I've used NREL's data (PVWatts) to compare trackers vs. fixed. Here
in Taos, its worth the money for the summer, but not cost effective
for the winter. I only recommend them now for water pumping (summer
max load) and grid tie.
I have no reason not to trust the NREL data. Its correlated with our
experience over the years nicely.
Ray
On Sep 3, 2008, at 6:42 PM, William Miller wrote:
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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