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You might also think about adding a power converter. I installed one of these in an old school bus that we turned into a party bus. It can supply power, charge your battery, and if you get the charge wizard you can leave it plugged in and it will keep your battery charged and in good shape.
Try a Battery Tender Plus. The 2 lights tell you the condition of the battery better than most. They can indicate less than 80% charge, 80-100 % or full charge and come with nice connectors.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.