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The battery inside the Kindle is a 3.7V Li Poly so wiring in your 8+V solar cells would be an extremely bad idea. Even with the 0.7V diode drop, you're going to be trying to feed it a significantly higher voltage than it is expecting. If you've wired all the solar cells in series then you're just going to end up with around 10mA in total and that is nowhere near enough to charge the Kindle considering it is expecting 500mA+.
The micro USB socket on the bottom also only will take 4.75V to 5.25V.
Charging a lithium battery directly isn't simple either. If you just try to charge it without the correct monitoring circuitry then you're risking a lithium fire.
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