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idea for embedded linux class..

.. that combines embedded linux, the stuff i'm learning in my real-time programming class (ecp3), and green technology (photovoltaics).

- embedded linux part is covered by the gesbc-2440 running LAMP.
- ecp3 stuff and green technology. these are trickier, because i'm not entirely sure whether it will work. i want to power the SBC with photovoltaics. the SBC requires a 5V, 0.6A power supply. can the power supply be replaced with solar panels somehow? am i going to have to spend like a ton of money on them? as for ecp3 stuff.. i want to run this webserver 24/7. during the day, it runs off of solar power. during the night, it runs off of the wall outlet. to be more specific, i want to set it up so that it runs on solar power whenever there is enough sunlight. otherwise, it runs off of the wall outlet. but when there is sunlight, i don't want the power supply to be sucking electricity (phantom power), so i need to set up a circuit that will cut power to the power supply when it detects that the SBC is being powered by sunlight. i also need to somehow connect both the power supply and the photovoltaics together to the SBC so that, if there is "overlapping" power being supplied, the SBC doesn't blow up.