Question 1

What is the 4U - 250A Center Tap RBMS?

Accepted Answer

It is a high-voltage RBMS main control unit for battery energy storage and UPS applications. It uses a 4U 19-inch rack design, supports center-tap/three-wire systems, a 250A rated current, and 350V/600V/1000V voltage levels.

Question 2

What applications does this RBMS support?

Accepted Answer

It is suitable for PV power plant storage, micro-grid applications, UPS power supply, and power system 220V DC power supply.

Question 3

What system architecture can it form?

Accepted Answer

It can form a minimum two-level architecture (BMU + RBMS) for 1KWh-50KWh systems. With an industrial computer and battery stack management software, it can also form a three-level architecture (BMU + RBMS + SBMS).

Question 4

What voltage levels are available, and how is the rated voltage calculated?

Accepted Answer

Two main-control voltage levels are available: 350V for 120-350VDC, and 600V for 260-600VDC. The actual rated voltage depends on the battery configuration. For example, 4S15S LiFePO4 modules: 4 * 15 * 3.2V = 192V; 8S15S: 8 * 15 * 3.2V = 384V.

Question 5

What are the rated current, sampling accuracy, and power consumption?

Accepted Answer

Rated current is 250A. Current sampling accuracy is 1%FSR. Power consumption is less than or equal to 25W for three-wire / center-tap systems.

Question 6

Can multiple RBMS units be connected in parallel?

Accepted Answer

Yes. It supports automatic circulation control and automatic parallel/offline control. A 4-bit DIP switch supports up to 15 RBMS units in parallel, and ID allocation must start at 1.

Question 7

What communication interfaces are available?

Accepted Answer

It provides CAN communication with BMU, RS485/CAN communication with UPS and SBMS, Ethernet communication with monitoring software, dry contact I/O, TCP/IP, T-CAN/T-485, COM-IN/COM-OUT, HMI port, and BMU-OUT.

Question 8

What protection and management functions does it provide?

Accepted Answer

It supports battery charge/discharge management, battery temperature management, IAP upgrade, system protection parameter setting, short-circuit protection (600V, 6KA, 20ms), pre-charge, event recording (5000pcs), and DC start.

Question 9

Does it support center tap/three-wire and external HMI display?

Accepted Answer

Yes. It supports positive half-cluster and negative half-cluster battery connection, with B+ B- terminals for each half cluster and P+ N P- power port. Center tap is optional. External HMI display options include 4.3-inch and 7-inch, depending on the model code.

Question 10

What are the installation, environmental, and certification details?

Accepted Answer

It is suitable for standard 19-inch cabinet installation with front-side in and front-side out wiring. Dimensions are 482 * 140 * 450 mm, weight is about 10 kg, protection level is IP20, operating temperature is -20 degrees Celsius to +60 degrees Celsius. It complies with CE certification standards and relevant GB/T standards. Reliable grounding is required, with grounding resistance less than 1 ohm.

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