JAK

@TheMafiaMan - NotMuffinMan, my understanding of @HendrikBigChief's post is that you're making changes to how the inverter interprets battery SOC.  By no means will the inverter disable the battery BMS!  So even when the bat-inverter interface is set to voltage mode, the BMS will still continue to do its thing (which in the case of the CFE appears to be shoddy...).  No LFP battery should ever be operated without a BMS.
It's however not clear to me what the difference in lifetime of an LFP battery will be when operated with an inverter in voltage mode as opposed to BMS mode.

Sorry, I only have one...

100% agree the mounting flexibility means nothing if the BMS/BAT is unreliable just unfortunate for me as i have dedicated space and will not be able to expand over time as i wanted to - this morning I did another test to qualm my paranoia with my two batteries and well this image shows it best

100%-7% on a 5.27kw constant load in 25min then back from 7% to 100% with a 40amp charge in 55min...flaky as all hell - and I'm running my DEYE in BMS Battery mode. As you can see the latest update I got from CFE now pins the batteries at 100% - I think after 1hr or possibly some other defined factor I'm not privy too, it does stop taking a charge and then discharges at about 30-40watt - not sure what the nominal discharge rate would be sitting idle.
I'll know on Monday if the Sunsynk batteries are from DEYE and if the inverter warranty extension applies - I think it won't but best to check my facts...even if it doesn't I might consider spending the extra to get the higher capacity but I'd prefer slightly smaller capacity and multiple batteries for redundancy if there was a failure of a pack etc. I'll let you know what i find out.