The WF-8900 Series has revolutionized RV power centers with its lighter weight (7lbs.), decorative doors and superior features. Provides constant 13.6 Vdc nominal output, for reliable operation of electronics and appliances. Automatic three-stage charging extends the life of the battery with output voltage modes of 13.2 Vdc range "float" mode, 13.6 Vdc range "absorption" mode, and a 14.4 Vdc "bulk" charge mode. This unit maintains peace and quiet as the fan runs only when needed. Dimensions: 13.875" W x 11.625" H x 9" D 55 AMP.