System of power control of solar batteries is considered. A functional dependence of the maximum battery power on the voltage level which is formed by the method of adaptive corrections is adopted as a base. This dependence provides the maximum battery power at a given irradiation intensity. The managerial system includes a three-phase three-level voltage converter (with a neutral point) with an inductive-capacitive filter and system of converter control. Operation of the system is analyzed in the MATLAB/SIMUINK software environment both in autonomous and in combination with electric network modes of consumer power supply. To prove the proposed principles of converter control, a control system based on Arduino Nano microcontroller was synthesized. The analysis showed sufficiently high efficiency of the considered control system.