Posted by BobG on July 1, 2005, 9:10 am
I've seen 6v panels. Seems like a 3v panel could charge up one of those
supercap energy banks, then a regular dc to dc converter could go to
the batteries/load.
Posted by William P. N. Smith on July 1, 2005, 9:43 am
>I've seen 6v panels. Seems like a 3v panel could charge up one of those
>supercap energy banks, then a regular dc to dc converter could go to
>the batteries/load.
You _could_ do that, but wiring losses (lower voltage, higher current,
remember?) and conversion losses would make it a losing proposition.
Posted by Kent Hoult on July 1, 2005, 11:08 am
Here is a 4V, 100mA panel for only $3.50..
http://www.goldmine-elec-products.com/prodinfo.asp?number=G4481&variation=&aitem=5&mitem=9
But you never mentioned how much power you were trying to get....
> I've seen 6v panels. Seems like a 3v panel could charge up one of those
> supercap energy banks, then a regular dc to dc converter could go to
> the batteries/load.
>
Posted by BobG on July 19, 2005, 1:46 pm
But you never mentioned how much power you were trying to get....
========================================
Trying to figure out how to use those 2.5V supercaps. If you wire the
PV stack to be 2.5V open circuit, and have severl 1000 farads of
supercap, a DC to DC converter/PWM controller could step up the cap
voltage to 14.5 or 13.6 or whatever was needed. Seems like they series
the 2.5V supercaps to increase the voltage, but that cuts the farads in
half. Having the PV stack produce 2.5V max seems like a big win to me.
Posted by John P Bengi on July 3, 2005, 5:41 pm
I have one on my solar ball hat. It runs the face fan on the brim.
> I've seen 6v panels. Seems like a 3v panel could charge up one of those
> supercap energy banks, then a regular dc to dc converter could go to
> the batteries/load.
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>supercap energy banks, then a regular dc to dc converter could go to
>the batteries/load.