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10. Battery Connection Panels
Connecting and Disconnecting Batteries
Note
For Centralized Architectures, skip this section.
Overview
Battery strings or sections may be connected to the cabinet through contactors and a shunt, fuses
and a shunt, circuit breakers and a shunt, or a shunt only. The shunts in each battery connection panel
are required to obtain a system load reading. The contactor, fuse, and circuit breaker panels are
equipped with alarm cards that report back to the controller if the battery section is taken off the
system bus. Charge and discharge current can be read from the front panel of the Millennium II
controller when battery section shunts are properly wired and programmed.
Disconnect voltage levels on contactor panels are controlled by the Millennium II controller. Fuses and
circuit breakers provide only overload protection for current into or out of the batteries. They do not
provide short circuit current protection of the batteries since they are located in the cabinet and not
at the batteries. They do, however, provide a convenient way to disconnect the batteries from the
system bus for maintenance.
Note: Panels for battery connection are blue; dc distribution panels are white.
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