“ The Victron ISTR has an automatic "sync" for when it thinks the batts are full. This is where monitors get out of whack for whatever reason, so a cross check is useful. I don't trust automatic anything”
I agree, due to the lack of necessity to preform BMS cell balancing with each and every charge cycle, auto-sync’s can occasionally be few and far between, thus (due to habits) the potential exist for SOC drift...However the re-sync is based on programmed charged parameters having been met and thereafter occurs only after a several minute holding period - It’s with this in mind, and having 3 separate-source digital voltage readouts, that the Victron has so far proven reliable...No regrets ditching the former LinkLite, as the detailed smart phone windows and cycle historicity are truly outstanding...
3 tons, where the SUN usually Shines and Solar matters - lol