Looking for UPS (Uninterrupted Power Supply) Recommendations

[Euphoria]

I need a new UPS but I could really use some recommendations and advice, please.

 

Requirements:

• Must be 1000w output or more (I have a meter on my outlet, at full load with all monitors and peripherals it can pull around 900w from the wall)
• Must have external battery terminals for Deep cycle / leisure / solar batteries
• Must be compatible with high capacity 12v batteries; 150Ah minimum, 200-300Ah preferred

Nice to have but not essential:

• USB interface to connect to a PC would be helpful so the PC knows it's on a battery
• Work fine with multiple batteries in parallel so I could add 2x 100Ah batteries to make one single 200Ah 12v backup (not serial)

I've been looking at this one Kemot ProSinus 1200w which has a few good reviews but it's not very well known and doesn't have the USB interface so my PC wouldn't know it on battery which is a shame.

Any recommendations or advice would be really appreciated, thank you.

[IPD]

I know Eaton has external plugs for daisy-chaining batteries, so I imagine it should be possible to hook up whatever power source you were wanting.