[Milsurplus] [armyradios] Re: solar panels

[jcoward5452 at aol.com]

What is the mechanism that causes degradation in output power? I do not intend to have these in the sun permanantly, just for emergency and occasional portable use.
 Jay KE6PPF






-----Original Message-----
From: Scott Johnson <scottjohnson1 at cox.net>
To: armyradios <armyradios at yahoogroups.com>; ersmar <ersmar at verizon.net>; trsnider <trsnider at cox.net>
Cc: milsurplus <milsurplus at mailman.qth.net>
Sent: Sun, Oct 3, 2010 8:38 am
Subject: RE: [armyradios] Re: [Milsurplus] solar panels


 



Beware, those are amorphous cells, and will be 22 watts after six months.  Not that it isn’t useful, just don’t count on the 45W for long.  
 
Scott W7SVj
 

From: armyradios at yahoogroups.com [mailto:armyradios at yahoogroups.com] On Behalf Of jcoward5452 at aol.com
Sent: Sunday, October 03, 2010 8:22 AM
To: ersmar at verizon.net; trsnider at cox.net; armyradios at yahoogroups.com
Cc: milsurplus at mailman.qth.net
Subject: [armyradios] Re: [Milsurplus] solar panels

 
  


Harbor Freight has a 45 watt panel with a regulator kit that was recently on sale.I bought two but have not set them up yet  I have two 12V deep cycle batts I use to  keep a few things running when the power goes out here during the rainy season and to power green radios of course!

Jay KE6PPF

 

-----Original Message-----
From: Gene Smar <ersmar at verizon.net>
To: Tony Snider <trsnider at cox.net> ;; armyradios <armyradios at yahoogroups.com>
Cc: milsurplus <milsurplus at mailman.qth.net>
Sent: Sun, Oct 3, 2010 5:20 am
Subject: Re: [Milsurplus] solar panels

Tony:
 
     Whatever solar panel you decide on, don't forget to buy a charge 
controller to go with it.  Solar panel DC output is very erratic, depending 
on sunshine (a.k.a insolation) and the output voltage can climb to somewhere 
around 140-150% of nominal batt terminal voltage.  E.g., a "12 VDC" solar 
panel could actually produce as much as 17 or so volts in bright sunshine. 
You'll need to have the controller between the panels and batts to maintain 
the proper charging voltage being fed to your batts.
 
     The controller will also shunt any excess energy when your batts are 
fully charged (their terminal voltage is at 28-29 VDC
) so you don't 
overcharge the batts.  (That's one problem with solar energy - you can't 
afford a large enough battery plant to hold all the energy that can be 
produced on a really sunny day.  This excess energy only raises the batt 
voltage, possibly damaging the cells.)
 
73 de
Gene Smar  AD3F
 
 
 
----- Original Message ----- 
From: "Tony Snider" <trsnider at cox.net>
To: <armyradios at yahoogroups.com>
Cc: <milsurplus at mailman.qth.net>
Sent: Sunday, October 03, 2010 1:23 AM
Subject: [Milsurplus] solar panels
 
 
> Hello,
> I have a S-280 comm shelter I have mounted green radios in and I want use 
> a solar charger, does anyone have any panels for sale or a good source?? I 
> am looking for 24VDC to charge lead acid batteries?
> new to solar systems so any h
elp appreciated on battery types, regulators, 
> and panels
> 
> THANKS MUCH
> Tony
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