Solar Charging Trailor

I'm already getting Burning Man brain (even though I won't be there until the end of August).  Power is always one of the biggest challenges of our camp, Freestyle Palace.   My hope is to eventually power our lighting at night with a battery that has been solar charged during the day.  This would really save the wear and tear on our smaller generators and also save us a lot of gas.  I came across this video showing how to make a home made solar trailer. This would be perfect!!