Sungrow SG150CX

Compatibility

Compatible through a qualified Modbus RTU monitoring path

The SG150CX manual Ver17 names RS485_1 as a monitoring connection, and Sungrow protocol V1.1.80 explicitly identifies SG150CX as type 0x2C57 with FC04 running-information registers.

SG150CX international model, manual Ver17 (June 2026) and protocol V1.1.80 (March 2026). Check the installed market suffix and software against these documents. The SG150CX-CN types are distinct; an existing WiNet-S2 or logger may rule out a second RS-485 client. No site-tested configuration is asserted.

Connect it with

• 
  Modbus Interface ZMB-3X
  From €399 ex VAT Configure Modbus Interface
• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

Models

Specifications

The SG150CX manual Ver17 assigns RS485_1 A1/B1 to an external monitoring box or other monitoring device, RS485_2 to an external box or cascade and RS485_3 A3/B3 to the external energy meter. COM1 can host an optional WiNet-S2 Ethernet/WLAN module. The manual prohibits simultaneous use of that communication module and a third-party RS-485 data logger.¹

Exact model

SG150CX, protocol device type 0x2C57^1, 2

AC rating

150 kW rated output; check the installed 380/400/415/480 V regional variant¹

PV inputs

Seven MPPTs, three PV strings per MPPT^1, 2

Monitoring terminals

RS485_1 A1/B1 differential pair; not the COM1 WiNet-S2 Ethernet connection¹

Meter terminals

RS485_3 A3/B3 is assigned to the external meter¹

RTU defaults

9600 bit/s, eight data bits, one stop bit, no parity by default; slave address 1 by default, settable 1–247²

Identity read

FC04 at one-based register 5000, wire address 4999, returns 0x2C57 for SG150CX²

Active-power read

FC04 at registers 5031–5032, wire start 5030; signed 32-bit watts, low word first²

Interface

Documented measurements and integration boundaries for SG150CX.

• Device type 0x2C57 establishes that a register response belongs to the SG150CX, not a CN suffix or another Sungrow model.
• The read-only running-information map covers active power, yield, work state and selected MPPT values; the model has seven MPPTs.
• A plant or grid connection meter, measured independently, is needed to establish export and flexibility delivery. Inverter telemetry is not settlement evidence.

Setup

1. Record the complete nameplate including any market suffix, installed firmware, existing WiNet-S2 or communication box, the meter wiring and the owner of the RS-485 bus.

   The SG150CX-CN variants have different type codes.

2. Agree an exclusive RTU-master design before connecting to RS485_1 A1/B1.

   Keep RS485_3 meter wiring, local stop, alarms and grid protection untouched. Do not attach a parallel third-party logger beside the communication module.

3. Confirm slave address and serial framing on the commissioned system.

   The protocol defaults of 9600 bit/s, 8N1 and slave 1 are starting points, not proof of the installed setting.

4. Use FC04 at wire address 4999 to read one register.

   Require 0x2C57 and a complete CRC-checked response before applying the SG150CX map.

5. Read FC04 at wire start 5030, quantity two.

   Decode low word first as signed 32-bit watts; reject the unavailable sentinel and compare with a contemporaneous local reference.

6. Exclude all active-power limits, grid-code, stop and reactive-power writes from this monitoring guide.

   Check a separate connection-point measurement before any flexibility claim.