Small GT inverter question [RE-wrenches]

Tue May 10 20:26:07 PDT 2005

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Allan,

We've probably sent 20 Magnetek's of that hundred out, and have had no
issues to-date, not that that makes a long test! But it is a rugged
unit, and very flexible in application.

Smallest array we can make is (6) Evergreen 110 watt modules at 24V on
either a Magnetek or an SMA 1800. Hurry though, the 24V option for
Evergreens is going away within about a month, to be replaced by 12V
only with potted j/b's (overall a good thing, except when you
occasionally need 24V).

Jeff Wolfe
Global Resource Options

-----Original Message-----
From: Bob Maynard, Energy Outfitters [mailto:bob at energyoutfitters.com] 
Sent: Tuesday, May 10, 2005 6:20 PM
To: RE-wrenches at topica.com
Subject: RE: Small GT inverter question [RE-wrenches]

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Hi Allen,

Take a good look at the PVPowered 1800.  Its input voltage range is
120vdc to 360vdc.  We've had exceptionally good performance and support
from them with several hundred in the field.  The Magnetek Aurora 3000
has an exceptionally wide voltage window, 150vdc to 540vdc.  Its priced
very competitively and has 2 independent MPPT's.  We've been running one
here on our inverter test wall for several months with good results.  It
wakes up earlier and runs later than most.  I think there's around a
hundred or so in the field and have heard no reports of problems.

Regards,
Bob Maynard
Energy Outfitters

-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com]
Sent: Tuesday, May 10, 2005 10:27 AM
To: New wrenches posting
Subject: Small GT inverter question [RE-wrenches]

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Wrenches,
Here's (another) interesting one...We have an unusual request from a
local architect whose neighbor to the south wants to put up a multistory
building that would severely shade his business building.

New Mexico has a solar rights law from 1977 that establishes that "the
right to use the natural resource of the sun's energy is a property
right. A solar right is the right to unobstructed light from the sun to
a solar collector.
A solar collector means any type of solar device which collects not less
than 25,000 btu's on a clear winter solstice day for the purpose
of: -heating or cooling a building; -heating or pumping water;
industrial, commercial, or agricultural processes; -generation of
electricity."
Turns
out that the law is still in force, and 25,000 btus is about a 3' by 3'
surface--it's collection, not generation.

This person wants a small grid-tied PV system mounted on his roof in
order to register a solar right and restrict multistory development to
the south.
He has a small roof area (I haven't seen it yet), and so the fewest
number of modules possible is desireable.

This is especially relevant in that we recently removed 32 KC120s and
Y2K BOS from an upscale home for one of his professional clients who had
bought the place. These modules will be donated to a local school, but
some of them may be available to the architect to use for this purpose.
The KC120s are 12V modules, so minimum voltage is important if these
modules are to be usable here. The Sunny Boy 700 won't work with any
module combination, and the SB1100 needs at least 11 modules, which is
too many.

Who makes the batteryless GT inverter with the lowest threshold array
voltage? Which inverters are the best choice for a very small system? Do
we have to use 24V modules anyway?

Any advice appreciated.

Allan at Positive Energy

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