Electricity, and how do you make it.

[jester]

They do have a power converter that allows one to switch from AC to DC, and adjust from 12 to 24 volt as well. These items would be found at boating and RV stores where one can find all maner of appliances designed for those types of craft. I personaly would go with items from the boat stores as they tend to be more weatherproof and durable although a bit more pricey.