Grid Tie 240 VAC w/ transfer switch? [RE-wrenches]

[Chris Daum]

Dear Wrenches:

My client's system is in California; he has two Bergey XL 1's on order, and 
has two Trace SW4024's and six 120W modules.  He is in a place with rolling 
power outages and wants back-up (vis a vis eight of the Surrette S460 
batteries).  His power is rarely out for more than an hour at a time.  His 
site offers excellent sun and winds, with 15 to 18 mph averages.

But, he doesn't want a separate sub-panel for his important loads.  Has 
anyone done a grid-tie with a transfer switch (located before the main 
electrical service panel), where one side of the transfer switch is from 
utility power, and the other leg is 240VAC from the inverter's output?  My 
client wants total back up not just dedicated loads, and says he'll "power 
down" in the event of a power failure (and yes, I've cautioned him that if 
the grid fails, it would be easy to max out his inverters). There is no 
fuel generator integrated into this system.

I've talked with a nice fellow from Asco (http://www.asco.com) about 
whether their transfer switches would work for this application.  We both 
think it would--but know of no one who's tested or tried this.

One thing I'm uncertain about, code-wise, is feeding the utility input into 
the AC 1 "in", from the utility side of the transfer switch (like, with a 
separate 60A circuit breaker).

Anybody got any ideas or experience with this type of system?  I'd 
appreciate any advice you could offer.

Chris Daum
Oasis Montana Inc.
406-777-4321 or 4309
406-777-2632  fax
http://www.oasismontana.com

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