For users requiring a more stable connection than Wi-Fi, the SolarFlow 1600 AC+ includes an RJ45 port designed for physical RS485 communication with smart monitoring devices like the Zendure Smart Meter (3CT-S or 1CT-S).
¶ RJ45 Port Technical Pinout and Connection Guide
This port facilitates high-speed data exchange between the battery system and your household's digital meter to ensure real-time energy scheduling and accuracy.
¶ 1. Pin Definitions (T568B Standard)
The RJ45 plug on the SolarFlow 1600 AC+ follows the T568B pin order. Ensure your cabling matches the mapping below:
| Pin Number | Definition | Function |
| 1 | RS485 B | RS485 Data Differential (-) |
| 2 | RS485 A | RS485 Data Differential (+) |
| 3 | N.C. | Not Connected |
| 4 | N.C. | Not Connected |
| 5 | DI1 | Reserved digital input (dry contact) |
| 6 | DI2 | Reserved digital input (dry contact) |
| 7 | N.C. | Not Connected |
| 8 | N.C. | Not Connected |
¶ 2. Mandatory Wiring Logic
To ensure signal integrity and prevent hardware damage, you must adhere to the following electrical logic:
- Twisted Pair Requirement: RS485 A (Pin 2) and RS485 B (Pin 1) must be carried on the same twisted pair within the cable to mitigate electromagnetic interference.
- Ethernet Prohibition: This port is NOT an Ethernet port. Do NOT connect it to a network switch, home router, or Power over Ethernet (PoE) equipment, as this will likely result in permanent system failure.
¶ 3. Physical Installation Steps
- Route the Cable: Pass the communication cable through the provided cable gland to maintain the unit's IP65 weatherproofing.
- Crimp the Connector: Using a standard RJ45 crimping tool, wire the plug according to the T568B sequence defined above.
- Remove Protective Cap: Uncap the RJ45 port located on the higher side of the SolarFlow 1600 AC+ unit.
- Secure Connection: Insert the RJ45 connector firmly into the port until you hear a clear "Click" sound.
- Seal the Gland: Tighten the cable gland to ensure no moisture can enter the port housing.
¶ 4. Troubleshooting the Connection
- No Data in App: Verify that your Smart Meter (3CT-S) is powered on and that the A/B wires are not swapped at the meter terminals.
- Signal Drops: Ensure the cable length does not exceed 100 meters and is not running parallel to high-voltage AC lines which can cause signal noise.