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Thanks seb303, I wondered if I should put a relay in place between my PV panels and the MPPT to interrupt charging in case individual cells get overcharged? I will need to look into my MPPT and if I can control it directly from the BMS, I had bad information initially about the XP batteries and...

Well, now I feel silly, I just checked my MPPT, looks like I can have it control a few relays, without trouble.

Yes and no, they have a BMS, but it cannot really do much without an external BMS to disconnect it and enable the internal BMS to really function.

Ok, thanks that helps a lot. I am re-reading my manual for my MPPT. I have ordered a couple of large contactors based on Travis's recommendation.

Pretty sure they only balance with the external BMS,

This thread has a ton of in detail info about these batteries. https://diysolarforum.com/threads/valence-xp-super-thread.5683/

This thread is great, thanks for all the work. I am using 6 U27 12XP batteries plus 600w solar, with a backup 5kw generator in my RV. I have a Victron charger for shore-based charging, and an MPPT for solar charging, both set to a lower max output then 14.6v. I have ordered a MIUSA-BMSLV, it may...

Yeah, I was only thinking about something between the PV and controller, since it is bad for the controller to have the batteries removed while still connected to PV... or am I making it too complicated? My charge controller has high/low temp shutoff. I was just starting to get worried about...