Digest for RE-wrenches at topica.com, issue 1756 [RE-wrenches]

Allan Sindelar allan at positiveenergysolar.com
Thu Apr 21 09:15:37 PDT 2005


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Geoff,
Here's another approach to consider...since the original array is shaded in
the winter, it won't benefit much from MPPT. Put the VLXes on any decent,
cheap controller, like a used C40 (strong, reliable, versatile, and
obsolete) and run the new array only on the MX60. Then the matching problems
are resolved.
Allan at Positive Energy

----- Original Message ----- 
Date: Wed, 20 Apr 2005 07:49:13 -0700
From: Lee Tavenner <solplex at montana.com>
Subject: two arrays

Hi Wrenches.
I am looking for a little advice.   My customer has  a project with
an existing array of  six 53-watt 12-volt panels 150 feet from the
24-volt inverter/batteries, with #4 copper wire to the array.   The
array is in a fair amount of shade in winter.   We are planning on
adding a second array of four 165-watt  24-volt panels located in
better winter sun about 230 feet away from the first array.    We plan
to use an MX-60 controller for voltage conversion and MPPT.  What is
the best arrangement (parallel, series, parallel/series, etc.) of all
10 panels for wiring to  the MX-60 controller and 24-volt
inverter/batteries?

Thank you.

Lee Tavenner
Solar Plexus

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