What is DC, what is AC?
DC means Direct Current, AC means Amplitude Current. All batteries, and the solar panel, generate DC power. The electricity flows from the battery to one wire, through the device you are powering, to the other wire back to the battery. It’s like a river flowing downstream. AC power is different. In stead of flowing, the electricity “does a dance”. It goes like : One step forward, one step back. The flow goes “to the left” one instant, then “to the right” the next. It turns out, by providing power this way you have less of a loss in transporting electricity over long distances, which is a problem for your power company. This constant dance generates a nice picture on oscilloscopes, called a sine wave.