當市(shi)(shi)電(dian)(dian)(dian)供(gong)電(dian)(dian)(dian)中斷或市(shi)(shi)電(dian)(dian)(dian)電(dian)(dian)(dian)壓(ya)超(chao)限 (±15%或±20%額定輸入電(dian)(dian)(dian)壓(ya))時(shi),互投裝置將立即投切(qie)至逆變器供(gong)電(dian)(dian)(dian),在電(dian)(dian)(dian)池組所(suo)提(ti)供(gong)的(de)直流(liu)能源的(de)支(zhi)持下,此(ci)時(shi),用(yong)戶(hu)負(fu)載所(suo)使用(yong)的(de)電(dian)(dian)(dian)源是通過(guo)EPS的(de)逆變器轉換的(de)交(jiao)流(liu)電(dian)(dian)(dian)源,而不是來(lai)自市(shi)(shi)電(dian)(dian)(dian)