The Pro is right. Most farmers markets and other outdoor venues have AC power available. And, if they do not, all you need is a DC/AC 110-volt inverter, which you can attach to any battery. Keep in mind, however, that it will take a fairly hefty battery to power a 200 watt system for any length of time. Most marine batteries range from 150 to 200 ampere hours, which would provide you with about three hours of performance time using the 2200 system.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)