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I agree 4 is overkill, 6 probably makes more sense. You could even probably get away with 8.
I just went with the absolute worst case scenario and went up a size.
5 feet of 4/4 600V SEOOW Cable. Link to the exact cable I bought
First pic shows the sub-panel wire going right, and the wire going to my house ATS going left.
Second is inside the sub-panel.
Small word of caution, if you intend to get the exact panel I used the ground bar won't accept 4ga...
Yeah....
Though I will argue that we are still technically on topic, just a little further down the rabbit hole than I'd imagine the OP originally intended.
My setup is an outdoor rated Sub-Panel mounted to the side of the unit. Amazon Link to Sub-Panel
2 NEMA 6-50R's on 50 amp breakers (240V)(Bottom Left 2)
1 NEMA 14-50R on a 50 amp breaker (240V)(Bottom Right most)
2 NEMA 5-20R's on 20 amp breakers (120V)(Mounted in a separate box on top)...