Thanks all. My questions are answered. I'll update post once done for future researchers.

and is my wiring assumption correct?

I should add there is no 120/240v switch on my PSU. So i assume it just figures it out on it's own? From single to double phase without a switch seems weird to me.

Hello all, I have some generic PSU that says voltage range 100-250v USA. Currently it's a standard USA 120v wall outlet. I am to understand it will run more efficiently on 240v. I'm very familiar with wiring so I guess I just want to confirm if I should, and how I should.

I have an older s7 miner, so I want to run it for all it's worth knowing it will soon be obsolete. I tried a moderate overclock and the plug started melting so I turned it back down. I'm assuming I can clock it back up safely on 240 though, since I was likely just exceeding the 120v wattage. It was nearly 1500w at the wall.

Overclocked or not, is 240v actually better?

I'm assuming I will just get an alternate plug like this https://www.ebay.com/itm/BITMAIN-APW3-220v-240v-HEAVY-DUTY-Power-Cord-Cable-For-Antminer-S9-L3-PSU/132423440999?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D49453%26meid%3D1fb4d5695fc34ae282832a958bf155a4%26pid%3D100678%26rk%3D2%26rkt%3D15%26sd%3D263415048800&_trksid=p2481888.c100678.m3607&_trkparms=pageci%253Ac591d1df-fafc-11e7-a2c1-74dbd18033b8%257Cparentrq%253A00aef3911610a861ef4892f0ffdc3dbd%257Ciid%253A1 and matching outlet setup, run the two hots to the rectangle and neutral to the round plug?

Any thoughts? Thanks!

so even though they all say "Alive" it will, presumably, default to pool 0 whenever it is active?

When running my older s7, my 3 antpool pools will occasionally all read dead and the miner will beep. Today I reset it 3 times and no change. Yes internet was good. So for the time being I made the third pool my slushpool.
Is there any problem with this? What happens when antpool and slushpool are both alive and running on my machine?
Will it end up with lower overall rewards since its splitting the efforts?

Thanks all. To follow up for any future troubleshooters:
I moved it down to 600 and it's holding happy right around 4.8th/s. It took about an hour to fully get going after the reset, but it's been fine since.
Only time will tell if the 600 is too much for it.
So I think I mostly needed to give it reboot time. But it did for sure need a reboot.

Current errors are at .0043%  is that acceptable or should i slow down?

So, it held nice at 575. Overnight I lost internet, then after net came back it got real bad. One board was only at 25 degrees and hashing was down to like 3.4. I tried setting back to 550 and no luck. Then I did a "reset" within the hardware and it came back, but strangely defaulted to 700m.
It was using 1575w at the wall, and speed was low 4s, with errors like 0.7500. So I turned it down (up from original) to 600m. It hanging at like 4.4-4.9 and errors at 0.0115%.

Anyway, any thoughts on what happened? I thought I burned out a board or something??? Was that a sign not to go above 550?

It's so generic I can't even find specs on the web. It's a Zumax zu1850.
Says
volts 100-240  (i'm using 110 for now)
current 20a
output 12v  /  154A  /  1850w

so I can't find any info other than that.

You say it's my limiting factor; how would I know my limit?

Think I should inch up my speed any more or just be happy with 4.6 out of this old thing?

In looking at my antpool graph, I keep seeing random dips to 0 on my speed on occasion. Any thoughts on what that is?

So at 575 that I moved it up to, for my machine that IS over clocked already it sounds like.
Running overnight at 575 my HW = 0.0002%  That is my error rate, right?
So can I assume that due to the lack of errors I'm NOT overtaxing this machine and I can run it here safely long term, or maybe even higher?
How do you really know if you're overworking it other than errors and temp? As long as those are happy is my machine happy?

S7 submodel s7 4.45
version 1.8
the has board says 550m
So the big 4.73 sticker on the side is a lie, huh?
Damn. I must have a VERY old s7

Looks like mine says 550. So I apparently got unlucky and got the slower version.
Some people say overclock. Some are saying it will explode and die.
I am trying some OC speeds.

@550 it gets 4430gh/s average @ 1260w = 0.0005907 BTC per day or  0.2171/year
@575 it gets 4620gh/s average @ 1330w = 0.0006175 BTC per day or  0.2264/year

I'm happy to try up an down to find  other speeds, but I want it to last at least a year.
I'm dissapointted it doesn't reach 4.7 even overclocked. Is that normal or expected?

so the fact that mine is only 54 degrees means i'm not even really 'overclocking" it yet? I'll creep it up to 60 and do some math

I see. So I need to do some trial and error and math; Compare Power use at wall (being watched) vs. Q vs. gh/s (while watching temp)

Currently
Q=550m
1258w at wall on 110v USA.
Average = 4,430.55gh/s
temp=50-53

I agree to run this bitch in to the ground. An s7 will likely be irrelevent in a year, so I want to use it for all it's worth.

Is there a calculator to do this, or do I just need my own math?

Thanks all for the help, I appreciate it!

My PSU says 1600w.

New guy here. I haven't found a ton of confirmed info on what speeds are safe to run on a standard PSU?
Thanks!