To set up an off-grid solar system, you'll need solar panels to capture energy from the sun, a charge controller to regulate the power going into your battery, and a 12V battery to store the energy. You'll also need an inverter if you plan to power 240V AC appliances. Start by positioning the solar panels where they get maximum sunlight, connect them to the charge controller, and then to the battery. Finally, connect your devices to the system. It’s crucial to ensure all components are properly sized for your energy needs to avoid overloading the system.