Back on point, on Friday I'm adding a 20 Amp breaker switch to my current breaker box, and on that circuit i'll run 3 outlets of 240V for the PSU's.. I did the math and I am still within the thresh hold of allocated energy needed..
Don't forget to allow about 20% derating on that "20 amps" for continuous usage, especially in the summer and ALLOW MORE if your breaker box is not in A/C in the summer.
The capacity of a breaker is normally rated at 40C - that's only 102 F, and you have to factor in the breakers NEXT to it also getting warm, the box retains some heat, and that 20 amps is an "intermittant service" rating NOT a 24/7 continuous duty rating.
Last summer when I was still in Iowa, I didn't use AC in most of my place (including where the breaker boxes were at), and with the temps hitting 100+ in the shade on a few days there were times that my 15A breakers were tripping with SLIGHTLY LESS THAN 10A OF LOAD on the circuit - on BRAND NEW QO breakers.
Part of my issue was I was using those "2 breakers in one housing" breakers on a couple circuits - those need to be heat-derated a LOT more - but even the single-per-housing breakers would trip if I put 12A of load on their circuit for more than a few minutes.
I'm probably going to go with a 30A breaker for the 'Ohms Law' you mentioned above about that 20%. Amps x V x.8 threshold = wattage roughly allocated if i'm not mistaken?.. I'll have that breaker running on its own circuit with 3x240v outlets ... Also bought a whole house surge protector that covers everything. Really didn't want any surges to trip up and fry anything in my setup.
My breaker/rigs are in a very cool and dry unfinished basement of my house.. With fans/possibly exhaust fans i'm hoping to manage the heat issue moving forward
