The rated voltage of a 60W solar panel typically operates within the range of 18 to 22 volts. Commonly, a 60W solar panel is designed to produce 12V, making it suitable for use in off-grid systems, such as charging batteries and supplying energy to appliances. Vmp (maximum power voltage) is the. While nominal voltage is the standardized voltage that's used to classify solar panels (usually, 12V, 24V, or 48V), the actual operating voltage of a solar panel is different. Purpose: It helps solar energy professionals and DIY enthusiasts understand the electrical characteristics of their solar panels. ” – EK SOLAR Engineering Team Why does.