The relevance of the research is caused by the need to develop energy efficient power supply system of the spacecraft. Purpose of the research: The synthesis of inverter and transformer structure of the power supply system of the spacecraft based on current inverters that allows implementing a mode of the maximum power point tracking of solar batteries when designing power supply systems with any output voltage. Research methods are based on general theory of electrical circuits, theory of algebraic equations, computational methods and the use of modern instrumentation systems and methods of mathematical modeling. Results: The authors have proposed the structure of the power supply system of the spacecraft summing output currents of inverters in a general node, which allows adjusting solar battery voltage in a range sufficient to implement a mode of the maximum power point tracking. The adjustment characteristics of the converter at drift of current-voltage characteristics of solar battery and different values of the load were obtained. It is shown that in current summing systems the position of the working point of the current-voltage characteristics for the solar battery does not depend on load power.