Full is 1200 Max is 1600 Watts I presume (as I just called the jobber)
I use 1200 gal of water in the winter per month
I use 600 gal a day in the summer. Lots of gardening
That takes 2 hours pump time per month in winter.
That's an hour a day pump time in summer.
I use a 5000w generac to power it . works great.
I have 480 watts of solar
Freedon inverter 1000 watt
So whatelse is required More pv. more battery.
Your inverter is unlikely to run the pump based on what you've indicated here.
So you could stick with the generac, or you could get another, larger inverter for the pump.
2 hrs/month wouldn't justify it IMHO. Just run it when you have the generator running.
1 hr/day in summer is a different story though. I'm reluctant to suggest a cheap MSW inverter because I think mostly they're junk - but enough other people have had it work,
YOU might get away with it too.
If the pump takes 1600 watts (lets say), and runs 1hr/day, that's 1600 watt-hours per day.
If you get 400 watts from your panels, you would need 4 full hours sun just to power the pump for that hour.
If you get that, AND you don't need the power for other things, you would likely manage, although the difference between the 1600W load and 400W panels (1200 watts) would have to come out of the batteries. At 12V, thats 100 amps. Are your batteries up to it? Suck 100 amps for an hour? I think that'd be a battery-killer in short order.
Do the maths for your costs and needs, but more battery and more solar would seem to be indicated.