FoxESS Community - Owners & Installers Forum

Hi all, hope this is the right section for this, please move it if not.

I’m controlling my H1-6.0-E-G2 via Modbus (Waveshare RS485 PoE).

There have been a couple of occasions where the RCD for my system has tripped, and the installers are sending someone out next week to take a look. I don’t think that the Modbus connection has anything to do with it (I think it’s because they’ve installed a 30 mA RCD instead of the 100 mA that FoxESS recommend), but am wondering if I should remove the Modbus connection before they arrive?

Essentially, I don’t want the Modbus connection to be used as a scapegoat if there’s an issue with the system.

Has anyone had any issues with installers taking exception to the Modbus connection being used?

Thanks.

No, i’ve never heard of modbus being used as an excuse, in fact a lot of installers will pre-wire your inverter in preparation for it and whilst Fox don’t support 3rd party apps they will provide the modbus protocol document upon request.

If the RCD is tripping it needs to be investigated for wiring issues, but it could be a faulty RCD tripping early (i’ve seen 30mA RCD’s tripping at 15-20mA) , Fox recommend in their installation guide a minimum of 100mA RCD unless local regulations apply.

Thanks for the reassurance Dave, I'll leave it connected. I wasn't sure how 'official' modbus control is.

Hopefully they'll get to the root of the issue. On both occasions when it tripped it's been very wet/humid weather which, if I understand correctly, can increase earth leakage - so hopefully just a matter of putting in a 100 mA RCD if appropriate.