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

[Rick Cullen - Blue Sky Energy]

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Lee,

You might consider two of our new SB3024i's. One would run the old array and
one would run the new array. The two SB3024i's will network together without
special communication hardware and will behave as a single charge controller
with a single set of charge setpoints, and can share a single battery
temperature sensor and optional display. When the system is in bulk each
controller will independently MPPT their it's array while the two
controllers will charge the battery in a coordinated manner as a single
machine.

Regards,
Richard A. Cullen
Blue Sky Energy, Inc.
760-597-1642 x102
Fax 760-597-1731
mail; rick at blueskyenergyinc.com
www.blueskyenergyinc.com

----- Original Message -----
From: "Geoff Greenfield" <Geoff at Third-Sun.Com>
To: <RE-wrenches at topica.com>
Sent: Thursday, April 21, 2005 6:14 AM
Subject: RE: Digest for RE-wrenches at topica.com, issue 1756 [RE-wrenches]


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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
------------------------------------------------------------

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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