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Documentation Index

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This glossary covers the technical vocabulary you will encounter when working with Huawei SUN2000 inverters — from hardware acronyms and log file names to Modbus protocol concepts and software components. Terms are organized alphabetically. Expand any entry to read its definition.
Intelligent protection against DC-side arc faults. The DSP processor analyzes spectral noise in the DC circuit, and a neural network trained on millions of “normal” versus “arc fault” signal samples identifies the onset of an arc in milliseconds. AFCI is built into SUN2000 V3 models as a standard feature and cannot be replicated by conventional mathematical algorithms alone.
The log file that records every alarm event the inverter has generated, including the precise start and end timestamp and the associated error code. This is your primary source for investigating faults, identifying chronic grid issues, and building documentary evidence for grid operator complaints or warranty claims.
A maintenance model in which service actions are triggered by actual measured equipment condition rather than a fixed calendar schedule. CBM contrasts with “fix when broken” reactive maintenance and with routine annual inspections. Continuous analysis of EMAP log data enables the shift to CBM by providing the real-time equipment health signals needed to act at the right moment.
Huawei’s proprietary binary log file format used by SUN2000 inverters. The official expansion of the acronym is not publicly documented by Huawei. EMAP files are stored in the inverter’s internal Flash memory using a circular buffer and transferred to external systems via Modbus FC 0x41. The binary format is significantly more compact than text-based logs, enabling fast writes even during critical fault events.
A battery storage system integrated with the solar inverter. In the Huawei ecosystem, ESS typically refers to a LUNA2000 battery pack connected to a compatible SUN2000 inverter. V3-generation inverters (M3, MB0 series) provide native ESS support with dedicated Modbus registers for SOC, SOH, charge/discharge power, and bus voltage.
A Huawei-proprietary Modbus function code (hexadecimal 0x41) used to transfer log files from the inverter’s internal Flash storage to an external device. It is not part of the standard Modbus specification. FC 0x41 uses a session-based protocol with sub-functions for initiating transfer, requesting data chunks (typically 240 bytes each), and closing the session. CRC checking and frame sequence numbers ensure data integrity across the transfer.
A multiplier used in Modbus communication to transmit fractional values as integers. Because Modbus registers hold only whole numbers, the inverter stores a value such as 231.5 V as the integer 2315 with a documented gain of 10. To recover the real value, divide the register reading by the gain. Common gain values are 10, 100, and 1000. Always confirm the gain for each register against the Modbus Interface Definitions document for your specific model.
The main operational data log, recording inverter measurements at 5-minute intervals. Contents include voltage and current for each MPPT input, heat sink temperature, and insulation resistance (Rin). This is the primary log for identifying underperforming strings, degraded contacts, and gradual efficiency loss over time.
Huawei’s residential and commercial battery storage product, designed to integrate natively with SUN2000 inverters. Available in capacities from 5 kWh (residential S0 series) up to 100 kWh (commercial H1 series). LUNA2000 connects to compatible SUN2000 models via dedicated battery ports and is monitored through dedicated ESS Modbus registers.
An algorithm implemented in the inverter that continuously finds and maintains the operating point at which a solar string produces its maximum power output. Because a PV string’s power curve shifts with irradiance and temperature, MPPT adjusts the inverter’s DC bus voltage in real time. SUN2000 inverters implement an enhanced version of the Perturb & Observe method, with adaptive step size and Smart IV Scanning for conditions with partial shading.
The ongoing technical operation and service maintenance of a solar plant. O&M encompasses scheduled inspections, log analysis, fault response, component replacement, performance benchmarking, and regulatory reporting. Effective O&M relies on systematic access to inverter log data.
The resistance measured between the PV array conductors and protective earth (ground). Rin is a critical safety parameter: a reading below 100 kΩ means the insulation barrier has been compromised, creating a shock and fire hazard. The inverter records Rin in his_inv_rd at each 5-minute interval. A sudden drop in Rin during wet weather indicates moisture ingress; a gradual decline over months suggests progressive cable or junction-box degradation.
Huawei’s Wi-Fi and Ethernet adapter that plugs into the inverter’s communication port. The SDongle enables Modbus TCP connectivity on port 502 (older firmware) or 6607 (newer firmware) and connects the inverter directly to the FusionSolar cloud, eliminating the need for a SmartLogger on smaller installations. One limitation: connecting a third-party Modbus client via RS485 simultaneously with the SDongle can cause instability.
Huawei’s industrial data logger device for large commercial and utility-scale solar plants. The SmartLogger 3000A supports up to 80 inverters and provides centralized log collection, Modbus gateway functionality, local web-based monitoring, and automated IV Curve Scan scheduling. It communicates with inverters over RS485 or Modbus TCP and aggregates their data before forwarding to FusionSolar.
The current charge level of a battery, expressed as a percentage of its total capacity. In the Huawei ecosystem, SOC for a LUNA2000 unit is available in real time via Modbus register 37004 (V3 series, gain 10 — so a register value of 955 equals 95.5%).
The remaining useful capacity of a battery expressed as a percentage of its original rated capacity. A new battery has an SOH of 100%. As the battery ages through charge and discharge cycles, SOH declines. Monitoring SOH over time lets you project when the battery will need replacement before capacity drops to an operationally unacceptable level. The Modbus register address for SOH varies by SUN2000 series — consult the Modbus Interface Definitions for your specific model.