Hello,

I am trying to figure out which miner is best.  I have 120 amps in total of 120V power I can use.  The newer S15 and S17 have built-in power so they cannot be configured to use 2x 120V power supplies, right?  So I think I am limited to the older S9, and even then might need to underclock a bit.  I do not have option of changing power, it's fixed.  (but also low rate)

The safest bet would be to buy the old S7 because they're cheap and on Amazon/eBay, and would recoup their cost in a month, but never would earn much.  (power supply would cost more than the machine).

Other thing I considered is Z11, that SEEMS to be ok at 1400 watts on a 20 amp breaker?  But very hard to find a reliable source to buy.  For example, the newest one is the 135ksol, but those are not out yet, are they?  I've contacted this company twice and they swear they have them in stock:

https://genimining.com/product/bitmain-antminer-z11-135ksol-s-zcash-miner-brand-new/

But I cannot find any mention of their site on this forum.  On the other hand, people vouch for that lakeshore xyz one all the time, and they don't have much in stock - either pre order for z11 or hydro S9.  But at least they show mostly out of stock, whereas this genimining.com has EVERYTHING in stock.  (But site looks well done otherwise, even better than the xyz site.)

Anyway maybe pre-ordering Z11 is better?  But, i don't want to get stuck in a "space race" ASIC.  Equihash miners have doubled their output a few times so far!  Whereas SHA-256 miners have leveled out a bit more.  Yes, the new S17 is almost four times the latest S9, but it uses a bit more power too, and costs a lot more.

Any other things I should look at?  Trying to get out of the GPU game, these things will never ROI and I fear there will be no more good GPU coins soon.