multiple grid-tie inverter problem [RE-wrenches]

[daryl_solar at yahoo.com]

HI Jeff
I had this happen, and I had mis wired one to 120 instead of 240, sounds stupid, but double check.  
Darryl


--- On Mon, 6/9/08, Blair May <tump at hughes.net> wrote:

> From: Blair May <tump at hughes.net>
> Subject: RE: multiple grid-tie inverter problem [RE-wrenches]
> To: RE-wrenches at topica.com
> Date: Monday, June 9, 2008, 6:53 PM
> 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
> 
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