Basic diagram of the plant with buffered storage battery and the volt-ampere characteristics of the photoelectric plant at intensity of solar radiation 900, 710, 660, 300 and 225 W/m(2) are given. It was determined that at using buffered storage battery current variation in the electrolyzer circuit does not exceed of 2-6 A. The voltage is changed between 12.8-14.0 V. Availability of buffered storage battery is ensured power supply in conditions of changing solar radiation intensity. Also basic diagram of the electrolysis plant with small-size regulator of pressure difference is given. It is shown that the regulator provides production of hydrogen and oxygen with high purity (hydrogen-99.98%; oxygen-99.85%) and safely works in wide interval of changing solar radiation intensity.