Complete 240S 768V 250A High-Voltage BMS System Configuration
A fully integrated high-voltage rack battery management solution comprising three core components: rack master RBMS, cell monitoring slave BMU, and dedicated signal harnesses, fully compatible with lithium iron phosphate energy storage battery packs.
- 1 set Rack Master BMS: Model RBMS07-S20-250A-768V
- 15 sets of 16-channel Slave BMU: Model BMU08-16S8T48F (each monitors 16 battery cells)
- 15 sets of custom wiring harnesses for 16S modules, covering three cable types:
- Cables for cell voltage & multi-point temperature collection
- Shielded communication cables with Shenji port for cascaded BMU connection
- Independent power supply cables for cooling fans
Basic Specifications of 12S~24S Universal Slave BMU
- Temperature detection: 8 built-in temperature sensors per unit
- Fan power supply options: 48V for 12S-16S modules, 12V for 17S-24S modules
- Voltage sampling range: 0~5V
- 12V auxiliary power input
- Static power consumption ≤20mA
- Communication protocol: Industrial CAN2.0B bus, supporting multi-unit cascading networking
Wiring Harness Specifications
- Cell signal acquisition cables: 18P+20P multi-core integrated wires, standard lengths: 600mm / 900mm / 1200mm
- Separate temperature sensor cables with identical length options
- Fan power supply short cables: Fixed standard length 600mm
- Cascaded communication shielded cables: Used for serial connection between RBMS master and each BMU slave
- Reserved terminal port on the last BMU allows connection of 120Ω matching resistor to eliminate communication interference
Core Advantages of GCE High-Voltage RBMS Master Controller
- Complete self-inspection & real-time full-condition monitoring system, compatible with external HMI touch display
- Highly integrated rack-level control architecture with multi-layer safety protection strategies
- Built-in automatic current sharing algorithm for multi-cluster parallel operation
- Highly flexible communication protocol compatibility with most mainstream brand PCS and UPS inverters
- Large-capacity local data storage with high-speed storage chip and SD card slot
- Redundant dual power supply design (AC mains + battery backup)
- Optional external 4.3-inch / 7-inch touchscreen for parameter modification
Technical Parameters of 768V 250A High-Voltage RBMS Master
| Category |
Technical Details |
| Product Type |
High-Voltage Rack Battery Management System (HV RBMS) |
| Model Number |
RBMS07-S20-250A-768V |
| Protection Structure |
Dual-stage protection: MCCB molded case circuit breaker + high-voltage contactor |
| Rated Operating Current |
±250A, short-time peak withstand current up to 500A |
| Adaptable DC Voltage Range |
96V~1000VDC, perfectly matching 240S 768V LFP systems |
| Current Sampling Accuracy |
±1% full scale (1%FSR) |
| External PCS Communication Port |
RS485 / CAN dual options |
| BMU Slave Communication Bus |
CAN bus cascading |
| Multi-rack SBMS Parallel Communication |
Compatible with RS485 / CAN |
| EMS / Upper Monitoring Connection |
Ethernet TCP/IP |
| Firmware Upgrade |
Supports remote IAP online upgrade without chassis disassembly |
| HMI Human-Machine Interface |
External optional accessory for parameter reading & writing |
| Insulation Detection |
Optional add-on module, applicable for systems above 300V |
| DC Cold Start |
Optional high-voltage power module supporting battery-side cold start |
| Dry Contact Output |
Not built-in, expandable upon request |
| Max Supported BMUs per Master |
Up to 20 slave BMU units |
| Auxiliary Power Supply |
24VDC (operating range: 18~28VDC) |
| Overall Power Consumption |
≤20W (≤15W for 2-wire models; ≤25W for 3-wire center tap models) |
| Overall Dimension |
Standard 4U rack mount: W440 × H178 × D600 mm |
| Cable Routing Mode |
Front-in & front-out for convenient cabinet maintenance |
| Center Tap Support |
Optional 3-wire midline function |
| Net Weight |
28kg |
| Ingress Protection Grade |
IP20, specially designed for indoor energy storage cabinets |
| Dielectric Withstand Voltage |
2800VDC withstand test, leakage current <1mA within 1 minute |
| Applicable Scenarios |
PV power station energy storage, off-grid island energy storage, industrial & household ESS, microgrid systems, industrial 220V DC power supply, UPS backup power system |
3-Tier Hierarchical Topology of HV BMS System
The energy storage monitoring system adopts three-level hierarchical control with clear logical layers:
- Bottom Layer: BMU cell monitoring units collecting cell voltage & temperature data
- Middle Layer: RBMS rack master controller managing all cells in a single battery cabinet
- Top Layer: SBMS system central controller uniformly managing up to 15 RBMS rack masters
For small-scale single-rack energy storage projects, the system can be simplified into a 2-layer structure (BMU + RBMS only) without SBMS.
Standard Factory Accessories
- High-voltage power terminal insulating covers: 2 black covers for 2-wire models, 4 black covers for 3-wire center tap models, plus 2 orange covers
- 6-core 2m shielded communication cable ×1, for external connection between RBMS and PCS/SBMS
- Wirable AC mains input socket (250V 10A) ×1 set
- 5.08mm pitch 4Pin dry contact terminal block ×1 set
- 120Ω communication terminal matching resistor ×1, installed at the last cascaded device
- 4-pin terminal block for external display screen wiring ×1 set
Frequently Asked Questions
Q1: Are you a manufacturer or trading company?
A: We are an original manufacturer with standardized production workshops in Changsha Economic & Technological Development Zone. Factory site visits are warmly welcomed.
Q2: Can I order samples for testing?
A: Sample orders are available for lab performance verification and project condition matching before bulk purchase.
Q3: What battery cell chemistries are compatible with this HV BMS?
A: It supports three mainstream energy storage cell types: Lithium Iron Phosphate (LFP), Nickel Manganese Cobalt (NMC), and Lithium Titanate (LTO).
Q4: What is the standard production lead time?
A: Normally 15~20 working days for standard configurations; lead time for customized functional models can be negotiated separately.
Q5: What payment terms do you accept?
A: T/T advance payment is our primary settlement term. Other payment methods such as L/C can be discussed based on order scale.
Q6: What is your product warranty policy?
A: We provide a standard 3-year warranty for the whole set with free hardware repair & replacement for non-man-made damage.
Q7: Can customized functions be developed for specific project demands?
A: Minor custom adjustments to communication protocols, protection thresholds, and external expansion interfaces are available when meeting the minimum order quantity.
Q8: How does your factory implement quality control?
A: Multi-channel inspection procedures cover incoming raw material testing, PCB assembly, full-load aging test, and high-voltage withstand detection.
Q9: What international trade terms can be adopted?
A: EXW for orders below USD 5,000; FOB terms recommended for bulk orders. Small sample shipments via DHL, UPS or FedEx.
Q10: Is the BMS easy to install and commission?
A: This 4th generation integrated high-voltage BMS solution is equipped with complete wiring harnesses and printed wiring marks. General electricians can finish assembly following the operation manual.
Q11: What core benefits can end customers obtain from this HV BMS?
A: The system integrates full closed-loop charge-discharge control logic and active cell balancing algorithms to guarantee long-term stable operation, low failure rate, maximum efficiency, and extended service life.
Safety Rules for Installation & Maintenance
- High-voltage DC circuits are built inside the equipment. Only authorized professional technicians are allowed to disassemble the chassis.
- After secondary high-voltage protection is triggered, wait at least 1 minute before re-closing the breaker.
- Close the DC switch on the PCS side first, then power on the RBMS master to avoid impulse current.
- All maintenance work must use insulated tools.
- Do not modify factory pre-set core parameters arbitrarily.
- In case of fire, only dry powder fire extinguishers or fire sand are permitted.
- Disconnect the main circuit breaker if the system remains idle for a long time.
Operating Environment & Temperature Specifications
- Standard operating ambient temperature range: -20℃ ~ +45℃
- Derated operation required above 45℃
- Applicable ambient humidity: 5%~75%RH, no condensation
- Compliance Standards: GB/T 16935.1, GB/T 17626.2, GB/T 17626.5; CE safety certifications IEC62477-1, EN61000-6-2/4, fully RoHS compliant
Application Scenarios
- Large-scale ground-mounted PV energy storage power stations
- Off-grid island power storage systems
- Industrial & commercial peak-valley price energy storage
- Residential household battery cabinets
- Microgrid frequency & voltage regulation storage systems
- Industrial UPS uninterruptible backup power supply
- 220V DC operating power supply for power substations
