The inverter, mainly applied by themiddle/large PV station, is adopted with multi-level filter methods andcontrolled isolation measures to improve the system’s capacity of resistance tointerference. Moreover, the optimal electric and structure design can enhancethe overall cooling efficiency to ensure its reliable and stable operation. Theaddition of insulated monitoring device in DC side and earth leakage protectiondevice in AC side can also advance the safety level for the inverter and thesystem. Besides, the wide temperature range in DC side can help adapt to theaccession of various combination of PV array.