system output honesty [RE-wrenches]

[David Blittersdorf]

I have a UPV 5548 grid-tie only Trace inverter (ETL-listed) built in 1999. Does 
this same problem occur with this inverter? I have noticed that above about 
1.5kw AC out that the fans do run all the time. Problem with this inverter is 
that it shuts down every night so any none firmware settings reset.

David Blittersdorf

On 4 Sep 01, at 9:00, Bill Brooks wrote:
> Todd and all wrenches with ETL-listed, grid-connected SW-series inverters,
> 
> I thought you'd never ask. Actually, this is fairly straight-forward as long as
> you don't screw around with any other settings. Don't call Trace if you screw
> everything up in the tech menus--just kill the voltage and start over.
> 
> The tech menu is the third level (go to menu 20, then push the red and green
> buttons). Go to menu 22 (Sync) and then push the down menu arrow until you get
> to "Set PWM Angle". The factory default is 129---push the down arrow until it
> reads 126 (minimum setting). Then make sure you return the unit to meters (or
> wherever you leave it) so that the owner doesn't screw up the settings.
> 
> I make no guarantees on whether or not the unit will blow up in your face
> (just kidding), but if you try this out on a good size array (3-5 kWstc)
> during the middle of the day, you will see a very pronounced reduction in
> heat of the SW unit.
> 
> The first time I did this on my unit, the inverter was producing 2000 Watts AC
> but was sloshing around 3000 Volt-amps AC. The fans were running full blast, the
> unit was burning hot to the touch which caused me to inquire what the problem
> was. After finally getting hold of the SW designer and describing what I was
> seeing on the oscilloscope, he suggested the above fix. After doing this, the
> volt-amps dropped dramatically and the unit cooled down and the fans started
> cycling. It would be a miracle for the efficiency of the unit to be above 80%
> under the unadjusted condition.
> 
> This ONLY applies to SELL mode operations. Off-grid units will not
> experience this problem because they are not syncing to the grid.
> 
> Bill.
> 
> 
> > -----Original Message-----
> > From: Todd Cory, Bald Mtn. Solar [mailto:toddcory at jps.net]
> > Sent: Tuesday, September 04, 2001 8:38 AM
> > To: RE-wrenches at topica.com
> > Subject: Re: system output honesty [RE-wrenches]
> >
> >
> > Ok Bill, spill the beans and tell us all what adjustments to make
> > in the tech
> > menu.
> >
> > Todd
> >
> > Bill Brooks wrote:
> >
> > > This mis-timing was causing substantial
> > > effeciency reduction. Once the error was corrected, the unit cooled down
> > > substantially and I was able to see efficiencies in the mid-to-upper 80s
> > > using very accurate equipment. All ETL-listed SW series
> > inverters have this
> > > problem and it can only be corrected by going into the tech
> > menu and making
> > > the adjustment.
> > >
> > > The new UL-listed units were supposed to solve this problem,
> > but I haven't
> > > had the time to do the detailed testing to prove it.
> > >
> > > Bill.
> > >
> >
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> 


David Blittersdorf
NRG Systems, Inc.
110 Commerce Street
Hinesburg, VT 05461 USA
Tel: 802-482-2255
Fax: 802-482-2272
email: davidb at nrgsystems.com
Web:http://www.nrgsystems.com

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