What Can A 100 Watt Solar Panel Run? What can a 100 watt solar panel run? This is a typical question from newcomers in the world of solar power. Generally, when we design a solar power system, we start with a load list. We determine what you are trying to power. From there, we figure out what size solar panels you need. But for this scenario, we will be doing things in reverse. What can you power with a 100W solar panel?