Hi William,
We've been running 2 different tracker-mounted 12 KW (DC) systems in
Corona, CA.
System #1: Horizontal-axis (N-S axis) installed Sept of '02. So we
have 6 years of data on that.
System #2: Dual-Axis Wattsun Trackers: Installed April of '04. So
4.5 years of data on that.
The NREL numbers predicted a 40% increase over fixed-at-latitude for
the dual axis and 29% for the horizontal axis.
Although I have not compiled the data for a while I do remember when
checking after a full 2 years on each that the numbers were very
close to matching those predictions. Only under by a few percent if
at all.
Both systems feed into a Sunny Boy Control Plus with a dedicated
modem so I can call up the system anytime and we have inverter by
inverter data for the whole 24 KW array. If you'd like that data I
can send it to you. Contact me offlist.
Best,
Jeff C.
Friends:
For years I have relied on some old studies to quantify the
effectiveness of one and two axis tracking. I have heard anecdotal
reports that tracking does not deliver the increase in power that
was originally reported, especially in winter. Are there any recent
studies on PV tracking that might quantify these values? I would
like to compare tracking in off-grid and grid-tie applications.
Thanks in advance.
William Miller
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~~~~~~~~~~~~~
Jeff Clearwater
Senior Design Engineer
NABCEP (tm) Certified Solar PV Installer
http://www.nabcep.org/
NorthEast Solar Design
Turnkey Solar Design & Installation for the Commercial Sector
http://www.villagepower.com
[EMAIL PROTECTED]
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65 Schoolhouse Rd
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