Huawei SUN2000-12/15/17/20/25KTL-M5

Commercial PV inverter

Huawei's five M5 ratings span 12 to 25 kW. The manual assigns pins 9/10 to inverter cascading or a SmartLogger, and pins 11/12 to the power meter. Huawei’s model-listed interface definition supplies read-only identity, power and frequency registers and specifies Modbus RTU over RS485. Use the published revision as a best-effort starting map, confirm identity and compare live values. This does not imply an open TCP server on an optional Smart Dongle or a tested Edge installation.

Huawei SUN2000 M5 commercial PV inverter
  • Modbus RTU

Commercial PV inverter

Compatibility

Documented Modbus RTU monitoring

Huawei’s model-listed interface definition supplies read-only identity, power and frequency registers and specifies Modbus RTU over RS485. Use the published revision as a best-effort starting map, confirm identity and compare live values. This does not imply an open TCP server on an optional Smart Dongle or a tested Edge installation.

SUN2000-12/15/17/20/25KTL-M5. Published baseline V200R022C10; record actual firmware and compare identity/values. Read-only RS485 monitoring; preserve commissioned meter, battery, export-limit and protection control. No optional Dongle TCP endpoint is assumed.

Connect it with

An available inverter communications pair is configured for an external Modbus RTU reader; preserve an existing logger/master and the meter/battery bus

  • Wired
  • Edge
  • Platforms
Commercial PV inverter
Interface
Gateway
Edge
Output
SUN2000-12/15/17/20/25KTL-M5SUN2000 inverter communications pair
Protected EthernetSegmented LAN
ZGW-20 GatewayHosts Edge locally
EpiSensor EdgeProtocol client + point model
Customer platformMQTT · API · files
Ethernet
Protected Ethernet
Runs locally
Optional onward data
Huawei's five M5 ratings span 12 to 25 kW. The manual assigns pins 9/10 to inverter cascading or a SmartLogger, and pins 11/12 to the power meter. Use the inverter communications pair identified in the installation manual, not the meter/battery pair. Keep one master on each RS485 bus. The interface definition supplies the read map; an optional Smart Dongle network uplink is a separate path. The customer-platform output is optional; Edge remains the local system of record.

Models

Download
ModelsInterfaceRoute into Edge
SUN2000-12KTL-M512 kW rated AC output; two MPPTs; the M5 manual's logger and meter RS485 pairsQualify the installed regional and firmware version before seeking a read-only northbound data source.
SUN2000-15/17/20/25KTL-M515, 17, 20 or 25 kW rated AC output; shared M5 signal-terminal rolesThe family wiring diagram does not prove identical third-party points, permissions or limits across deployed versions.
SUN2000-ZHM5 and SUN2000-MB0Separate variant or generation, excluded from this guideThe shared manual includes ZHM5 chapters; do not apply their electrical specifications to M5 or transfer an MB0 interface.

Specifications

Huawei's November 2024 M5 datasheet lists five three-phase AC ratings from 12 to 25 kW, two MPP trackers and four PV string inputs. It names RS485 and optional WLAN/Ethernet or mobile Smart Dongles. The model-listed Huawei interface definition supplies the read-only starting map below.13

M5 models
SUN2000-12, 15, 17, 20 and 25KTL-M512
Rated AC power
12, 15, 17, 20 or 25 kW respectively1
PV inputs
Two MPP trackers and up to four string inputs1
Logger/cascade pair
Signal pins 9/10: 485A1/485B12
Power-meter pair
Signal pins 11/12: 485A2/485B22
Optional communications
Huawei WLAN-FE or 4G Smart Dongle; external client access requires its own documentation12
Enclosure
IP66; verify site-specific installation and derating1

Interface

Documented measurements and integration boundaries for SUN2000-12/15/17/20/25KTL-M5.

  • Pins 9/10 (485A1/485B1) are for inverter cascading or a SmartLogger RS485 signal port. Preserve the existing bus owner when planning third-party observation.
  • Pins 11/12 (485A2/485B2) connect to the power meter. They are not a spare generic inverter telemetry pair.
  • Huawei lists a WLAN-FE Dongle (SDongleA-05) and 4G Dongles (SDongleA-03 or SDongleB-06) as accessories. A Dongle's Ethernet or mobile uplink is not evidence of a native inverter Modbus TCP server.
  • The manual recommends specific Huawei-compatible meters and notes firmware boundaries for some. Grid import and export require the commissioned point-of-connection meter, its sign convention and freshness, not just inverter output.
  • The five dry-contact inputs include grid-scheduling functions and a rapid-shutdown signal. No third-party write, export-limit or VPP dispatch path is established by this selection guide.

Assessment

SUN2000-12/15/17/20/25KTL-M5. Published baseline V200R022C10; record actual firmware and compare identity/values. Read-only RS485 monitoring; preserve commissioned meter, battery, export-limit and protection control. No optional Dongle TCP endpoint is assumed.

InteroperabilitySupported with conditions
Huawei lists this model family and Modbus RTU read registers; available bus role and optional network accessories remain site-specific.23
AccuracyNot yet assessed
OEM identity, signed power, frequency, types and gains are documented. Installed measurement accuracy and physical polling behavior have not been measured.123
SecurityNot yet assessed
A read-only account and network-permission model for the actual logger or Dongle are not documented here.2
ReliabilityNot yet assessed
The public Modbus definition establishes response format; installed polling capacity, stale-data handling and recovery have not been measured.23
RuggednessSupported with conditions
The datasheet lists IP66 and an outdoor temperature range; the installed mounting, cable sealing and derating still require site review.1
ScalabilityNot yet assessed
Cascade wiring is documented, but third-party address capacity and polling load are not established.2
LifecycleSupported with conditions
Huawei publishes a current exact-family manual and M5 datasheet. Version and accessory compatibility must still match each installation.12

Setup

Identify the inverter and read active power

A best-effort read-only start from the model-listed Huawei interface definition. Use the configured inverter address and serial framing on an available, installer-approved RS485 link. Keep the meter/battery bus and existing plant master separate. Addresses below are literal Modbus PDU addresses.

Read identity
FC03 model name at 30000, 15 registers: PDU 03 75 30 00 0F. Serial number at 30015, 10 registers: 03 75 3F 00 0A. Model ID at 30070, one U16: 03 75 76 00 01. Compare the returned name and serial with the nameplate; use the model-ID table for this family, not an ID from another SUN2000 generation.
Signed active power
FC03 address 32080, quantity 2: PDU 03 7D 50 00 02. Active power is signed I32 with gain 1000, unit kW. Join the most-significant word first and divide by 1000. Synthetic 00 00 13 88 gives 5000 ÷1000 = 5.000 kW; FF FF EC 78 gives -5.000 kW. These are decoder fixtures, not measurements. Do not treat the pair as Float32 or divide twice when displaying W.
Frequency and comparison
FC03 address 32085, quantity 1: PDU 03 7D 55 00 01. Frequency is U16, gain 100, in Hz. Synthetic 13 88 gives 5000 ÷100 = 50.00 Hz. Compare fresh active power and frequency with Huawei’s local view. Keep inverter production distinct from the site meter’s signed import/export and storage measurements.
Addressing and response quality
Use the configured slave address and standard RTU CRC16; the PDUs above omit that envelope. Keep exceptions, incomplete responses and timeouts unavailable rather than zero. If identity fails, check slave address, serial framing and A/B polarity first. Do not copy a SunSpec unavailable-value sentinel into this Huawei map. Begin with a small read-only point set and preserve the existing bus master.

Acceptance: The published map provides a concrete monitoring start; verify identity and values on the installed equipment. Physical Edge operation remains untested. Battery, export-limit, grid and protection writes stay with the commissioned plant owner.

  1. Confirm the M5 and plant topology

    Record the complete nameplate, country configuration and firmware. Identify every cascaded inverter, SmartLogger, Smart Dongle and grid-point meter. Keep ZHM5 and MB0 outside this M5 guide.

  2. Trace both signal pairs

    Use the applicable Issue 17 wiring diagram to identify pins 9/10 for the SmartLogger or cascade and pins 11/12 for the meter. Do not disturb an occupied or protection-related circuit.

  3. Identify the inverter and read active power

    FC03 model name at 30000, 15 registers: PDU 03 75 30 00 0F. Serial number at 30015, 10 registers: 03 75 3F 00 0A. Model ID at 30070, one U16: 03 75 76 00 01. Compare the returned name and serial with the nameplate; use the model-ID table for this family, not an ID from another SUN2000 generation.

  4. Prove one value against Huawei's view

    With installer authorisation and the matching point document, compare a live inverter power value and timestamp against the commissioned Huawei view. Reject stale data before adding further measurements.

  5. Measure flexibility at the right boundary

    For import, export or flexibility reporting, document the grid-point meter and direction convention separately. Do not infer site demand or dispatch availability from inverter power alone.

Sources

  1. SUN2000-12/15/17/20/25KTL-M5 technical specification, version 01-202411 (opens in a new tab) (PDF) Huawei
  2. SUN2000-(12K-25K)-M5 Series User Manual, Issue 17, 30 March 2026 (opens in a new tab) Huawei
  3. Huawei SUN2000MB Modbus Interface Definitions, Issue 02, 1 February 2024 (public mirror) (opens in a new tab) (PDF) Huawei

Further reading

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