Solis-(4-5)kW-4G Single phase series string inverter's efficiency has improved dramatically, which could in creasethe amount of electricity generated and recover investment returns more quickly. Solis-(4-5)kW-4G series are suitable for the installation of single-phase input pv system of residential and adopt ultra-high switching frequency, ultra-thin single four-layer board design can greatly reduce the risk caused by the connector. The EPM can be equipped with built-in counter-current controller, which supports multiple communication modes such as RS485, WIFI, GPRS, Ethernet and so on. Real-time monitoring and information control can be realized.