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charge a backup battery with a portable solar panel.?
I Would like to know the most efficient way to charge a Proporta USB TurboCharger 5000 with a Goal0 Nomad 7 solar panel. would the 12v or the usb the best charging solution? do I need to rig up some sort of circuitry to charge it?
Maybe two of these http://cgi.ebay.it/700mA-Solar-Placa-Panel-Modulo-Cargador-5V-USB-Bateria-/220737049789?pt=LH_DefaultDomain_186&hash=item3364f414bd in parallel would be a better solution?
Thanks in advance.
Yes it would work by using a voltage regulator to keep the voltage stable.. Without it the panel voltage will not be controlled when the voltage goes up and down during sunny days, and it could damage your battery. 12v panels can range from 15-20v depending on the panel you have. This is what I did to control the voltage output to my phones and DSL box. My phones require 6v, and my DSL box require 12v. The output should match the input voltage to your device. Here's what they look like, and how to hook them up. You may have to double them if your pack draws more power, they put out about an amp of power, and should be mounted on some metal to dissipate the heat. A 10w 50 ohm ceramic resistor will help as well splicing it in from your panel + to your regulator input +.
http://t2.gstatic.com/images?q=tbn:ANd9GcT8G50t6DGgrTWBGI6OJjbqrkkSnojz7sq4MUrhGdlZ0CDoZax-
http://t0.gstatic.com/images?q=tbn:ANd9GcTHETqOcODNADo8L_LPpqvc4MHwangsxsmG39sckcIFvsB9VQkuFw
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