GRNbms MK3 High Voltage Battery Management System (HVBMS)

GRNbms MK3 – High Voltage Battery Management System 

Reliable Safety. Intelligent Control. Powered by GRN-OS.

The GRNbms MK3 is a state-of-the-art Battery Management System for high-voltage energy storage systems ranging from 190 V to 1500 V DC. It combines intelligent system control, high-voltage safety features, and wide communication support – making it ideal for professional energy storage, off-grid applications, and second-life battery use.

The system is powered by GRN-OS, our robust and secure Linux-based operating system, designed for high reliability and updateability. For the best and safest performance, the MK3 is used in combination with our GRNcmu modules, supporting full-stack control, balancing, and diagnostics.

🔋 Key Features

• Supports 190–1500 V DC high-voltage battery systems

• Integrated control for Precharge, Battery+, and Battery− relays

• Three independent CAN buses (up to 1 Mbit/s)

• Multiple auxiliary outputs: 3× 12 V and 1× 5 V (current-monitored & short-circuit protected)

• Advanced isolation monitoring: HV+, HV− and battery enclosure/case sensing

• Up to 5 external temp/humidity sensor ports

• PWM fan output with RPM monitoring

• RJ45 CAN port for simple inverter integration (e.g. DEYE)

• Ethernet (LAN) for remote access, Modbus TCP, and BMS Master/Slave communication

• RS485 for Modbus (e.g. inverters, smart meters), 2× USB, RS232

• Nextion-compatible display interface

• Supports up to 2160 cells

• Supports third-party CMUs (e.g. VAG MEB)

• CE-certified for safety and EMC compliance in European markets

• 🌐 GRNlive – Cloud Monitoring & Remote Access for GRNbms

  With GRNlive, we offer a professional cloud-based platform for real-time monitoring and remote access to your GRNbms system — perfect for managing your energy system on the go, performing data analysis, or granting team access. Seamlessly integrated with your BMS, GRNlive provides live dashboards, historical insights, and secure device control.

  🔗 Learn more or get started at:
  grnbms.de/start

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  🚀 Key Features of GRNlive

  • Live Dashboard:
    View cell voltages, pack voltage, temperatures, relay states, and more — all in real time.

  • Data Logging & Analytics:
    Access historical charts and performance trends over days, weeks, or months.

  • Device & User Management:
    Control multiple systems, manage users, and assign access permissions — all remotely.

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  ✅ Why GRNlive is the Perfect Companion

  • Remote Monitoring Anywhere:
    Stay informed from your phone, tablet, or PC — at home or in the field.

  • Complete System Insight:
    Track every detail from cell voltages to relay switching status.

  • Team Collaboration:
    Securely share system access with installers, engineers, or co-owners.

  • Fully Integrated with GRN-OS:
    Works natively with all GRNbms platforms — no third-party hardware required.

⚙️ Technical Specifications