ST poor-formance [RE-wrenches]

[Solar Technologies]

We have a couple of "repaired and upgraded" ST2500s put back into service a
couple of weeks ago.  The best performance we've seen from them at high noon
on a sunny day, about 75 degrees was 1740 watts from one and 1637 from the
other.  Each runs off of 24 AP110s. Bill Brooks has suggested these systems
ought to be thought of a working if they are about .7 of rated capacity, so
I guess 1740 is close.  The 1637 reading seems a bit low, however.

Anybody have any input from a Sunny Boy installation yet?  How does their
output compare to the ST series?  We'll have our first system up later in
the week.

Roger DeNault
Solar Technologies

----- Original Message -----
From: "William Miller" <wrmiller at slonet.org>
To: <RE-wrenches at topica.com>
Sent: Monday, July 23, 2001 11:14 PM
Subject: ST poor-formance [RE-wrenches]


> 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
> License No. C-10-773985
> _____________________________________________________________
> Compatibility:
> Word processor: WP7
> Spreadsheet: Quatro Pro 7
> CAD: Microstation 95, DXF, Visio 4.1T
> _____________________________________________________________
> "I stand by all the misstatements that I've made." Dan Quayle
> __________________________________________________________________
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
> List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
> Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
> Hosted by Home Power magazine
>
> Moderator: michael.welch at homepower.com
>
>
>

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

==^================================================================
EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9
Or send an email To: RE-wrenches-unsubscribe at topica.com
This email was sent to: michael.welch at homepower.com

T O P I C A -- Register now to manage your mail!
http://www.topica.com/partner/tag02/register
==^================================================================