The article examines the problem of power supply of low-power devices remote from stationary power sources. The structural solutions of autonomous power supply systems of high and low power, which use renewable energy sources, are considered. It is shown that in autonomous micro and low-power power supply systems, MPPT-type controllers do not provide technical and economic advantages compared to controllers in which, due to simple structural and circuit design solutions, the necessary but sufficient minimum of functions for charging and discharging the energy storage of the power supply system is implemented. The models of circuit solutions of the controller nodes are presented, which implement the necessary minimum of functions for charging and discharging the energy storage device and the results of experimental studies showing the operability of the proposed circuit solutions.

Keywords: power supply system, controller, renewable energy source, pulse voltage converter, battery, voltage limiter