MX60 at cold weather VOC [RE-wrenches]

Kurt Nelson sunwise at cheqnet.net
Mon Aug 23 09:37:39 PDT 2004 

 

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I'd ask the same question regarding the use of 6 Shell SQ80's in series.
Voc about 126 and it is colder here in WI.  My guess is we limited to 5
in series?  I ask this in part because I find it convenient to sell an
expandable system, say a 24 volt system consisting of four SQ80s on a 12
module rack wired for (and wire sized) for 24 volts.  Then as they need
to add modules, do so in series, with the current (wire size) remaining
the same.  

BTW, I still use 80 watt modules in some 24 volt systems.  The big
modules are hard to find, priced at a premium, shipping kills you, and
while racking may go faster with the large modules, it pretty much takes
two people.  Also, as we are about to learn, you can't put three (or two
and a half) SQ170s in series.

Kurt Nelson
SOLutions

-----Original Message-----
From: Kirk Herander [mailto:kirk at vtsolar.com] 
Sent: Monday, August 23, 2004 10:24 AM
To: RE-wrenches at topica.com
Subject: MX60 at cold weather VOC [RE-wrenches]

 

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Outback Chris & group,

I'd like to use the SANYO 190 watt modules in a particular installation.
They are rated at 67.5 VOC (54.8 vmppt). The MX60 will accept up to 140
VOC, so I could wire up pairs in series and obtain 135 VOC. But in these
parts we have to design for -20 degree or greater winter mornings. That
means an up to 25% increase in VOC, or 169 VOC. Chris, is this too high
for the MX60 to handle on the occasional (or sustained) cold winter day?
 
Kirk Herander
Vermont Solar Engineering
802.863.1202
fax 802.863-7908
NABCEP(tm) Certified Solar PV Installer
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
VT Solar and Wind Partner


-----Original Message-----
From: Bob Ellison [mailto:ellison at gisco.net] 
Sent: Sunday, August 22, 2004 6:49 PM
To: RE-wrenches at topica.com
Subject: RE: Satellite Internet query [RE-wrenches]

 

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Allan,
I have friends with both. Directway is no problem, Starband seems to be
a
problem.
Every message my friend with Starband sends me gets picked up by my
ISP's
virus trap.
They (Starband) have been of no help. If he takes the same computer and
sends me a message from another location it comes in fine. There is
nothing
on his computer.
This has got me ready to go to Directway, I wouldn't go with Starband
after
this experience.
The cost still scares me.....

Bob

RE. Ellison
Supplier of;
Alternative Energy Systems & Supplies
34642 Countryman Road
Theresa, NY. USA
                               13691-2076


-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com]
Sent: Saturday, August 21, 2004 3:45 PM
To: New wrenches posting
Subject: Satellite Internet query [RE-wrenches]




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Wrenches,
I would appreciate suggestions, experiences, preferences, etc. comparing
Starband and Direcway satellite internet providers and hardware, as we
prepare to purchase a system for our offgrid home. Thanks in advance.
Allan at Positive Energy

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