... latest UL864&EN54 standard. Key words: Fire alarm Control Panel,conventional fire alarm control panel, fire alarm panel, fire alarm, FACP, fire alarm system, fire ... batteries only, Maximum charging circuit: 27.6VDC @ 0.8 amp for normal flat charge, Maximum battery charger capacity: 18AH battery ... can be housed in the cabinet. Larger batteries require a separate battery box.Total 24 V system power: 3.0 ...