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5.3.4.4. Communication Protocols
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
technical-resources.
MESA Draft 3 is currently implemented on Nuvation Energy BMS.
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).
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.
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. The Modbus address of this model
is 40000.
Table 10
describes the points of the Common Model as implemented in the BMS. A full
description of the Common Model can be found in the SunSpec specification bundle.
Point Name
SunSpec_ID
ID
L
Mn
Md
Opt
Document ID: NE-DS-011
Nuvation Energy G5 High-Voltage BMS - NUVG5 Product Manual
Table 10. Common Model Points
Address Description
40000
Identifies this as a
SunSpec Modbus Map
40002
Identifies Common Model
Block
40003
Length of block
40004
Device Manufacturer
40020
Device Model Number
40036
Options
https://www.nuvationenergy.com/
Note
Set to 0x53756e53
Set to 0x0001
Set to 66
Set to "Nuvation Engineering"
Contents of BMS registers
sc_mfg_info.manufacturing<0-3>`
Set to "Fully Loaded"
63
Rev 1.0, 2023-05-19
G5 Faraday
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