Fixed vs. Tracking for Pumping [RE-wrenches]

[Roy Butler, Four Winds RE]

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OK...since everyone else chimed in, here's my $.02 worth!

We have several Zomeworks trackers and 6 or 7 of the Unirac trackers in 
operation right now and without exception have found that the Zomeworks 
units are NOT appropriate for moderate to high wind areas. We installed 
the high wind kits on the larger racks (UTR F-120 with 8 BP3150 modules) 
and it made no difference, they still flopped around in winds of 10+ 
mph. We wound up having to tie them down for the winter which definitely 
defeats their purpose!

We now oversize the array on fixed pole top or ground mounts....I sleep 
a WHOLE lot better on windy nights, as do my customers!

FYI....I always had the mismatched and/ or missing hardware problem with 
both the Zomeworks and Unirac units. Our oldest Z-works unit is now 7 
years old and has been painted 3 times, had 2 bearing replacements and 1 
shock absorber replacement. The frames may last 10 years but nothing 
else does!

-- 
Roy Butler
NABCEP Certified Solar PV Installer™
Four Winds Renewable Energy, LLC
8902 Route 46
Arkport, NY 14807
607-324-9747
www.four-winds-energy.com
NYSERDA eligible PV installer for PON 716
NYSERDA eligible wind installer for PON 792

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