Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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If you decide to use batteries, keep in mind that they will have to be maintained, and then replaced after a certain number of years. The PV modules should last 20 years or more, but batteries just don't have that kind of useful life. Batteries in PV systems can also be very dangerous because of the energy they store and the acidic electrolytes they contain, so you'll need a well-ventilated, non-metallic enclosure for them.
Hmmm that gives me an idea for 250 hamster wheels connected in parallel . . . think of the power!