ST poor-formance [RE-wrenches]

[Joel Davidson]

William, please describe the system.
Number of PV modules?
Series string wire size and length?
Array rack type, tilt, and azimuth?

William Miller wrote:

> Friends:
>
> A few weeks ago I posted a question about apparent poor performance of
> ST2500 inverters as witnessed by myself.  Trace offered a replacement chip.
>  I received the chips and have upgraded 1 of the 3 inverters.  There was no
> improvement seen.
>
> These inverters are all running at about 60% of nominal rating.  The panels
> are new, clean and oriented directly towards the sun, within 5 degrees,
> during our tests.  The ambient temperatures have been in the 70 to 80
> degree F range.
>
> Calculations suggest that we should see in the neighborhood of 80% efficiency.
>
> The dealer who sold these inverters has contacted Trace and we are waiting
> to hear from them what explanation they can offer for this reduced output.
> In the meantime, we are checking our work and readings.  We will keep you
> posted.  If anyone else has any new experience with the ST inverters, I
> would love to hear about it.
>
> William Miller
>
> __________________________________________________________________
> William Miller
> SLO Communications: Communications and Power Systems Consulting
> PO Box 50, Santa Margarita, CA 93453
> Voice :805-438-5600             Fax: 805-438-4607       VMail: 805-546-4875
> email: wrmiller at slonet.org
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