Solar powered charging mechanisms for the iPhone are not exactly new. Apple is learned to be developing a technology that will incorporate a solar panel on the iPhone’s back casing. More recently, we had written about a USB solar power charger for the iPhone that can offer some nice battery backup for your iDevice.

Now, here is another solar solution that is more convenient to use. A design company called FrostFire has released a new iPhone 4 case called Mooncharge that will also double up as a solar charger. The back side of the casing has a large solar panel that will generate power off direct sunlight and this is stored on a rechargeable lithium-ion battery at the base of the panel. The manufacturers say that twenty minutes of charging can provide 5 minutes of talking-time or 50 minutes of standby – nothing huge, but is still significant considering you will be saving significant power over a long-term. Of course, the device can also be charged via a USB cable off your wall-charger.

The Mooncharge iPhone 4 casing costs $70.

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