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I've spotted a recent topic on the same challenges --> https://diysolarforum.com/threads/my-2-x-growatt-spf-5000-es-trigger-the-upstream-rcbo-when-working-in-parallel.54728/

If only the RCD decouples (32a) and no other "downstream" classic breaker (25a), is it possible that improper or missing ground to generate such an issue?

It worked! many thanks!

that easy? I have to RS485 adaptors but never came to my mind to connect a second one to the RPi. I'll give it a try later today. thanks!

Hi everyone, I have a Growatt SPF5k inverter with two Lifepo4 batteries, each controlled by it's own BMS (JK 100A). I there a way to connect both BMS's to Solar Assistant? Currently it's only one connected via RS485 dongle and the details aren't accurate (-50%). Option would be to use inverter...