The WF-9960 model provides 60 Amps and a clean, constant 13.6 VDC nominal output, for the reliable operation of electronics and appliances. Automatic three-stage charging extends the life of your battery with output voltage modes of 13.2 VDC range "float" mode, 13.6 VDC range "absorption" mode, and a 14.4 VDC range "bulk" charge mode. The WF-9900 Series also maintains peace and quiet, as the cooling fan runs only when needed. FCC Class B compliance for every power center model means that the units are designed not to cause interference with televisions, radios, or other signals. Electronic current limiting automatically shuts down the power during overload or short-circuit conditions, protecting the life of your power center and electrical system. WF-9900 Series models provide AC and DC distribution with innovative features. They can accommodate two 50 Amp main AC circuit breaker and up to twelve branch circuits (duplex breakers).