question

That's a system design question which is better handled by a professional.

Just quickly going through your list I can see that physical placement may matter (i.e. are the panels/pumps separated or grouped, and how far are they apart?) Remote control management - ok, wireless or wired, and from where? Do you have an existing conduit/pathway for wired? Do you have existing locations to fit the equipment into? When do you need the pumps to run? What if there isn't enough light? When you say regenerative, do you mean providing power back into the grid? (in which case, depending on your location there may be anti-islanding requirements).

Someone will have to work through questions like these with you (and/or suss out from a site visit) to work up proposed designs.

Hey Incree

I’m planning a very similar project and keen to use Victron for remote management.

Did you find away to control the pump from Victron?

I found something here that don't need any battery (not Victron):

https://www.mppsolar.com/v3/sp-series-3-phase/

Backup power can be taken from grid, but I don't thonk thats required. I have no further info.