This is a project to build a battery box that is charged from either a solar photovoltaic panel or via the vehicle alternator. I refer to it as a "powerbox". There are many ready-made powerboxes, from highly portable intended for occasional camping trips, that charge from the vehicle's cigarette-lighter socket (as well as solar), to the more permanent-but-still-removable "hard-core" type, that are wired to the vehicle battery. There are a lot of ready-made powerboxes to choose from on the Aus...
