[Milsurplus] solar panels

Gene Smar ersmar at verizon.net
Sun Oct 3 08:20:15 EDT 2010


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 help appreciated on battery types, regulators, 
> and panels
>
> THANKS MUCH
> Tony
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