Mesa Model Structure And Nomenclature - Nuvation Energy NUV300-BC-12 Product Manual

Nuvation Energy Low-Voltage BMS - Product Manual
8.1.3.1. 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.
8.1.3.2. 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.
8.1.3.3. S802
This model describes a battery storage device. At this level, the critical operational information
includes the charge and discharge current limits. All mandatory points are implemented. The Modbus
address of this model is 40094.
8.1.3.4. S803
This model describes a lithium-ion battery in detail. Voltage, temperature, and current statistics are
available at the pack and stack level within this model. All mandatory and most optional points are
implemented. The Modbus address of this model is 40116.
8.1.3.5. End Model
This model marks the end of the implemented Modbus address space.

8.1.4. MESA Model Structure and Nomenclature

This section is a clarification of terms used to describe a MESA model. It is used to understand the
terminology in the spreadsheet presented in the previous section.
8.1.4.1. Points
All MESA models are a collection of points (i.e. Modbus registers). These points can be one or more
Modbus registers in length. By definition, each Modbus register is 16 bits wide. For points that are
larger than 16 bits, partial read accesses are not allowed. A Modbus read/write error is returned on
such an access.
8.1.4.2. Fixed/Repeating Blocks
MESA models are described as collections of Fixed and Repeating blocks of points. A Fixed block is a
set of points that is always defined and never changes in its size. A Repeating block describes a set of
related points (i.e. usually for a string of batteries) of which there could be multiple instances of the
Repeating blocks. The points within a repeating block are the same but these sets of blocks are
concatenated sequentially.
Document ID: NE-PM-002 139 Rev 1.2, 2021-03-03
Curie Update 1