check out the peavey and fender portable speakers/amps they look like eggs. and can be carried easily. I would also look at the roland cube street amps, I almost swear by rolands. that amp is famous for use with buskers.
as for power supply, check out solar powered batteries
http://www.ztostore.com/products/120...iency_452.html I used to use one with my laptop, which gave me an extra 4 hours of juice. It also powered my old controller some years ago. the roland amps are battery powered and I have had 6 hours of use from a full charge
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