MESA-Device Specifications

The MESA-Device Specifications, developed jointly with SunSpec, is comprised of three documents covering the communications with the three major components of an energy storage system (Power Conversion Systems (Inverters/Converters),  Battery Storage, and Meters).

MESA-Device/SunSpec Energy Storage Model builds on SunSpec’s model-based framework. To acquaint yourself with the architectural concepts, start your reading with SunSpec Technology Overview and SunSpec Information Model Reference.   SunSpec’s Inverter, Battery Storage, and Meter model specifications are available for download with a free account at SunSpec.


This specification builds on the SunSpec model-based framework, but it defines new models that address the capabilities and requirements of energy storage devices. The document outlines the approach and the initial models, and the spreadsheet provides the details of each model. An archived version of the previous draft is included below.

The Energy Storage Workgroup was run by SunSpec Alliance with contributions from MESA members. The Workgroup collaborated through 2015 and 2016 to produce an updated draft specification for MESA-Device/SunSpec Energy Storage Specification (Draft 4). The specification was released in DRAFT status for feedback and testing in July 2016.



This documentation, based substantially off of the SunSpec Inverter model specifications, outlines a vendor-specific model extension to SunSpec’s work that provides a standard way for a PCS to support key energy storage scenarios. The document describes the SunSpec models adopted by MESA and the rationale for the needed extensions and overviews the Modbus registers that are prescribed in the specification. The spreadsheet then contains the details of the registers and expected values.

MESA-Power Meter

For power meters, MESA has adopted SunSpec’s Meter Models v1.2 or later available at the link listed below. Therefore any power meter that is SunSpec compliant and implements a Modbus/TCP interface is deemed to be MESA-Device compatible.


Thank you for your interest in MESA-Device. To ask questions or comment on the work, please email [email protected].

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