I just did what what you are asking about. I took my 1.5hp deep well off grid with grid backup. I have it set to prefer the batteries, and some may laugh at the 12v batteries running a 1.5hp pump, but I have no issues in 4 months. Pump only runs for about 70 seconds at a time to fill with pressure tank from 35-55psig.
I used this site as a blueprint for equipment, but purchased the following individually:
4Kw Aims 12Vdc-240V low frequency inverter
Two, 440W panels with tamarack racking on my well pump house roof
80A charge controller (could get away with 60A as I've never seen >65amps charging)
2X Ampere Time, 200AH 12V batteries in parallel
I took the house supply 240VAC and plugged it into the Aims inverter/charger
I installed a new sub panel which is fed from the inverter (now I have 120V out there as well!)
I adjusted my 9 zone sprinklers to run 2 zones a day, staggering them.
I have not seen my batteries below 40%.
Now I'm working on insulating and wiring 12V self heating as everything is in an un-insulated pump house.
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