Adaptors & Wiring
RS485 wiring
RS485 requires a twisted pair, this works with CAT5 network cable and RJ-45 connectors.
If the RJ-45 connector on the inverter side is crimped according to T568A/T568B, you can use the pinout in the following table. If the two outermost colors you see on the connector are brown and green, it is probably T568A; if they are brown and orange, it is probably T568B.
| RJ45 Pin (inverter side) | Wire Color (when using T568A) | Wire Color (when using T568B) | RS485 pins |
|---|---|---|---|
| 1 | Green-White | Orange-White | B/D- |
| 2 | Green | Orange | A/D+ |
| 3 | Orange-White | Green-White | GND |
TIP
The newer inverters have a combined RS485 and CAN-BUS port. If your battery is already using the port for its CAN-BUS communications, you need to split the cable to connect your RS485 connector. The following articles explains the wiring of the port:
USB-to-RS485 adaptors
Wave USB-to-RS485 example
This is my preferred adaptor. It includes a GND and lightning/ESD protection, TVS diodes and a resettable fuse.
Wave also has a RS485-to-Ethernet module. (which does not work!)
USB-to-RS485 adaptor with cable example
Includes a GND and TVS diode and USB self recovery options.
Other tested adaptors
USB-to-RS485 3 Pin adaptor example
Includes a GND and TVS diode and USB self recovery options.
2-Wire USB-to-RS485 example
This is the adaptor I started with. It works, but does not include a GND, so your success might vary.
Ethernet-to-RS485 gateways
USR-W630 Wifi-to-RS485
This is a tested Wifi-to-RS485 gateway, which also includes a GND.
Requires
READ_SENSORS_BATCH_SIZEset to 8 or lessUSR-W610 Wifi-to-RS485
This is a tested Wifi-to-RS485 gateway. Usually significantly cheaper than the W630, however it does not include a GND.
Requires
READ_SENSORS_BATCH_SIZEset to 8 or lessHF5142B Modbus/serial to ethernet (4x RS232/485/422 to 4x E-Ports)
This gateway was tested with the Deye 8k EU Hybrid inverter. The following serial settings were used:
Sunsynk Inverters
Sunsynk 3.6kW Inverter
Sunsynk Ecco 3.6kW Hybrid Inverter
Model number: SUN-3.6K-SG04LP1-EU
This likely applies to similar models in the Ecco range: SUN-3K-SG04LP1-24-EU / SUN-3K-SG04LP1-EU / SUN-5K-SG04LP1-EU / SUN-6K-SG04LP1-EU
Closer view of the RS485/CAN port
Sunsynk 5.5kW Inverter
Tested with: USB-to-RS485 adaptor sourced from Banggood, very similar to this.
NOTE: RJ-45 port marked RS485 (bottom right) does not work.
Sunsynk 8.8kW Inverter
Tested with: USB-to-485 adaptor sourced from Micro Robotics, here
Deye Inverters
Deye 8kW Inverter
RS485 is the blue line - top left, as with the Sunsynk inverters. Yellow is the CAN-comms with the Pylontech batteries
Turbo-Energy Inverter
Turbo-Energy 5kW Inverter
Tested with: USB-to-RS485 adaptor sourced from Aliexpress, very similar to this.