The system for determining the state of autonomous generators based on internal combustion engines is designed to determine the main energy specific indicators of generating equipment. The system is based on an improved method of compression testing of internal combustion engines. Comparison of starting currents in different modes of operation of the generator, allows you to establish the degree of wear of the equipment. The main components of the system include current measurement sensors, an analog-to-digital converter and a personal computer. The simplicity of the method allows you to quickly and conveniently establish the state of the equipment and the remaining resource.