Answers: What are you wanting to power with it?
A muted?
AC Power or DC powered?
You will end up need for a DC voltage only system:
a mobile AGM or GEL type http://store.oynot.com/concorde-sun-xten...
a solar panel http://store.oynot.com/sunwize-small-pan...
a charge controller to keep the battery-operated from over charging. http://store.oynot.com/xantrex-c35-charg...
For an AC voltage system you will need to donate an Inverter to the works. http://store.oynot.com/product124.html
Remember with kids you could stop up with a fire or an electric shock. You might want to suppose about getting a record from the other kids mom or dad saying you are not responsible for injury or passing before you allow them into it.
Check this site out...
http://www.fishhousesupply.com/generator...
They use them for rime fishing houses but I am sure they would work for your application.
If you are handy you can make one. Otherwise check the internet where on earth to buy one. They come in adjectives sizes.
ITS GOING TO BE A LOT MORE EXPENSIVE THAN YOU THINK BUT I AM SURE THEY HAVE THEM.
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