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+--- Thread: Connect Goodwe Inverter via RS485 Modbus RTU (/showthread.php?tid=4805)
Connect Goodwe Inverter via RS485 Modbus RTU - pioneersteffen - 03.06.2023
Hi @all,
I want to connect my Goodwe Inverter to W4K/LM via Modbus RTU. Attached you can find the protocol description.
I tried to transfer the document in a Modbus config and performed a Read Test for the “Ipv1” value (pictures attached) but unfortunately it doesn’t work.
Can you please help me and give me a hint what I may making wrong?
Many thanks for your help!
Best Regards
Steffen
RE: Connect Goodwe Inverter via RS485 Modbus RTU - admin - 05.06.2023
What error do you get when doing read test?
RE: Connect Goodwe Inverter via RS485 Modbus RTU - pioneersteffen - 17.06.2023
Hi Admin,
many thanks for the response and sorry for my late reply.
The failure message is timeout, see picture attached.
Any ideas what I need to change?
Many thanks for your help!
Best regards
Steffen
RE: Connect Goodwe Inverter via RS485 Modbus RTU - Daniel - 19.06.2023
Make sure RTU settings on the inverter are the same as in W4K, Try changing +/-
RE: Connect Goodwe Inverter via RS485 Modbus RTU - pioneersteffen - 22.06.2023
Hi Daniel,
I changed +/- and were successful in getting response from the inverter.
BUT now I getting a strange behavior of the W4K. It restarts every approximately every 3-4h. It is definitely related to the RS485 connection.
Any idea why? I have no resistor oder termination in the RS485 bus and just 2 wires D+/D- connected. Also just the W4K and the Goodwe inverter are on the BUS.
Many thanks for your help!
Best Regards
Steffen
RE: Connect Goodwe Inverter via RS485 Modbus RTU - pioneersteffen - 09.07.2023
Hi @all,
I found the solution for the issue. After I added 120 ohm resistor termination to the wiring no reset of W4K happened anymore.
Best regards
Steffen