SOLAR CONTROLLER, METHOD, NON-TRANSITORY STORAGE MEDIUM, AND VEHICLE

A solar controller is configured to control a solar unit including a solar panel, a step-up and step-down DC-DC converter configured to receive electric power generated by the solar panel, convert the received electric power to a predetermined electric power, and output the predetermined electric power, and a regulator circuit provided between an output of the DC-DC converter and a ground potential. The solar controller includes one or more processors are configured to: acquire an input and output voltages of the DC-DC converter; acquire an input and output currents of the DC-DC converter; control the regulator circuit and a plurality of switching elements that respectively make up a plurality of arms included in the DC-DC converter; and determine whether an abnormality in each of the arms has occurred based on the input and output voltages or the input and output currents, that is acquired.