question

Hi @xPatrik

TLDR: settings look fine!

1. Yes ESS grid setpoint of zero makes it so that the system balancing output with loads and solar such that the grid point is 0. That will get you lowest possible grid consumption.

2. I believe they're ignored if they are higher than what is set within multiplus charge settings. If they're lower then they take effect.

In relation to your settings.

BMS: I set mine to 3.6v and 2.8v), however my victron settings should ensure that those are never reached.

Inverter I'm even more conservative but for me it's because I have a small amount of solar so my batteries are often empty for me i set my DC shutdown to 46v restart 48v and input low pre-alarm 49.4.

Absorption voltage I go slightly higher 55.36 but essentially the same (with BMS balancing enabled at 55.2)

In regards to absorption time I'd play around with it, check the BMS settings make sure cells are balancing in that time frame but 1hr sounds fine to me. You may want to increase the repeated absorption time but play around with these see how your battery manages. Totally fine settings to start with in my opinion. And if cells are balancing with no issues then i'd leave them as is. If they're balancing a lot and often that's when i'd maybe increase the repeat time.

I'm also more conservative with my cut off voltages for each discharge current, I've set mine at 49, 49,48.5 48. However again this is because my batteries can often be empty for a few days so I wanted a decent buffer between shutoff and true empty.

Smart shunt. Charged voltage I personally set to same as absorption, but 55 to 55.2 will be minimal capacity so that's fine. Tail current I've got set higher 4% (but no real reason for it) however my absorption time is longer than yours.

Peukert exponent i use 1.02 and 98% efficiency but 1.01 is 99 is correct for an ideal LiFePO4, again you'll spot if this is off as smart shunt wont be consistent. ie charge to 100% then next full charge you'll maybe get 95% or vice versa.