I mentioned this in another thread - but I am not convinced there is an issue with BMS high voltage disconnecting. I have certainly not seen anything in running a LiFePO4 battery with a MOSFET based BMS for several years, and I have not heard of anything from the thousands of folks running Battleborn batteries with MOSFET BMS built in. Again if you suspect this might be an issue a clamping diode (TVS) across the output ports will protect against this.
I hate to say it, but I think your new setup will cause you many more problems than the Deligreen you had previously.
Charing based on SOC is a risky and unnecessary proposition. Coulomb counting SOC estimates are subject to integration errors - that is to say the small inherent errors in measuring current add up over hours, days and weeks to very large errors in SOC. The way Victron and other coulomb counting meters deal with this is to resync the SOC accounting on every full charge - ie when the voltage gets to some level that is indicative of 100% SOC (say 13.8V on a LiFePO4) then it resets the SOC to 100%. The problem is if you only charge to 90% SOC, you never have an opportunity to resync and the SOC measurement will get way out of sync from your batteries actual SOC.
It would be much more reliable just to use voltage to terminate charge - which is how everyone else does it. I am guessing you are trying to maximize battery cycle life by not charging to 100%, but this is more easily done by setting your charge voltage to 3.4 - 3.5 V/cell and is a secondary concern at best.
I don't know what your usage scenario is - but 8Ah a day to run the BMS and relays is a huge parasitic load and your battery will be dead flat if it sits for even a month. Typical MOSFET BMS have parasitic loads in the micro-amps. This may or may not be an issue for your particular usage scenario, but would be an issue for most camper batteries.
The Chargery BMS looks nice and gives you great feedback, but I would disable the SOC limits and switch to using MOSFETs (or Solid state relays) set on voltage limits. You could safely use the low SOC trigger to shut off the loads, but a low voltage limit should work fine for this too.
Good to know the High Voltage Disconnects may not be that big of a problem. I have not connected any DC loads, besides the inverter, to the pack. The fridge was the only dc load I was concerned about with HVD.
My plan was not to charge based on SoC. I guess that's what I made it sound like, but not my intention. Basically my solar controller will be set to cut out at a certain pack voltage. For example 14.0V ( charge limit or 14.0 and float at 13.5), still researching the solar controller settings. Then have the BMS set to open the charge relay at 3.55V per cell or 14.2V. The AC charger wants to charge to 3.6V per cell or 14.4V. If I want to allow the pack to charge to 100%, 3.6V per cell, then I can easily change that setting on the BMS display and allow the AC charger to fully charge the pack. An active balancer is always attached during charging or discharging.
I would also set the BMS to open the Load relay when the pack gets to low, say 3.10V per cell or 12.4V.
One of the reasons I switched to this BMS is that it did Coulomb counting and also provided a per cell monitoring. Two things I did not have with my original setup.
Yes, 8Ah a day is a large load when storing the batteries. I would not store the pack with the Relays closed. I would discharge the pack to 60% and open the relays by disconnecting the BMS and even disconnect the balancer. I normally don't store the battery in the trailer either and keep it in the garage.