SWR2500U Some derating likely [RE-wrenches]

[Joel Davidson]

How much is the derating?

Graham Owen wrote:

> Bill,
>
> I hope Shell read your posting.  The new earthsafe systems spec 22
> SP140’s.  I would probably continue panelizing groups of 4 in shop if
> they specified 20 modules (sometimes groups of 5 depending on the roof
> dimensions).
>
> I flew up to Sacramento recently and spent a long weekend with Matt
> Lafferty looking at many different installations and performance data.
> SMUD uses 20 KC120’s to avoid derating the SB inverter.  They also
> panelize in shop in groups of four with Tray cable.
>
> Graham
>
> Bill Brooks wrote:
> > John and Joel,
> >
> > Don't forget that the SP140 is the same module as the SP150 last month.
> > They
> > just rerated their modules. I think 22 SP140s is pushing your luck on
> > the
> > derating issue. I would feel better about 20 SP140s.
> >
> > Bill.
> >
> >
> > -----Original Message-----
> > From: jberdner at sma-america.com [mailto:jberdner at sma-america.com]
> > Sent: Wednesday, November 20, 2002 3:36 PM
> > To: RE-wrenches at topica.com
> > Subject: RE: SWR2500U Some derating likely [RE-wrenches]
> >
> >
> > Joel:
> >
> > I would expect very little to no actual power loss given this scenario.
> >
> > If you have any questions, or if I can be of any further assistance,
> > please do not hesitate to contact me.
> >
> > Best Regards,
> >
> > John Berdner
> >
> > SMA America, Inc.
> > 12438 Loma Rica Drive, Unit C
> > Grass Valley, CA  95945
> > 530.273.4595 (voice)
> > 530.274.7271 (fax)
> >
> >
> > -----Original Message-----
> > From: Joel Davidson [mailto:joeldavidson at earthlink.net]
> > Sent: Wednesday, November 20, 2002 3:34 PM
> > To: RE-wrenches at topica.com
> > Subject: SWR2500U Some derating likely [RE-wrenches]
> >
> > How much derating is likely with an SWR2500U inverter mounted on an
> > outside north wall in the shade with good ventilation with either 24
> > each KC120-1 solar modules or with 22 each SP140 solar modules and a
> > temperature range of 5  to 122 degrees F.?
> > Joel Davidson
> > (Michael, Thank you very much for moderating this list which is like
> > herding cats).
> >
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