A Utility-Grade Multi-Stack Battery Management Solution

Grid Battery ControllerThe Grid Battery Controller (GBC) aggregates all the battery stacks in your low- or high-voltage energy storage system and manages them as a single battery. Features include automated system bring-up, connecting and disconnecting individual stacks, reporting system faults and warnings, providing battery data to energy management and environmental control systems, making BMS configuration updates and more.

Users can remotely access the GBC to perform system changes or to observe battery performance at the ESS, stack, and cell level. Securely log into your energy storage system from anywhere to view aggregate or granular voltage, current, temperature and State of Charge (SOC) data in real time.

It also includes internal memory that logs battery performance data locally. Use this data to support warranty claims by comparing actual vs predicted battery degradation curves based on time and throughput, understand how different energy storage applications impact battery life, or to track down the cause and location of a performance issue. (User Manuals and Technical Resources)

Designed in compliance with Draft 3 of the MESA (Modular Energy Storage Architecture) Open Standard for Energy Storage, the Grid Battery Controller was created specifically for integration with a wide range of low- and high-voltage energy storage systems and inverters. Features include:


  • Manages all other Nuvation Energy battery management modules in the ESS, pushes out BMS configuration changes, and aggregates Stack Controllers for ESS-level management.
  • Aggregates voltages, currents, and SOC data across all cells, modules, and stacks and exposes them to the PCS (or stack-level inverters) for multi-stack charge / discharge control.
  • Ensures that all measurements, control signals, and other data are propagating properly through the entire system. Detects and reports sensor connection and BMS module wiring errors prevents a stack from connecting until they are resolved.


  • Intuitive graphical user interface provides an at-a-glance view of system performance at the ESS and stack levels, as well voltage and temperature sensor data of every cell in the ESS.
  • Multi-socket Ethernet interface allows concurrent operation of local and remote maintenance operations, data analytics streaming, and inverter control.
  • Remotely take down a specific battery stack during ESS operation, make BMS configuration changes or perform maintenance tasks such as replacing a battery module or other component, and bring the stack back online.
  • Can send fault and warning messages in real time directly to operations personnel via cellular modem or Ethernet / Internet connection.

GBC User Operator Interfaces


  • Provides a single entry point to all measurement and control points in the BMS. Dedicated controller and read-only ports ensure hardware separation between safety-critical control systems and read-only consumers of battery data.
  • Provides data to multiple consumers of information via the MESA communications protocol over Modbus TCP. Communicates with up to 16 external devices at the same time, e.g. HVAC, fire suppression, energy management system, power conversion system (PCS /inverter), PLC, SCADA, etc.
  • Plug and Play style connectivity with select smart inverters eliminates the need for an external PLC or other control interface between the BMS and PCS (populates current limits and other control signals directly to the supported inverter).
  • Helps prevent overcharging, off-gassing, and over-discharging of individual cells by providing cell SOC and temperature data to the PCS. This data enables the PCS to scale back current on a per-stack basis as individual cells reach maximum rated charge, discharge, or temperature levels.


  • Local data logging of fault conditions as well as measurements of cell voltage, temperature, current, impedance per cell, and sense-wire conductivity per cell, in all stacks for the entire ESS.
  • Acts as a battery analytics gateway from which data can be uploaded or streamed in real time to the cloud for perpetual data logging.


  • GBC Container InstalledConnect for Charging – Connects stacks with lowest SOC first. As charging stacks reach the SOC of disconnected stacks with a similar SOC, brings those stacks online and continues charging until reaching the SOC level of the next stack, connects that stack, and so on until all stacks are connected.
  • Connect for Discharging – Connects stacks with the highest SOC first and begins discharging the ESS. As discharging stacks reach the SOC of the stack with the next highest SOC, connects that stack, and so on until all stacks are connected and discharging.
  • Connect for Capacity – Connects all stacks that have a similar SOC, making immediately available the most energy the ESS is capable of providing. As the ESS is being used, the SOC of the connected stacks will converge with those of disconnected stacks that have a matching SOC, and the GBC will connect those stacks.
  • Stack Connect / Disconnect Reporting – Detects if a stack comes online or goes offline during operation and communicates the capacity change to the PCS. This important feature ensures that your energy control system always has the correct information regarding available capacity and power in the ESS.

Grid Battery Controller Standards & Conformance


  • FCC CFR 47 Part 15 Subpart B : 2016 - Unintentional Radiators, Class A
  • IC ICES 003, Issue 6 : 2016 - Information Technology Equipment (Including Digital Apparatus) - Limits and Methods of Measurement, Class A
  • CISPR 32 : 2015 / EN 55032 : 2015 - Electromagnetic compatibility of multimedia equipment - Emission requirements


  • CISPR 24 : 2010 / EN 55024 : 2010 Information technology equipment - Immunity characteristics - Limits and methods of measurement
    • EN 61000-4-2 - Electro-static Discharge
    • EN 61000-4-3 - Radiated Field Immunity
    • EN 61000-4-4 - Electrical Fast Transients (Bursts)
    • EN 61000-4-5 - Surge
    • EN 61000-4-6 - Conducted RF Immunity
    • EN 61000-4-8 - Power Frequency Magnetic Field
    • EN 61000-4-11 - Voltage Dips and Interrupts


  • CE - compliant with European Union (EU) health, safety and environmental protection directives and regulations.

Validated by DNV GL

"DNV GL has validated the performance of Nuvation Energy High-Voltage BMS and believes it has demonstrated the level of safety required for operation in stationary applications. Further, Nuvation Energy's engineering team have demonstrated an advanced understanding of energy storage technologies and controls and have developed a highly configurable, technology agnostic system capable of rapid field configuration and which demonstrates many of the advanced features DNV GL believes are required for proper active safety from the BMS. Nuvation Energy's design, which incorporates General Purpose Inputs/Outputs (GPIO) allows for integration with the balance of system, including fire detection and alarm systems and other sensors that many systems do not possess."

– Nick Warner, Senior Test Engineer, Energy Advisory Laboratory Services, DNV GL

MESA Open Standards for Energy Storage

MesaLogo-250x101.jpg Nuvation Energy battery management systems are conformant with the MESA-Device/SunSpec Energy Storage Model. This Model addresses how energy storage components are packaged and arranged, electrically connected and able to communicate with each other and other operational components. MESA conformance enables the BMS to be integrated with any other MESA-conformant energy storage hardware or software without the custom middleware often required to enable different companies’ products to work together. MESA-Device Specifications are built on the Modbus protocol.