To set up an off-grid solar system, you'll need solar panels to collect sunlight, a charge controller to manage the power going into your battery, and a 12V battery to store that energy. You’ll also need an inverter if you plan to power 120V AC appliances. Start by installing the solar panels in an area with maximum sunlight exposure, connect them to the charge controller, and then link it to the battery. Finally, connect your devices. Make sure all components are properly sized for your energy needs to avoid overloading the system.