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Solar Charger? Answered

Hello,
I am looking to build a solar charger in a 4x3x1.6 inch (or smaller) box to be as portable as possible. My only problem is, I would like to mount the solar cell on the box. However, all solar cells are far too large to fit this box, I plan to use a rechargeable 9v battery for power storage. I was wondering if I can use a 6v solar cell, and still use a standard LM7805 5v Voltage Regulator to drop 6v to 5v, or if someone could find a 2.5x3.5 inch solar cell (9v) online somewhere (for cheap) that would really help (I've looked everywhere...)

Thanks.

Discussions

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Atul009

5 years ago

take a look at these they are cheap and flexible to be

portable connect them in series in easy language +ve of one solar panel

with -ve of other. 3 of them would make 9v(3v+3v+3v) you can fold one over


other to make it portable. Maximum cost would be $15.More costly it is the more current
will it give and less time to charge, if you want it real cheap them
compromise with it's performance

3V 25mA Flexible Solar Panel MP3-25

3V 50mA Flexible Solar Panel MP3-37

3V 22mA Flexible Solar Panel

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Atul009

5 years ago

take a look at these they are cheap and flexible to be
portable connect them in series in easy language +ve of one solar panel

with -ve of other. 3 of them would make 9v(3v+3v+3v) you can fold one over


other to make it portable. Maximum cost would be $15.More costly it is the more current
will it give and less time to charge, if you want it real cheap them
compromise with it's performance

3V 25mA Flexible Solar Panel MP3-25

3V 50mA Flexible Solar Panel MP3-37

3V 22mA Flexible Solar Panel

0
None
Atul009

5 years ago

take a look at these they are cheap and flexible to be
portable connect them in series in easy language +ve of one solar panel
with -ve of other 3 of them would make 9v(3v+3v+3v) you can fold one over
other. Maximum cost would be $15.More costly it is the more current will it give and less time to charge if you want it real cheap them compromise with it's performance

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jbaker22

5 years ago

Don't spend more than $20 http://www.surplusshed.com/pages/item/k1034.html

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mpilchfamily

5 years ago

A great many problems with that idea. TO start with 9V batteries are the worst. They don't hold vary much power. You would be better off with 6 AAA batteries. If you go 6V cell and battery than you won't be able to use an 7805. The 7805 needs at least 7V to work right. But you can use a 1N4001 diode to drop the voltage by 1V. Next the solar cell will have to produce more voltage than the battery it is charging. The problem with all solar charging packs is it takes a day or more to charge the battery to full. So you'll want a way to charge the battery by plugging it in somewhere. Then the solar panel helps to extend the battery life of the charger. What you might want to do is go out to a local dollar store and get several cheap $1 solar garden lights. See what the panels can put out then solder several together to get the voltage your looking for.