Parallel inverters and Modbus adapters
Posted: Mon Aug 11, 2025 8:44 pm
I’ve got a H1-5.0-E-G2 inverter already hooked up to a Waveshare RS485-to-ETH Modbus inverter, working well. I’m considering adding another inverter to work in parallel. As I understand it, the nathanmarlor HA integration supports multiple inverters.
I’m not too familiar with how Modbus works in practice with multiple devices. Would it just be a case of wiring the second inverter in series or parallel with the first on the same RS485 wiring, changing the Device ID of the second inverter, and configuring a second instance of the HA integration? I’d like to avoid having to buy another Waveshare gateway if possible, and the wiki guide for the device https://www.waveshare.com/wiki/RS485_TO_ETH_(B) indicates multiple devices are supported.
It also indicates a termination resistor will be required across the wires on the last slave. Anyone have any experience of whether this is needed and how to achieve it?
I’m not too familiar with how Modbus works in practice with multiple devices. Would it just be a case of wiring the second inverter in series or parallel with the first on the same RS485 wiring, changing the Device ID of the second inverter, and configuring a second instance of the HA integration? I’d like to avoid having to buy another Waveshare gateway if possible, and the wiki guide for the device https://www.waveshare.com/wiki/RS485_TO_ETH_(B) indicates multiple devices are supported.
It also indicates a termination resistor will be required across the wires on the last slave. Anyone have any experience of whether this is needed and how to achieve it?