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Nuvation Energy Multi-Stack Controller - Product Manual
7. Communication Protocols
7.1. Modbus Protocol Support
Nuvation Energy BMS implements the SunSpec battery models defined in the Modular Energy Storage
Architecture (MESA) as the top-level Modbus interface to the product. Specifically the BMS
implements the MESA Draft 3 Storage models (800 Series).
The specifications for these models are available for download at
https://www.nuvationenergy.com/
technical-resources.
MESA Draft 3 is currently implemented on Nuvation Energy BMS.
7.1.1. Modbus TCP
This protocol is used for communications over TCP/IP networks. A single Modbus TCP connection is
supported over port 502 for read and write access. All register data is transmitted as big endian
(most significant byte first).
Additionally, the Multi-Stack Controller supports as many as 16 read-only Modbus TCP connections on
port 11503.
7.1.2. Implemented MESA Models
The MESA standards contain a number of 'models' that can be implemented by vendors to describe a
storage device at various levels of detail. The models implemented by Nuvation Energy BMS are
described in the sections below.
Detailed register maps for all Draft 3 models are found in the document MESA-Energy-Storage-
Information-Models_Draft_3.xlsx found at the Nuvation Energy technical resources located at
https://www.nuvationenergy.com/technical-resources.
7.1.2.1. Common Model
This model primarily contains information to identify the device (e.g. manufacturer, model, serial
number) as well as the version of software running on the device. A full description of the Common
Model can be found in the SunSpec specification bundle.
7.1.2.2. S801
This model describes an energy storage device at the highest possible level. State-of-Charge and
overall alarm and warning states are found here. All mandatory points are implemented. The Modbus
address of this model is 40070.
7.1.2.3. S802
This model describes a battery storage device. At this level, the critical operational information
Document ID: NE-PM-004
52
Rev 2.0, 2022-05-18
Curie Update 3
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