DIY: USB-Solar Rechargeable Light & Mobile Charger

Note: A link of PDF Map and pictures of this project would be
available soon here for free download and use.

A Samimy Production

January 15th-2011

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Comments

[cylanan]

do you have the detailed procedure on how to connect the wires ?? i don't know how to connect it ..

[wbilgrami]

Where I get Solar Panels? Solar Panels are not available in Pakistan :(

[imakethings]

i liked the way u made your led holder!

[LUCCHINA]

Very Clever!!!

[ironsmiter]

I dunno about that "3 volt regulator" business...
if it actually puts out between 3.5 and 4 volt when hooked to usb or solar, then great. but a li-po like your cell phone batteries are basically considered "dead" at 3 volt.

Minor note : With three of those cell batteries in parallel (presuming parallel, since series wiring would require over around 12 volt to charge) USB should be safe enough (5volt@450mA max), as would those dreadfully underpowered solar cells(combined 3V unknown current rating, but probably under 200mA). Even USB3 shouldn't be an issue, with 900mA still being close enough to a 1C charge rate, even for smaller cell phone batteries.

However, avoid using AC-USB charging adapters for charging, as some of their current delivery can exceed a safe 1C charge rate, even in parallel battery configuration.

[Samimy]

thanks for the notes,

the solars are able to charge those cellphone batteries, using that voltage regulator,
the batteries are 3.7volts each, but they can be charged even with 2 AA size regular batteries using the 3v voltage regulator as i showed on the video.

the project works great enough, charging with usb is faster than solar.