Performance of Large Outback system [RE-wrenches]

[Carl Emerson, Free Power Ltd.]

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Doug,

My guess is module temp about 150 F.

Doug when I look carefully at the graphs from the BIPV evaluation project,
these modules are doing better than other technologies when module temp is
taken into account.

Here in NZ we have however made sure that the roof construction includes
adequate ventilation as this will improve the performance of any module.

Carl Emerson
Manager
Free Power Ltd.
Cell 021-633999 Cellfax 021-2919399 Email emerson at freepower.co.nz


-----Original Message-----
From: Doug Pratt [mailto:dmpratt at sbcglobal.net] 
Sent: Monday, 18 October 2004 9:32 a.m.
To: RE-wrenches at topica.com
Subject: RE: Performance of Large Outback system [RE-wrenches]

 

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Carl,

Midday ambient temperatures average 80-95 degrees F in my northern
California climate. Module temp? Honestly never measured it. Probably
reasonable to expect the modules to be 30-40 degrees warmer than the
ambient. 
Cheers,
Doug

-----Original Message-----
From: Carl Emerson, Free Power Ltd. [mailto:freepower at freepower.co.nz] 
Sent: Sunday, October 17, 2004 11:44 AM
To: RE-wrenches at topica.com
Subject: RE: Performance of Large Outback system [RE-wrenches]

Doug,

What module temperature were you seeing at the 2000 watt output ??

Carl Emerson
Manager
Free Power Ltd.
Cell 021-633999 Cellfax 021-2919399 Email emerson at freepower.co.nz


-----Original Message-----
From: Doug Pratt [mailto:dmpratt at sbcglobal.net] 
Sent: Monday, 18 October 2004 7:30 a.m.
To: RE-wrenches at topica.com
Subject: RE: Performance of Large Outback system [RE-wrenches]

Matt, I also have a large Uni-Solar peel 'n stick array. 48 116-watt
laminates with a factory rating of 5568 watts, facing due south. I've
been running it about two years, initially with an SW5548, now with a
pair of GVFX3648s (serial #s 1 and 2...thank you very much Robin and
Christopher!).

I'm not very impressed with these laminates either. These modules are a
lot more temperature sensitive than the factory admits. I'm reading
wattage off the pair of MX60s running the array, which ought to be about
the same as you're seeing from the Sunny Boy. Note that I'm NOT talking
about the wattage actually being delivered to the grid. Since I've got
batteries, there's some minor loss there.

Most of the time, each of my MX60s cruises along at something close to
2000 watts output thru midday. 4000w divided by 5568 rated w = 71.8%
Interestingly Matt's observed output of 3680w divided by 5120 rated w
also = 71.8%. Coincidence? Probably not. These modules consistently
under-perform in the real world (IMHO). Now, to be honest, I've also
seen my MX60s hit over 3,000 watts each for brief periods, about 10-12%
over specs. But that was a cool, cloudy day, and was probably an edge of
cloud effect. It didn't sustain more than a minute or so.

Cheers,
Doug Pratt 

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