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I just bought a Multiplus II 3000/48v and 16 LifePo4 cells. Im researching what BMS to get and leans to 123BMS.
I wonder if I need to get a power relay (to break connection between MP II and battery) for the BMS to control when to not allow charge/discharge or is it safe to let the BMS control the Remote On-Off switch of the Multiplus II? Or is that a stupid idea that I should just forget?
Look at the list of compatible battery management systems, a compatible BMS will be able to stop, start and control all aspects of the charge/discharge cycle.
I just read this guide:
https://www.victronenergy.se/upload/documents/Manual-Connecting-other-lithium-battery-systems-to-Multis-and-Quattros-EN.pdf
It confirms what you say and I understand it as I do not need a power relay, since the 123BMS has a "allow charge" and "allow dischage" relay to control the MPII with the assistants describe in above manual.
I will recommend JK BMS just watch some about them
