Looks like they've been working well over the years. Great to see since mine is still so new at only 6 months. My use case a little different as I was focused primarily on the backup capabilities given how frequent the power outages here are from the storms.
So far, I just love the ATS switching and the fact that no delays in the switchover like we had when on propane generator and would take a minute or two for the cutover, and then again when power was restored. The backup batteries and ATS switch happens so quickly that none of the clocks reset, the network and internet stays up, often without even a flicker... Really love the fact that there is no maintenance needed on the batteries like there is on the propane or gas generators, with spark plug replacements, oil changes, weekly testing, etc. and the like.
Your system is a little more advanced than mine. I'd like to see a justafiable use case for the same system but with our grid being so stable I just can't outlay the funds as I think I'll not get the return...not on the properties I mention here anyway. Down the track it may be a different situation... hopefully not too far down the track when I exit the workforce and completely change direction.
Agree, the large wall batteries not for everyone. I could certainly see you with a few of the new larger portable batteries they have though. Handy to take camping or worksite if not needed at home for backup!