Deye High Voltage Battery Cluster Control Box (BMU) for BOS-G
The Deye High Voltage Battery Cluster Control Box — often referred to as the BMU (Battery Management Unit) — is a critical system control component engineered for managing BOS-G high-voltage battery clusters. It acts as the central monitoring and safety interface between multiple high-voltage battery modules and the rest of the energy storage system.
This unit is not a battery, inverter, or power converter. Instead, it provides intelligent control, safety supervision, and real-time performance management for clusters of high-voltage battery modules in both residential and commercial solar energy storage systems.
Role and Function in High-Voltage Battery Clusters
In high-voltage lithium battery systems, battery modules are connected in series and parallel to achieve the desired voltage and energy capacity. The BMU serves as the core control platform that monitors and manages the overall behaviour and health of these connected battery modules, ensuring stable operation and system safety.
The BMU continuously monitors battery voltages, current flow, temperatures, and overall system status. Based on this data, it coordinates protection logic, balances module behaviour where required, and manages charging and discharging activity across the entire battery cluster to prevent unsafe operating conditions.
High-Voltage Compatibility and System Integration
This control box supports a wide high-voltage operating range, making it suitable for systems built from multiple BOS-G battery modules. It interfaces directly with high-voltage battery strings and communicates system status to compatible inverters, power conversion systems (PCS), and energy management platforms.
Communication interfaces such as CAN2.0 and RS485 allow the BMU to transmit real-time battery data, alarms, and operating limits, enabling coordinated system control and safe interaction between batteries and the inverter or PCS.
Advanced Safety and Protection Capabilities
The BMU incorporates multiple layers of electrical and thermal protection to safeguard the battery cluster and connected equipment. These protection mechanisms include:
- Over-voltage and under-voltage protection
- Over-current and peak current protection
- Over-temperature monitoring and protection
- Short-circuit protection
- System fault detection and isolation
These safety functions are essential in high-voltage systems, where incorrect operation or unmanaged faults can result in equipment damage or unsafe conditions.
Applications and Use Cases
The Deye BMU Cluster Control Box is designed for use in:
- High-voltage residential hybrid energy storage systems
- Commercial solar and backup power installations
- Industrial energy storage and power continuity systems
- Off-grid and grid-interactive systems using BOS-G battery clusters
It is specifically intended for installations where multiple high-voltage battery modules are connected in series and/or parallel and must be managed as a coordinated battery cluster.
This control box is specific to Deye BOS-G high-voltage battery clusters and must be installed by qualified professionals experienced with high-voltage lithium battery systems.
Technical Specifications – Deye High Voltage BMU Cluster Control Box
General
- Product type: High-voltage battery cluster control box (BMU)
- Compatible system: Deye BOS-G high-voltage battery clusters
- Model variants: HVB750V/100A-EU, HVB750V/100A-US
Electrical Input / Output
- Operating voltage range: 120 V DC – 750 V DC
- Nominal charge / discharge current: 100 A
- Maximum charge / discharge current: 125 A
- DC input supply: 12 V ±2% / 4.15 A
Communication Interfaces
Protection and Safety
- Over-voltage protection
- Under-voltage protection
- Over-current protection
- Over-temperature protection
- Short-circuit protection
Environmental
- Operating temperature range: -20°C to +65°C
- Ingress protection rating: IP20
Physical
- Dimensions: 440 × 570 × 150 mm
- Weight: Approx. 15.5 kg (EU version) / Approx. 17 kg (US version)
FAQ
Frequently Asked Questions About the Deye High Voltage BMU Control Box
What is the Deye BMU (Battery Management Unit)?
It is an intelligent control and monitoring unit designed to manage high-voltage battery clusters, ensuring safe operation, balanced performance, and protection of BOS-G battery modules.
Does the BMU replace the battery modules?
No. The BMU is a control box that works *with* high-voltage battery modules; it does not store energy itself.
What voltage range does the BMU support?
It supports high-voltage battery clusters from 120 V DC up to 750 V DC, making it suitable for large multi-module configurations. :contentReference[oaicite:5]{index=5}
Can the BMU work with non-Deye batteries?
This BMU is designed for integration with Deye BOS-G high-voltage battery clusters. Compatibility with other brands should be confirmed with the supplier.
What protections does the BMU provide?
It includes protection against over-voltage, under-voltage, over-current, over-temperature, short circuits, and abnormal battery conditions to safeguard the battery system.
Does the BMU communicate with the inverter?
Yes. The BMU uses CAN2.0 and RS485 communication to interface with compatible inverters and system monitoring platforms.
Can the BMU be installed outdoors?
No. The IP20 rating means it is designed for indoor installation in a controlled environment such as a battery room or cabinet.
Who is qualified to install this BMU?
Installation should be performed by a qualified electrical professional experienced with high-voltage battery systems and inverter integration.
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