Free is good. Simple concept
Although I agree that the instructions could be better or even existing, I think that if you have solar panels you can figure it out. Basically, I think you orient the iPhone north south then pitch it and roll it so the iPhone position values match the calculated sun position. This point the device will be facing the sun.
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Ok. Bad instructions
It would be nice is there was better instructions. As of yet I have not been able to figure out how to use it.