Since I use SMA, I would use 2x SI 6048US, 12kW to 24kW of earlier model Sunny Boy (5000US ... 8000US), balance of PV panels on Midnight charge controllers. Actually,, for off-grid, I would consider 3-phase 120/208Y.

If PV panels were of a couple orientations, 37kW of panels would peak around 24kW, so up to 100% could be AC coupled, but for all output to go to battery, half AC coupled and half DC coupled since 2x SI can charge about 12kW.

With some AC coupled, your loads would be powered PV direct, giving battery inverters a rest.

Schneider should be able to do the same thing, for models that support AC coupling.

4x SI

https://www.ebay.com/itm/295247353891
2x SI & Midnight Classic 250 (the 150V model would handle more watts)

https://www.ebay.com/itm/304667704930
SB (11kW model 240V only, not 208V)

https://www.ebay.com/itm/125963032554
What do you think of Kubota? There should be many near-new ones from DC Solar trailers.

Here's an older 6.5kW for $2000

https://www.ebay.com/itm/125917758638
Brand new 11kW for $7800

https://www.ebay.com/itm/374562225550
While 5kW generator would be small for a house, if inverter can add its power then it supplements surge load, so generator only supplies average load & charging while it runs. FLA battery's desired charge current (0.12C?) plus simultaneous loads may be what you want, for proper charging during overcast.