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

[Geoff Greenfield]

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I just blew an mx-60 going from 72 down to 24... software patch is on the
way and I will report.

Re: the different arrays (and different panel MPP characteristics) in
different locations with different wire home runs - My instinct would be to
keep each array on separate charge controllers - perhaps living with the old
one for the existing array if the budget wouldn't support twin Mx-60s.  To
follow up on instinct one could pencil out the lost potential PV production
and MPPT advantage and balance it against extra cost...  I guess it is amps,
not voltage that takes a dive with shading, but I still expect losses from
mismatched panels and wire home runs... What say ye wrenches? split the
arrays or bond them?

For a brighter energy future,

Geoff Greenfield
NABCEP Certified Energy Practitioner

THIRD SUN SOLAR & WIND POWER Ltd.
340 West State Street
Athens, OH 45701

www.third-sun.com
(740) 597-3111
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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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