3 tons,
If you look at that thread I referenced you will see some interesting opinions on this particular issue you bring up.
For example, the problem the engineer in the video you posted is talking about is a problem that doesn't really exist in our application. Also the charge/discharge curve he's using as an example is not nearly as flat as a LiFePo4 curve. The drop off in current is going to be less than the 20% mark where you shouldn't be discharging anyway.
So while he is technically correct, it is an irrelevant detail in this application.
This is similar to the fact that Newtonian physics was proven wrong by Relativity. Sure it's wrong, but calculus is still very useful in applications where relativity has a negligible effect.
Again, I'm not seeing anything that shows the Victron is doing anything different to report on state of charge than the other meters mentioned.
