multiple grid-tie inverter problem [RE-wrenches]

[Blair May]

1st) Check all wires, yeah I know you already did, but just take the
cover and check, pull on them &  make sure that the wires are in fact in
the wire blocks, not behind them.
2nd) Have you swapped the dc inputs to verify that it is not a bad
inverter?
3rd) Have you tried to power the "bad" inverter in the main dist panel?

-----Original Message-----
From: Jeff Yago [mailto:jryago at netscape.com] 
Sent: Monday, June 09, 2008 6:57 PM
To: RE-wrenches at topica.com
Subject: RE: multiple grid-tie inverter problem [RE-wrenches]



We have installed many systems, but a recent new grid-tie having
multiple inverters is giving us major headaches.  Two identical
side-by-side systems on same roof, each array supplies its own Fronius
inverter separately.  Each AC output feeds its own circuit breaker in
new sub-panel serving only these inverters, which feeds back to main
panel and meter base.  

One inverter never connects to grid, and error messages appear like
there is a problem with grid.  However, other inverter has no problem
and is on exact same breaker panels and wire runs.  Have tried to shut
down "good" system and start problem inverter first, but same problem.
Any way to widen or adjust inverter settings to make less sensitive or
to better match?  All Fronius inverter has is an error message display,
but no program setpoints that I can access.

I have seen problems in past when AC wire run is too long and the
voltage drop causes inverter to not connect due to low voltage, but if
that was case here, why would other inverters work just fine which are
on same AC wiring?

Thanks,

Jeff Yago

_____________________________________________________________
Netscape.  Just the Net You Need.


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