To provide a method for solving the problem that a current generated when a load voltage is formed by using batteries is unused, in which it is possible to form voltage by connecting batteries in series and obtain current by connecting them in parallel.

The equal number of batteries are arranged in series and in parallel, and the electric power thereof is extracted in such a way that in the first row, the power is extracted from the first battery, and that at the end of the 22nd row, the power is extracted from the 22nd battery. This makes it possible to extract voltage and current from all of the batteries. Three-phase 200 VAC power is generated by using 264 VDC and 188 VAC voltages, extraction of which is made by distributing 200 V power to 48 locations by a three-phase six-wire method to light 48 200 V×0.5 A lamps. From verification test, two circuits of 10 VAC and 10 A current generated by dropping the 48 pieces of power by 1/20 are converted to direct current and stacked on one 12 V×100 A battery in parallel. Since currents are distributed by 20 A each to all the 484 pieces of batteries, they can support the load as usable currents.