SW-series inverters hazard? [RE-wrenches]

Bob Ellison, Alternative Energy Systems ellison at gisco.net
Tue Nov 20 19:11:30 PST 2001


When was the last time we saw the loads balanced on the grid or anywhere
else?
Makes me wonder how hard they had to work to make this happen.

Bob

-----Original Message-----
From: Bob Maynard, Energy Outfitters [mailto:bob at energyoutfitters.com]
Sent: Tuesday, November 20, 2001 7:03 PM
To: RE-wrenches at topica.com
Subject: Re: SW-series inverters hazard? [RE-wrenches]


Hi Joel and all,
We can expect a response from Xantrex on their website tomorrow.  Hopefully
this unfortunate situation can be rectified quickly.
Regards,
Bob Maynard

Joel Davidson wrote:

> Did you all see the UL notice about SW-series inverters?
> Does Xantrex have a solution to this problem?
>
> http://www.ul.com/about/newsrel/alert111601.html
>
> ALERT: PHOTOVOLTAIC INVERTERS MAY POSE HAZARD
>
> November 16, 2001 -- Underwriters Laboratories Inc. (UL) is notifying
> electric utility companies, installers and authorities having
> jurisdiction (AHJs) that Xantrex Technology or Trace Engineering
> photovoltaic inverter models SW3512, SW4024, SW4048 and SW5548 may: 1)
> support an unintentional island in the presence of a balanced load, when
> utility power is interrupted; and, 2) exceed the output current total
> harmonic distortion limit.
>
> Results of operational tests recently conducted by UL during field
> investigations revealed that SW series inverters may not cease to export
> power to the utility grid when power from the grid is interrupted in the
> presence of a balanced load. The SW series inverters may continuously
> sustain an unintentional island condition under multiple balanced test
> load conditions while exporting power at the tested 25%, 50% and 100%
> power levels.
>

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