... power is cut off,this rolling door motor (DC&AC available ) will turn to DC24 battery supply ... . 1) manufacture AC, DC, AC and DC Rolling Door Opener, design and make motors according to your request2) ... AC motor: 200KG—1500KG, DC motor: 300KG—600KG, AC and DC motor: ... LOCK BOX, INFRARED SENSOR, ALARM SYSTEM.AC&DC MOTOR LOAD CAPACITY420-450 SETS FOR ONE 20GP ...