Hello everyone,
I’m working on setting up a small solar farm in a remote location with poor cell service and no internet access. The setup includes 8 Growatt inverters, all model MAX 125KTL3-X LV. The Growatt app normally requires an internet connection (which seems counterintuitive for remote sites), but it has an offline mode that allows direct connection to the inverters.
My goal is to monitor all the inverters together using RS485 connections. When I connect just one inverter to my server, I can easily retrieve data from it. However, as soon as I add a second inverter (or more), I stop getting any data at all.
I strongly suspect the issue is that all the inverters have the same default Modbus ID (likely 1), causing conflicts on the bus. I haven’t been able to find any option in the app to change these IDs.
Additionally, when I try accessing the inverters’ web admin panel, it prompts for a login. The default credentials are supposed to be “admin/admin,” but that doesn’t work. I’ve tried various combinations like different capitalizations of “admin,” sequences of zeros, “12345,” and other common defaults, but nothing succeeds. These units are brand new, so I’m puzzled—could the password have been changed already? More importantly, how can I change the Modbus IDs for each inverter?