Sunways STM is a bidirectional smart meter supporting various grid voltages and grid types, which collects voltage, current, active power, reactive power, active energy, reactive energy, and other information and records the real-time power and energy that feed in and take from the grid. Together with Sunways Monitoring system,the STM records and presents varios energy flows data such as self-consunption. Thanks to the rapid communication with Sunways inverters via Modbus RTU interface, it can fast process export limitation & control with on-grid inveter and realize perfect coordination among hybrid inverter, PV string, battery, grid and loads,optimized the whole system energy management and improved self-sufficiency rates.