sunny
island/sunny boy system when we took the sunny island's off-line but
didn't shut off the sunny boy. So the SB backfed the genny and fried
the very expensive voltage regulator on a 30 KW system. SMA had us
install a relay to tell the SB to shut down as soon as the AC
reference from the SI was gone. Same situation as grid-tie really in
terms of your question.
Jeff
Hi Kelly
It is an interesting issue and was just dicussing this the other day.
I think what happens if the inverter backfeeds the genny, the
generator voltage will go up, if it goes up enough, it will go
outside the window of the inverter and the inverter will drop out,
voltage will them return to normal, inverter will reconnect and
repeat.
But I sure wouldn't want to fix the generator. A relay powered from
the grid will take care of the problem.
jay
peltz power
On Nov 19, 2008, at 5:24 PM, Kelly Keilwitz, Whidbey Sun & Wind wrote:
Wrenches,
I'm dredging up this subject again (previous postings 6/08) with a
simple question that doesn't seem to have been answered:
Is there any issue connecting a batteryless grid-tie PV system to
the load side of a panel that is backed-up by a generator on an
automatic transfer switch, when the grid is down and the generator
running?
In this case the PV is 5.7kW, the inverter an SMA 6000, the
generator unknown size/type, but propane, automatic start, and
backing up the entire main panel.
SMA tech support first said it's OK, then that the generator will
blow up. I can imagine, if the inverter tries to sync with the
inverter, that the voltage could rise, causing the inverter to
disconnect, wait 5 minutes, repeat. Is there anything nasty that
could happen?
Thanks,
-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd,
Coupeville, WA 98239
PH & FAX 360-678-7131
<>[EMAIL PROTECTED]
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Turnkey Solar Design & Installation for the Commercial Sector
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