Instructables
Picture of Solar USB charger for cellphone
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This is a simpledevice that uses solar energy for charging mobile phones via USB port, it is very useful if your phone need's recharging in a place where there   is no electricity or if you are on a  camping trip this is a great gadget for recharging phone batery.
I did not put a spare battery in case you can not rely on the sun's energy and it would be good to put two rechargeable AA batteries so that they can recharge the phone battery.
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Materials 

-2x solar panels (one is 3 volts)
-1x USB Charger
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Solar panels connected serial in order to obtain higher voltages
(http://cleangreenenergyzone.com/solar-power-panels-or-cells-in-parallel-circuits/) and don't
forget to use diode on solar panel to prevent it  from damage (1N4041 diode )
Positive end connected to the positive part of the USB board  and negative from the panel to the negative on the USB board.
The panels can give 6v .

yhdesai1 year ago
m a begineer u removed transformer so circuit is incomplete,what to put there
GhoustDoggy (author)  yhdesai1 year ago
I took out a transformer, because I do not need it because the solar panels are 6 volts just conect output from the transformer to the panels If you dont understand send me message :D
in transformer there are total six pins two for input
which two is the output and what are remaining two for
GhoustDoggy (author)  yhdesai1 month ago

I wish I can help you, but this is one of my early projects and I could not find schema for this project, for sure you can say that I used an old usb charger as a voltage stabilizer (this can be done with a voltage regulator LM7805) and as output (USB port) something like this http://www.instructables.com/id/9v-USB-charger/ just instade of 9v battery you can use solar panels whit voltage of 7v to 9 volts, I know that some individuals have been waiting for an answer but I was busy doing other activities.

i have sent message reply fast
eshan20002 months ago

can someone plz send me this pdf.i really need it!!!my email is-eshuparihar39@gmail.com.plz someone send it!!!!

kornedo10 months ago
i dont understand which i should remove and why..whats the use of a transformer??
GhoustDoggy (author) 1 year ago
It is 6v adapter from AC to DC I just remove transformer :D
Ian011 year ago
What kind of USB power adapter is that? I expect that this would only work if it's designed for 6-volt input.
GhoustDoggy (author) 1 year ago
Tnx for comm, I forgot to add that (It's my first instructable ) but tnx for constructiv critic :)
ironsmiter1 year ago
a little more info would be nice :-)

It LOOKS like you hacked the AC/dc side of the circuit board off of a 110vAC to 5vDC usb wall charger. Then wired the serial ganged solar cells into the circuit where the transformer leads used to be attached?