system output honesty [RE-wrenches]

[Bill Brooks]

David,

The UPV does not seem to have the same problem--It has it's own set of
problems like not being about to max power track. You are correct that any
changes you make would be lost anyway.

Bill.


> -----Original Message-----
> From: David Blittersdorf [mailto:davidb at nrgsystems.com]
> Sent: Tuesday, September 04, 2001 12:58 PM
> To: RE-wrenches at topica.com
> Subject: RE: system output honesty [RE-wrenches]
>
>
> 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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