SAJ CB3-M20
Description
Heavy-duty motorized DC isolation with integrated pre-charge.
SAJ CB3-HVC is a 1000 V / 200 A commercial master BMS controller and high-voltage DC distribution unit, engineered to oversee battery diagnostics, pre-charge safety, and inverter communication for SAJ CB3 liquid-cooled storage systems.
1000 V / 200 A High-Voltage DC Management
Controls high-power battery racks across a wide 150–1000 V window, delivering up to 150 kW+ continuous throughput.
Integrated Motorized DC Switchgear
Built-in heavy-duty contactors and pre-charge circuits protect the battery bank against short circuits and inrush currents.
Central Multi-Rack BMS Coordination
Collects real-time diagnostics from all connected CB3-M20 modules, executing active balancing and thermal protection.
Direct Handshake with SAJ CH3 & CM2 Inverters
Native communication protocols ensure seamless, plug-and-play integration with commercial PCS stations.
More product details
Engaging a 1000 V DC battery bank directly into an inverter causes violent capacitor inrush arcs that damage contactors. The CB3-HVC integrates motorized contactors and an intelligent pre-charge circuit.
- Automated pre-charge circuit ramps DC bus voltage safely before main contactor closure.
- Real-time insulation resistance monitoring detects ground faults and executes sub-second disconnects.
- 200 A continuous current rating handles heavy charge and discharge power without thermal derating.
SAJ
Compare different models
Scroll sideways to compare every model.
3 models
Ingress protection
IP20
IP20
IP55
Operating temperature
-20°C-55°C
Charging 0~55°C; Discharging -10~55°C
-25~55 °C
Weight
35 kg
148 kg
≤2400 kg
Dimensions
530*995*170 mm [W*D*H]
530*995*240 mm [W*D*H]
103*2300*1400 mm [W*H*D]
Centralized cell diagnostics and commercial inverter synchronization.
The CB3-HVC aggregates real-time data from all sub-BMS units across the connected CB3-M20 modules, optimizing state-of-charge balancing and communicating with the PCS. Active cell-balancing logic ensures all 280 Ah cells remain synchronized across multi-year cycling. Dual communication channels (CAN for inverter control, Modbus TCP for plant SCADA). Direct plug-in mounting in the top control bay of the CB3-L261 liquid-cooled container.
Wide voltage window.
150-1000 V covers the modular CB3 string as module count changes.
Light IP20 unit.
35 kg and 170 mm deep. Spec it as controls hardware beside the modules, not as storage.
Technical data
Centralizing high-voltage safety, cell diagnostics, and inverter synchronization for megawatt-scale storage.
1000 V / 200 A commercial master BMS controller and DC distribution gateway.
Designed to oversee utility-scale and large commercial CB3 battery stacks, the CB3-HVC master control unit manages operating voltages up to 1000 V and continuous currents up to 200 A. It integrates high-speed DC contactors, insulation monitoring, and CAN/Modbus communication to synchronize battery racks with commercial hybrid and AC-coupled PCS units.
- High-Voltage Ceiling
- 1000 V
- High-Current Throughput
- 200 A
- Contactor Protection
- Pre-Charge
- Dual Protocols
- Modbus / CAN
Power & Config
- Type
- High-voltage control module, CB3 Series
- Function
- Cluster control, DC switching, BMS communication
Battery & Charge
- Rated charging / discharging current (A)
- 157
- Max. charging / discharging current (A)
- 200
Physical & Environment
- Dimensions (W x D x H mm)
- 530 x 995 x 170
- Weight (kg)
- 35
- Ingress protection
- IP20
- Operating temperature range
- -20 C to 55 C
- Ambient humidity
- 5% ~ 85%
- Altitude (m)
- 3000
Project fit
Where this model fits.
Scenarios that show which projects the SAJ CB3-HVC belongs in, what to verify before quoting, and when another model is the better pick.
Project scenario
Required Master Controller for SAJ CB3-L261 (261 kWh) Systems
Mandatory control head unit whenever deploying an SAJ CB3-L261 commercial liquid-cooled storage cabinet.
Pre-configured with the specific firmware, voltage windows, and contactor ratings required to manage thirteen CB3-M20 modules in series.
What Linker confirms with you
- Confirm this model against the adjacent rating in the same family
Documents
SAJ CH3 and CB3 Series 75-125 kW datasheet (EN)Product questions
What is the primary role of the CB3-HVC in a commercial storage system?
Master BMS coordination, motorized DC isolation, and inverter communication. The CB3-HVC acts as the brain and primary electrical safety gate: it continuously monitors all cell voltages and temperatures, commands the motorized DC breakers to open in the event of an electrical fault, and provides real-time state-of-charge data to the hybrid inverter.
System components
Required components
SAJ CB3-HVC cluster control / BMS unit
Item number: DLK-SAJ-CB3HVC
CB3-M20's own live spec sheet: 'Control module = CB3-HVC (required, sold separately)'.
Recommended components
SAJ CB3-M20 stackable module or CB3-L261 liquid-cooled cabinet (60–260 kWh per cluster)
Item number: DLK-SAJ-CB3M20
SAJ's CH3 + CB3 datasheet, verbatim: 'The battery is compatible with SAJ CH2 and CH3 series inverters,' 60 to 260 kWh per cluster.
Approved pairings
SAJ CH3-100K-T8Item number DLK-SAJ-CH3100KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-110K-T8Item number DLK-SAJ-CH3110KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-125K-T8Item number DLK-SAJ-CH3125KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-75K-T6Item number DLK-SAJ-CH375KT6CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-80K-T6Item number DLK-SAJ-CH380KT6CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-99.9K-T8Item number DLK-SAJ-CH3999KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ H2-10K-T3 (10 kW three-phase hybrid inverter)Item number DLK-SAJ-H210KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-12K-T3 (12 kW three-phase hybrid inverter)Item number DLK-SAJ-H212KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-15K-T3Item number DLK-SAJ-H215KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-20K-T3Item number DLK-SAJ-H220KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-25K-T3Item number DLK-SAJ-H225KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-30K-T3-DEItem number DLK-SAJ-H230KT3DEB2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ HS2-10K-T2-XItem number DLK-SAJ-HS210KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
SAJ HS2-5K-T2-X (5 kW three-phase hybrid inverter)Item number DLK-SAJ-HS25KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
SAJ HS2-6K-T2-XItem number DLK-SAJ-HS26KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
SAJ HS2-8K-T2-XItem number DLK-SAJ-HS28KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
