當市(shi)(shi)電(dian)供(gong)電(dian)中斷或市(shi)(shi)電(dian)電(dian)壓超限 (±15%或±20%額定輸入電(dian)壓)時(shi),互投裝(zhuang)置將立即投切至逆變器(qi)供(gong)電(dian),在電(dian)池組所(suo)提供(gong)的直流(liu)能源(yuan)的支持下,此時(shi),用戶負載(zai)所(suo)使用的電(dian)源(yuan)是通過(guo)EPS的逆變器(qi)轉(zhuan)換(huan)的交流(liu)電(dian)源(yuan),而不是來自市(shi)(shi)電(dian)