... includes 220VDC, 110VDC, 48VDC. In addition, Guotong also undertake DC power system of specific capacity and voltage. ... The products are mainly used in power system, like power plant, hydropower station, substation equipment ... signaling, tele-control, tele-regulation and unattended operation in power system ClassificationAccording to system capacity: 38AH, 50AH, 65AH, 100AH, 120AH ...