We usually measure or convert the watts into amps of solar panels to figure out how much current (amps) is being stored in the battery. Or we measure the amperage of the solar panel output to select the wire sizefrom solar panels to.
This manual is designed to guide you through the most significant considerations to bear in mind—technically, logistically, financially—when selecting a containerized solar unit that best meets your individual energy needs. What Is a Solar Containerized Energy Unit?.