Tracker efficiencies - generalized [RE-wrenches]

Windy Dankoff, Dankoff Solar windy at dankoffsolar.com
Thu Mar 21 17:02:58 PST 2002


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>.... Personally, I've about
>had it w/trackers. I'm willing to work on mine all of the time but my
>clients are at their wits end.
>
>Jeff Oldham


Jeff,

Are you including Zomeworks passive trackers in the above statement? 
That would be very surprising. They are extremely durable in my 
experience. You replace a shock absorber or two every 5 years or so. 
Leakage of the working fluid is pretty rare and can be fixed by 
replacing the cannister assembly.

UNIRack now has a passive tracker on the same principle.

To estimate the gain from passive tracking, you need to take the 
theoretical data you might get from NREL, and subtract a factor for 
less accuracy, less range of motion, morning wake-up delay, and 
occasional wind-shift. I would guess it's about 15% less gain.

We sell lots of passive trackers for water pumping systems, only 
discouraging their use in extreme wind areas or extremely turbulent 
sites.

Windy

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