Tracker efficiencies, etc. [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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>Very interesting thread---but has anybody really had problems with 
>"late wake up" Wattsun dual-axis when selecting Array-direct power 
>rather than battery direct, which, I believe, requires an extra 
>conductor to the battery and readjustment of the limits.A little 
>more on this subject please---any latitude considerations? Thanks, 
>guys.  Nick Houser,


A parallel subject - Caution when using Wattsun with some solar water pumps.

Most solar pumps use a controller which has a voltage dropping 
function -- a linear current booster -- which maintains the input 
voltage around the max power point. In these cases Wattsun is 
generally OK, similar to array-direct power connection in a battery 
system.

It will NOT work for pumps that use a pure-DC (brush type) motor with 
no electronics. At low light levels, the motor will drag the array 
voltage down to 0. Pumps of this type include Sunmotor Floating 
Submersibles and Dankoff SunCentric. LCB on centrifugal pumps only 
improves performance slightly and thus is not usually used.

Windy

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