Power supply system and control device

A power supply system equipped with: a photovoltaic power generation device; a secondary battery unit; a charger for supplying electric power from the photovoltaic power generation device to the secondary battery unit; a DC-AC power conversion circuit for converting discharge output of the secondary battery unit into alternating-current power; and a control device which performs charging control of the secondary battery unit on the basis of predicted power load acquired by taking the moving average of power being used, and the amount of power generated by the photovoltaic power generation device, and which performs switching control of the output of the photovoltaic power generation device to the secondary battery unit or to a commercial power grid on the basis of a state-of-charge of thesecondary battery unit. 种供电装置，具备：太阳能发电装置；蓄电池部；充电器，将太阳能发电装置的电力供给至上述蓄电池部；直流-交流电力转换电路部，将蓄电池部的放电输出转换为交流电力；以及控制装置，基于对使用电力进行移动平均而求出的负载电力预测与太阳能发电装置的发电量，控制蓄电池部的充电，并且对于太阳能发电装置的发电量，基于蓄电池部的SOC，进行向蓄电池部或商用系统电力切换输出的控制。