Russell:

How did you get in?  The site is plastered with access warnings.  And the
file read comes up as "damaged" and will not open.

Please advise.

Thanks,

Rich

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Russell McMahon
Sent: Monday, October 26, 2009 9:54 AM
To: Microcontroller discussion list - Public.
Subject: [EE]:: Sandia - Photovoltaic panel optimisation report / PV array
performance model

Useful Sandia labs reports relating to PV panel performance:

             2003 Photovoltaic / PV / Solar panel optimisation report. 77
pages.
             2004 Photovoltaic array performance model. 43 pages

While these reports are now over 5 years old they will still be of
significant use to
people interested in real-world PV panel performance and in matching theory
to practice.

Russell McMahon


*"Firefly" optimisation*

http://prod.sandia.gov/techlib/access-control.cgi/2003/033493.pdf

The "Firefly" report provides an intensive look at what is involved in
evaluating real world PV systems. Sandia are highly professional and
thorough in
their work and reading something like this can be instructional even if the
actual subject is only of middling interest.  The report  also gives an
interesting look at how inefficiently a system may be operated in real world
conditions when it is highly obvious that changes are needed. In this case
it's clear that a very substantial mismatch occurs between the battery-load
and the panel's optimum peak power load with a consequent extremely
significant loss of acquired energy. While MPPT energy matching would be the
obvious choice, a simple change in PV cell quantity per panel would have
produced superior results.

*PV performance model.*

While there are numerous papers available which derive PV panel
characteristics from basic principles this paper is about as simple as could
reasonably be hoped for, matches theory and practice and covers translating
results to standard conditions so that meaningful comparisons can be made.
It has useful extra material, ancillary to the main subject such as the
reflectance losses with panel angle in figure 7. (Note that these losses are
additional to the obvious "cosine" losses which result when the panel is
tilted at an angle to the sun.

http://prod.sandia.gov/techlib/access-control.cgi/2004/043535.pdf

SANDIA REPORT
SAND2003-3493
Printed October 2003
Experimental Optimization of the FireFly 600V  Photovolta' Off-Grid System
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