In this paper, we examined the range where the superiority of the DC current power supply system use arises with respect to the minimum storage battery capacity required to secure a constant energy self-consumption rate. As a result, it was found that the DC supply method becomes superior to the AC supply method with a supply-demand balance in which the energy self-consumption rate exceeds 50%. The difference becomes more noticeable as the energy self-consumption rate increases. In addition, the examination results on the power supply system used here showed that about a 19% reduction a year in the battery capacity under the condition that power energy self-consumption is 90% could be expected by introducing DC systems. In this paper, we examined the range where the superiority of the DC current power supply system use arises with respect to the minimum storage battery capacity required to secure a constant energy self-consumption rate. As a result, it was found that the DC supply method becomes superior to the AC supply method with a supply-demand balance in which the energy self-consumption rate exceeds 50%. The difference becomes more noticeable as the energy self-consumption rate increases. In addition, the examination results on the power supply system used here showed that about a 19% reduction a year in the battery capacity under the condition that power energy self-consumption is 90% could be expected by introducing DC systems. In this paper, we examined the range where the superiority of the DC current power supply system use arises with respect to the minimum storage battery capacity required to secure a constant energy self-consumption rate. As a result, it was found that the DC supply method becomes superior to the AC supply method with a supply-demand balance in which the energy self-consumption rate exceeds 50%. The difference becomes more noticeable as the energy self-consumption rate increases. In addition, the examination results on the power supply system used here showed that about a 19% reduction a year in the battery capacity under the condition that power energy self-consumption is 90% could be expected by introducing DC systems.

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