The Solis S1-W4G-ST is a professional monitoring data logger designed for Solis inverters equipped with a 4-pin communication port. It enables stable remote monitoring through WiFi and 4G connectivity, giving installers and end users convenient access to inverter and plant data via the SolisCloud platform. The logger supports local Bluetooth commissioning, fast configuration through APP or web, and communication with up to 10 inverters in one RS485 chain, making it a practical and flexible monitoring solution for residential and commercial Solis installations.

This version is supplied without SIM card, which makes it suitable for users who prefer to install their own local SIM for mobile communication. According to the Solis manual, the logger gives priority to WiFi by default, and automatically switches to 4G communication when WiFi is unavailable or weak. Once WiFi is restored, the device switches back automatically.

Key features

• Dual communication via WiFi and 4G

• 4-pin plug-in connection for compatible Solis inverters

• Remote monitoring through SolisCloud

• Supports up to 10 inverters via RS485 daisy-chain connection

• Bluetooth nearby connection for local setup and debugging

• Configuration via mobile app or web interface

• 3 LED indicators for power, inverter communication, and network status

• Reset button for immediate data upload and network reset

• Compact twist-lock installation design

• IP65 protection for dependable indoor and outdoor use

Compatible Solis inverter models
The S1-W4G-ST 4-pin version is intended for Solis inverters that use the 4-pin logger interface. Solis currently lists compatible 4-pin model families including S6-GR1P(0.7-3.6)K-M, S6-GR1P(2.5-6)K, GR1P8K2, S5-GR3P(5-20)K, S5-GC(25-40)K, S5-GC(50-60)K, Solis-(80-110)K-5G-PRO, S5-EH1P(3-6)K-L, S5-EA1P3K-L, and RHI-3P(5-10)K-HVES-5G. Solis also states that legacy models up to and including the 5G series use a 4-pin logger, while many newer S6 hybrid models use USB loggers instead. For that reason, checking the physical communication port on the inverter before ordering is strongly recommended.

Technical specifications

• Supported device type: Solis inverter

• Number of connected inverters: up to 10

• Data collection interval: 5 minutes

• Communication interface: External 4-pin port

• Wireless communication: WiFi 802.11 b/g/n (2.4 GHz) and GSM/GPRS 850/900/1800/1900 MHz

• Near-end communication: BLE 4.2

• Configuration method: APP / WEB

• Operating voltage: DC 5V (+/-5%)

• Power consumption: ≤ 5W

• Operating temperature: -30°C to +65°C

• Protection degree: IP65

• Dimensions: 128 × 50 × 34 mm

• Weight: 80 g

• Certifications: CE, FCC

Important notes

• Supplied without SIM card

• A local SIM card is required for 4G use

• 5 GHz WiFi networks are not supported

• For multi-inverter monitoring, inverters must first be connected in an RS485 daisy chain

• Each inverter in the communication chain should be assigned a different slave address

• The network LED indicates connection type: green for WiFi and blue for 4G

The Solis S1-W4G-ST is a compact and reliable 4-pin WiFi + 4G data logger for compatible Solis inverters. It provides flexible remote monitoring through SolisCloud, supports Bluetooth local commissioning, and can connect up to 10 inverters in one RS485 chain. A practical choice for installers and users who need dependable Solis monitoring with both wireless and mobile communication options.