Sungrow SG110CX

Commercial PV inverter

The original SG110CX has nine MPPTs and two strings per MPPT. It is distinct from the later CX-P2 and CX-P3 platforms even though their names share the same power class. The current communication protocol still identifies the original model explicitly as type 0x2C06. That type check provides a useful commissioning boundary before adopting a measurement map.

Sungrow SG110CX string inverter
  • Modbus RTU

Commercial PV inverter

Compatibility

Compatible through Modbus RTU

Sungrow publishes a current PV inverter map with the exact original SG110CX type code, read function and data formats. The installation manual defines the serial monitoring interface.

Original SG110CX, using its official user manual revision 18 (June 2021) and Residential & Commercial PV protocol V1.1.80 (27 March 2026). Appendix 1 explicitly identifies SG110CX as 0x2C06. SG110CX-20, NI, P2 and P3 are separate variants. The retained protocol establishes no minimum firmware for this exact read; verify the installed software and device type before commissioning.

Connect it with

An approved exclusive-master serial path is available

  • Modbus
  • Edge
  • Platforms
Commercial PV inverter
Interface
Gateway
Edge
Output
SG110CXSG110CX RS485_1
Isolated serial interfaceApproved RS-485-to-host adapter
ZGW-20 GatewayHosts Edge locally
EpiSensor EdgeEdge Modbus RTU client
Customer platformMQTT · API · files
Modbus RTU · RS-485
Isolated serial
Runs locally
Optional onward data
Preserve the existing logger and plant-control architecture. Do not attach a second RTU master to an occupied bus; a logger export requires its own documented route. The customer-platform output is optional; Edge remains the local system of record.

Models

Download
ModelsInterfaceRoute into Edge
Original SG110CXNine MPPTs, type 0x2C06Use RS485_1 and the original-model protocol applicability.
SG110CX-20 / NI / P2 / P3Different variant or generationUse their exact manual and type code; no automatic inheritance.

Specifications

The installation manual assigns RS485_1 to the logger and monitoring connection. Its terminal block and RJ45 connectors are two wiring forms of that serial interface, not independent clients or an Ethernet socket. A site with an existing logger already has an RTU master: agree an approved upstream monitoring path or a planned bus-ownership change instead of attaching a second master. Optional Ethernet equipment requires its own documented setup and is outside this guide.1

Exact hardware
Original SG110CX; protocol device type 0x2C0612
AC output envelope
110 kVA at 45 °C or 100 kVA at 50 °C; nominal three-phase 230/400 V1
PV configuration
Nine MPPTs with two strings per MPPT; not the P2 or P3 generation2
Monitoring bus
RS485_1: A1 signal positive, B1 signal negative, PE shield point1
RJ45 distinction
RS485_1 RJ45 pin 3 is B and pin 6 is A; this connector is not Ethernet1
Serial defaults
9600 bit/s, 8 data bits, no parity, 1 stop bit; address 1 by default, settable 1–247. Verify installed values.2
Power read
FC04, documented registers 5031–5032; wire address 5030, signed 32-bit watts2
Word order
For 32-bit values: low 16-bit word first, big-endian bytes within each word2
Environment
IP66; -30 to +60 °C, derating above +50 °C; altitude up to 4000 m with derating above 3000 m1

Interface

Documented measurements and integration boundaries for SG110CX.

  • Individual inverter active and reactive power from the applicable running-information map.
  • Phase measurements, frequency and energy counters with documented types and scales.
  • Device type, serial identity and software fields for the commissioning record.

Assessment

Original SG110CX, using its official user manual revision 18 (June 2021) and Residential & Commercial PV protocol V1.1.80 (27 March 2026). Appendix 1 explicitly identifies SG110CX as 0x2C06. SG110CX-20, NI, P2 and P3 are separate variants. The retained protocol establishes no minimum firmware for this exact read; verify the installed software and device type before commissioning.

InteroperabilitySupported with conditions
The exact model documentation establishes the local interface and identity checks. The installed configuration and existing site controller must be preserved.12
AccuracySupported with conditions
The measurement representation and units are documented, but inverter telemetry does not establish revenue-meter accuracy.2
SecurityNot yet assessed
The proposed local monitoring path does not establish authenticated or encrypted measurements. Restrict access to the approved site network.1
ReliabilityNot yet assessed
No measured availability or guaranteed historical backfill is established for this direct monitoring connection.2
RuggednessSupported with conditions
The exact manual specifies the enclosure rating and temperature limits, with option or derating conditions that must be retained.1
ScalabilitySupported with conditions
Serial daisy chains require unique addresses, correct termination and a single master; the existing logger limits the available monitoring topology.1
LifecycleNot yet assessed
Versioned documentation is available, but a guaranteed support term or replacement lifetime is not established by the retained sources.12

Setup

Identify the original CX and decode active power

These are synthetic request and data examples, not captured inverter responses. Use the actual configured RTU address and a complete CRC-checked frame.

Identity PDU
04 13 87 00 01 reads FC04 at wire address 4999, quantity 1. Data 2C 06 identifies original SG110CX.
Power PDU
04 13 A6 00 02 reads wire address 5030, quantity 2, corresponding to documented 5031–5032.
Synthetic data
AD B0 00 01 means low word 0xADB0, high word 0x0001. Combined 0x0001ADB0 is signed 110000 W.
Unavailable
FF FF 7F FF combines to 0x7FFFFFFF, the signed unavailable sentinel. Do not report it as generated power.
Frame boundary
The PDU omits the configured slave address and CRC16. Validate those plus the response function and byte count before accepting data.

Acceptance: Accept only after exact device type, framing, decoded units and live reference agree. A successful measurement does not authorise dispatch, grid-setting or protection writes.

  1. Check the original model and software

    Original SG110CX, using its official user manual revision 18 (June 2021) and Residential & Commercial PV protocol V1.1.80 (27 March 2026). Appendix 1 explicitly identifies SG110CX as 0x2C06. SG110CX-20, NI, P2 and P3 are separate variants. The retained protocol establishes no minimum firmware for this exact read; verify the installed software and device type before commissioning.

  2. Agree serial-bus ownership

    Identify the existing logger and plant controller before wiring. Do not add a second RTU master to its bus or disconnect operational control to obtain a reading. Use an approved logger export or an engineered exclusive-master arrangement; this guide does not establish that upstream export automatically.

  3. Use the documented monitoring interface

    Use RS485_1 A1/B1 and the shield point as specified by the manufacturer. Its RJ45 option carries RS-485 on pins 3 and 6, not Ethernet. Keep other serial, tracker, alarm and local-stop connections unchanged. Follow the site’s qualified installation and termination design.

  4. Verify serial settings

    Read the configured address and framing. The protocol defaults are 9600 bit/s, 8N1 and address 1; do not assume an installed unit still uses them. Use one unique address per inverter and validate RTU CRC16 on every complete response.

  5. Read identity with the correct function

    Read FC04 at documented register 5000 using wire address 4999, quantity 1. Require type 0x2C06 for this guide. The same numeric addresses in read/write tables are not substitutes: do not use FC03 for this running-information read.

  6. Decode a bounded active-power read

    Read FC04 at wire address 5030, quantity 2. Combine the first register as the low word and the second as the high word, then interpret the result as signed 32-bit watts. The signed unavailable sentinel is 0x7FFFFFFF, not the SunSpec 0x80000000 convention. Compare with the inverter and a suitable live reference before expanding the point list.

Common questions

Can I connect beside the existing logger?
Not as a second RTU master on the same bus. Coordinate an authorised upstream path or a planned exclusive-master design with the system owner. Two physical connector forms do not create two independent serial buses.1
Does 5031 go directly into the Modbus request?
No. Sungrow’s table uses one-based register numbers and explicitly requires subtracting one. The active-power pair 5031–5032 therefore begins at wire address 5030.2
Can I reuse the hybrid SH10RT map?
No. This is the PV grid-connected inverter protocol and an exact SG110CX type check. Hybrid products and newer CX generations have separate applicability and operating boundaries.2

Sources

  1. SG110CX user manual, revision 18, June 2021 (opens in a new tab) (PDF) Sungrow
  2. Residential & Commercial PV Grid-Connected Inverter protocol V1.1.80, March 2026 (opens in a new tab) (PDF) Sungrow

Further reading

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