SWR2500U Some derating likely [RE-wrenches]

[jberdner at sma-america.com]

Bill / Joel:

Yes, I agree that 22 140's is slightly above the upper limit of what we
recommend and we would be more comfortable recommending 20 SP 140's.
Remember though, Joel qualified the installation location by saying on
the North side, e.g. no direct sunlight on the inverter, and with good
ventilation.  In that case I think you can bend the rules a little
without too much negative impact on system performance, i.e. excessive
derating.  

With adequate airflow it is hard to get the heat sink hot under any
reasonable ambient conditions.  At the high ambient temps the array
output is so far down it is usually not an issue.  Normally derating
rears it's ugly head in the Spring and Fall when you have good sun
angles and irradiance but lower ambient temperatures so array output is
higher.  I try to think about these things from a kWh/year perspective
when I make judgment calls like this.  Worst case - I am wrong and we
will put a fan on it.

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: Bill Brooks [mailto:billb at endecon.com] 
Sent: Wednesday, November 20, 2002 5:26 PM
To: RE-wrenches at topica.com
Subject: RE: SWR2500U Some derating likely [RE-wrenches]

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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