Three-Phase String series inverters not only are diversified products providing optional DC switch, integrated DC combiner box, optional PID protection module and GPRS/WiFi/RS485 wireless communication, which can match the requirement of different customers, but also can support 10% rated overload which efficiently decrease initial investment of system, plus standard warranty for 5 years, optional extended warranty for 10-25 years and smart operation platform, which can efficiently guarantee the maintenance of the whole life cycle