Re: solar panel back cover .
 

How do you know that "n900 can handle up to 1200mA"?

Re: solar panel back cover .
 

havent you checked the output rating on your charger?

Re: solar panel back cover .
 

kinetic charger
http://www.gizmag.com/npower-peg-use...devices/10716/

Re: solar panel back cover .
 

Oh my god, this is a backpacker's dream!

Re: solar panel back cover .
 

Total marketing gimmick, the panel is way too small to provide any significant power.

Re: solar panel back cover .
 

This really is a great idea, but unfortunately wont work.

You'd need roughly a 1 foot by 1 foot panel to generate enough mA at 5V to actually power and maybe charge the N900 (in full direct sunlight).

You'd also need a power regulator to keep the voltage at 5V no matter where you point the panel... a 6V panel will go to almost 12V in the sun (unloaded), and barely 0.5V indoors.

Which brings me to my next point. If you want to be able to charge the N900 and *not* have to leave it in the sun, you're going to need at least a 1m x 1m 24V panel... In the shade, it will maybe *just* be able to produce 5V (loaded) and a few milliamps. Maybe just enough to power the N900, but doubtful enough to charge it.

Re: solar panel back cover .
 

sold sold sold

Re: solar panel back cover .
 

I actually had this on my first mobile phone.
It was a Nokia 1610 and took credit-card sized SIM cards, so this was a long time ago, in the early years of GSM. It had more surface area than modern phones, even than the N900.
Nokia sold a battery with solar panel on the back. The idea was to just leave the battery lying in the sun - not the whole phone.

Re: solar panel back cover .
 

Here's what you want:

http://www.amazon.com/USB-AA-Solar-P...7655274&sr=8-1


Solar panel trickle-charges AA rechargeable batteries, which themselves output stable 5V over USB.

I have one... works great for charging anything over USB!

5 ounces w/o batteries, 6.8 ounces with (comes with pair of Sanyo Eneloops... bets NiMH you can get.)


;>

Re: solar panel back cover .
 

great idea also great risk.
One most importantly is that customising the charge pattern of the N900 may causing a problem to the battery's life via back cover. It may be too slow to charge the battery to the speed of the battery being consume by the device. The only way to get it working is to get light but would you risk your expensive device to be sitting in a hot sunny day?