Planning
When planning our system we started with determining how much power we would need for three days without ANY sort of charge. No shore power, no solar, no alternator. This required lots of super fun research and math. Yay math! Ah(Amp Hours) is the unit that a deep cycle battery's capacity is measured in. To come up with the amount of Ah we needed for those three days without charge we took the items we use everyday and figured out their draw in Ah. This is where the math comes in.