DALY BMS Clarifies Data Transmission From Multiple Battery Management Systems to Inverters

DALY BMS has published a technical explanation addressing how systems composed of multiple battery management systems (BMS) transmit data to inverters. The company highlights that data monitored by each BMS unit in parallel battery packs, such as state of charge (SOC), voltage, and current, does not automatically constitute unified system-level data for the inverter.

The document outlines a typical data transmission path: individual BMS units collect data, identify themselves, communicate internally, and finally relay system-level information to the inverter via CAN or RS485 protocols. DALY stresses that before commissioning, it is crucial to define how system-level values, like overall SOC or current, are calculated and reported, rather than assuming simple averaging or automatic conversion.

DALY's 4th generation systems support up to 16 parallel battery packs and offer automatic BMS addressing along with internal RS485 communication. The system enables monitoring of individual battery pack status and communication with the inverter. The company lists supported inverter ecosystems including Pylontech, Growatt, and Deye, but reminds users that final compatibility must always be verified based on the exact inverter model and required protocol.

Prior to designing the BMS configuration, it is essential to analyze the inverter's requirements. This includes precisely defining the necessary data, such as SOC, voltage, current, and alarms, as well as the communication protocol to be used. DALY BMS provides tools to construct this data path and monitor individual batteries, but ensuring system-level data handling requires project-specific technical verification.