The PV board on the MPPT RS 45/200 has 4 substantial red switches alongside each PV cable entry points, each with ‘C’ and ‘O’ on them. I presume for ‘Open’ and ‘Closed’. OOTB they are set to the ‘O’ position. I can’t find any reference to these online or in the paper manual. When connecting a PV array, should these be set to ‘C’ (I presume) or left as ‘O’? Also for any unused trackers, should these be left as ‘O’ so they float? What is their purpose? Are they MCBs or simply PV isolation switches? Thanks.
They are surge protectors and should be in the "O"pen position.
Don’t know about paper manual, but they are in the PDF manual, page 28, section 6.3.4.
Or HTML manual, the same 6.3.4 section, here: 6. Troubleshooting
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Thanks Alex! Yes these are missing from the paper manual I have with my “new” mppt rs solar controller (Rev 10 - 10/2023). Latest online manual version is Rev 13- 05/2024. I searched high and low for this online - didn’t know they were referred to as “safety relays” and didn’t spot the subtle differences between the online manuals and the paper ones. Thanks for finding for me
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