[RE-wrenches]

[Lee Tavenner]

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Hi Rick, Allan, Darryl, Kent, Geoff, and Wrenches.

Thanks for your suggestions on the two arrays project. Still looking 
for solution with fewer negatives.   The new array is 230 feet on the 
other side of the old array from the house, and the #4 copper from the 
house to the old array is buried, so I would prefer a 1-controller 
solution that doesn't require 2 more wires from the old array to the 
house.

How about wiring the 6 VLX 53s with 3 each in two series strings, and 
the two strings in parallel?  Then wire 2 of the 165s in series and 2 
more of the 165s in series, and parallel these two 2-165 strings.    
This results in a 36-volt nominal 6.2 amp old array and a 48-volt 
nominal 9.7 amp new array.  Then wire these two arrays in parallel.   
Net result--nominal 42 volt array with MPPT around 60.  In parallel the 
voltages go to the average and the amperages add.  Total power should 
be the sum of all 10 panels.  Would there be any mismatch losses?  If 
so, how would you calculate or  estimate these losses?  Any reasons I 
should not do this?  Thanks for you input.

  Lee Tavenner
Solar Plexus

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