question

Hi Jean-Luc. The portal access does help, thanks for that. And I asked for your batt type, just to ensure no exotic bms is in place..

I like the 'kiss principle'. If no need to complicate it, don't. Consider this...

Set your Quatro charger to (say) 25.6V, both Absorb and Float settings. So your batts won't discharge lower than that, and the shore not charge higher. A 'neutral' level (that you could experiment with, especially if your bmv is tuned in correctly).

Set your mppt's higher than that, so they'll have priority while the sun is up. But not too aggressively. You're not daily-cycling your batts, so no need for that 28.8V Absorb. Maybe even as low as 27.0V for an hour in Absorb, then to a 'maintenance level' Float of 26.4V.

Any ac loads while the sun is up, the pv should step up to cover them, and after dark the shore will maintain at least a 'standing V' on your batts.

ESS, especially with no anti-islanding, isn't welcome on the exposed male pins of a shore plug, where ac voltage can feedback, even if only for seconds.

Aaah, ok. I've misinterpreted you a little. Apologies.

You could look to Virtual Switch (ignore ac). There's a thread here on it (link too): https://community.victronenergy.com/questions/19953/virtual-switch-settings-on-veconfig.html

You *may* find your batts get a little 'light exercise', but if set up carefully should only be at the very top end, and probably better for them anyway. Take a look-see.

My other offerings still stand though. Use as you will..

Re the 'aggressive' charge algorithm, Victron actually have certain kit that can determine when 'storage mode' is warranted and apply it as needed: https://www.victronenergy.com/upload/documents/Datasheet-Blue-Smart-IP22-Charger-180-265-VAC-EN.pdf

Worth reading the (brief) reasoning for that feature. Both your chargers should be configurable to do much the same.

Take care 'overdoing' your batts, they'll last longer if you're gentle with them.