Okay some generators put out a square wave and not a sine wave
and some psu's are fuck you I want a sine wave not a square wave approximation of a sign wave.
And a 1200 watt psu running against a 1400 watt gen is not good.
more like use a 2000 watt gen.
https://www.amazon.com/dp/B093RB5XH4/ref=sspa_dk_detail_4?the one above is a 2000/2300 and is sine wave rated
it is likely the bare minimum you need
"About this item
2,300 Peak Watts/ 2,000 Rated Watts
Capable of up to 6 Hours of Operation at Half Load on 1.18 Gallons of Fuel
Compact Suitcase Design, Weighing Less than 47 lbs for Easy Handling
Quiet Operation (59 dB) make it Virtually Silent from just 10 feet away
Stable Sine Wave Technology provides pure, safe electrical power for powering and charging laptops, cell phones, and other sensitive electronic devices"
the key points are
1)stable sine wave tech
2) 2000 constant 2300 peak watts
I have this gen below
https://www.amazon.com/CRAFTSMAN-Craftman-1700-Inverter-Generator/dp/B07P5XRQPR/ref=sr_1_3?it is pretty much the same as the ford it runs just about anything up to 1200-1300 watts