BCU master and BMU slave roles
The BCU master controller supervises rack-level measurements, protection states, contactor logic, insulation information, current detection, and communication with PCS or EMS equipment. BMU slave controllers collect individual cell voltage and temperature data and coordinate balancing within their assigned battery modules.
A complete system normally requires one or more control boxes selected from the final pack count, cell count, voltage range, current level, communication design, and safety architecture. The displayed price for a variant applies only to that selected control box.
Information required before selection
High-voltage BMS selection should begin with the electrical architecture rather than a product name alone.
- Total pack voltage, cell chemistry, cells in series, module count, and rack count.
- Continuous and peak current, contactor arrangement, pre-charge design, and protection thresholds.
- PCS and EMS models, CAN or RS485 protocol documents, and network topology.
- Required insulation monitoring, high-voltage interlock, active balancing, remote monitoring, and certification targets.
Supply boundary
The high-voltage kit listing covers the selected BCU master or BMU slave control box. Battery cells, modules, battery racks, high-voltage cabling, contactors, PCS, EMS, inverters, installation, commissioning, and full-system engineering are not automatically included.
