4024SW [RE-wrenches]

[info at backwoodssolar.com]

I recently drove out to the Olympic penninsula to resolve a customer
complaint about excessive radio noise from a SW4024. He had complained to me
and to the factory for a year, wanting one of us to come witness the
problem.  I went with a replacement inverter of identrical type and a
ProSine 3.0.  This customer was a ham radio operator with oscilloscope  on
site, so we looked at waveform and harmonics, inspected the grounding system
and wiring, and compared inverters for interference on various receivers.

The grounding was very well done, wiring was up to code, all components
close together.  The received interference was radiated mostly from home
wiring which was romex normal installation.  Metal conduit might have
restricted some of the radiated noise, but had not been used in this now
finished

Backwoods Solar Electric Systems www.backwoodssolar.com
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2 miles from utility lines,
powered entirely by our catalog products.
IF UTILITY POWER IS 1/4 MILE OR MORE FROM YOUR SITE,
get our free 160 page solar-electric Planning Guide/Catalog.
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Phone(208)263-4290  Fax (208) 265-4788  in Idaho, USA


----- Original Message -----
From: Tom Elliot <telliot at wagonmaker.com>
To: <RE-wrenches at topica.com>
Sent: Wednesday, May 30, 2001 9:50 PM
Subject: Re: 4024SW [RE-wrenches]


> I'm not surprised at the unclean results from the power companies meters.
I
> just ran my 4024 through an o'scope test and it came back with varying THD
> from 3% to almost 7% depending on the load.  What makes it noisy, as my
> friend wielding the meter informed me, is the harmonics on the Trace.
There
> are a lot of high frequency variations that you wouldn't ordinarily see on
> the grid and it is probably those that cause the noise problems.  He
checked
> his grid and found worse THD on the grid and much less stable voltage but
> also far less "noise" than on the Trace.
>
> Tom Elliot
>
> ----- Original Message -----
> From: "Daryl DeJoy" <penobscotsolar at panax.com>
> To: <RE-wrenches at topica.com>
> Sent: Wednesday, May 30, 2001 4:58 PM
> Subject: 4024SW [RE-wrenches]
>
>
> > Hi all,
> > I''ve heard an unsubstantiated rumor that the U.L. listing on the 4024SW
> > inverter might be pulled because of its relatively unclean power. Has
> > anyone else heard anything about this?
> > Both grid tie systems we have done so far (with 4024SW inverters)
required
> > the local power companies engineer to come out and put a scope on the
> > output. When he compared it to the grid it was much less clean. It
> > obviously met parameters in both cases, though, because they passed the
> > installation and installed the meter.
> > Anyway, thoughts?
> > Daryl
> > Penobscot Solar Design
> >
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