Yep sabit is on, 10 is about right. Volts x amps at breaker = watts at the wall. Then amount of miners X actual power draw. The more room you leave the faster and cooler your miners/psu will run and more stable they will be. PSU choice is more of a quality/stability decision than power usage. Efficiency is marginal if your talking KW. I became a fan of corsair gold and up. Only PSU brand my s1 fleet didn't kill. I was maxed and hot with cords from every room though. Nothing like an atx that knows when to shut down without damage before a pcie, chip, or the PSU is fried. I knew I could leave the place and they were safe. Sure thing WMA. You got a sweet setup and an electrician buddy. If you got a 200 amp with loads of room I would ask for 60amp to replace the 20amp in that room if the lines can take it. 10 vs 3... You would be gravy and could add new incoming hardware to your 3 s7.
I know they put in new cables for the 240/20amp and the single 20amp line, I'm thinking they were all 14 AWG cables, but i'm not sure of the other wire gauges that are already installed in the room/house. Probably lighter gauge cables. I'll have to get him back over here soon with a pizza and a twelve-pack to "talk over" some more upgrades.
As far as the new upcoming S7 next week, I know I have the juice to handle it. After that, I will need some guidance from a professional electric man to keep my house from burning down. LOL
I DO keep a fire extinguisher right inside the door to the mining room. I also need to get a smoke detector for that room only. That has been on my mind for a while now.
I don't know what he will think about upping from 20 to 60 amp fuses in the main breaker box. Perhaps a separate breaker box can be run from the main for just the miner room would be an idea to consider. That would clean up a lot of issues and potential problems making things cleaner and clearer.
But for now, as you said, I'm golden.
Let's see some BLOCKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
edit: I do have some AC coming in currently at the intakes to the miners/PSU's. The air coming out of the miners is almost COOL. But I also have a 20" window fan in another window sucking the hot air outside. Man, it drops the room temperature down at least 40 degrees!