I use the Victron Multiplus "dedicated ignore AC input" option on my build too, however I don't charge the batteries all the way to full off of the grid. I charge from grid AC only if my battery SOC drops to 20% and I turn off the AC charge when my battery voltage reaches 26.96 V (on a 24 V system) for 5 minutes. This equates to a battery SOC of about 65% for my application. I shut off the AC charger at this level in order to leave headroom in the battery for solar input, allowing me to maximize my solar output. It works slick. If you charge your batteries all the way to 100% from the grid power, you risk having solar power available with no where to run unless you have some kind of other load sink capability. By the way I am enjoying watching you put your pack together. I'm a little envious.
Quite true. I wish voltage-based charging was more accurate. I'd like to have it stop at a certain SoC instead. But this isn't how I'll actually deploy the system -- right now it's the method I'm using to forcibly cycle the entire pack and stress/prove the system.
I also wish I could tell it to prioritize Solar instead of shore while connected so that I'm not needlessly cycling my battery nor pulling from shore if there's enough solar.