advice on best ASIC miner for 120V 15A or 20A circuits

[Deeped]

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.

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[BitMaxz]

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?  

No, you need a step-up transformer because the required power is around 200v/240v to reach the minimum hashrate.

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).

Not worth it to buy it may cost you more in electricity consumption than the newer miners.

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?

20 amp breaker for a single z11 miner is fine make sure that you have 220v/240v to give enough power.
Much better try to contact the bitmain for their next batch to buy these miners.

But I cannot find any mention of their site on this forum.

About the link, I tried to search it here but it seems someone promoting it here on the forum but all of them are deleted possible it is scam and spammy. Better to stay away from this website if you want to buy antminer ASIC better to directly buy to the manufacturer.

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.)

As I told you above better to directly buy to the manufacturer to be safe it is not safe to deal with a website which is not well known here on the forum.

Anyway maybe pre-ordering Z11 is better?  ~snip~

Yes it will be better to pre-order directly to https://shop.bitmain.com

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.

GPU still profitable if you are paying low in electricity bill but if you are living in high electricity rate better ignore GPU mining.

[Deeped]

My electric is fixed/low cost (not per kWh), that is why I was saying the even older ones are a "safer" bet in that they pay their cost in 1-2 months.  But obviously very little return overall since I only have 120 amps to work with in total.

I think I just missed the last pre-order with BitMain, unfortunately I don't know why they priced the latest Z11 at?

Eastshore.xyz has a decent reputation it seems from searching various forums, they still have the Z11e for sale - $1,400 for them... but the "E" batch was only 70ksol, from my searching:
https://www.eastshore.xyz/shop/antminer-z11-zcash-asic-miner-135k-for-zcash-mining/

Soooo... I think the safest bet for recouping is to buy used S9, any generation (they're all similar anyway - 12-14 TH/s, right), from AliBaba.  Used from eBay or Amazon would cost $650ish.  But Alibaba used ones are $200-350 range, with power upply.  I figure if I over-provision by 20-30%, I will have some spares/spare parts too.

Also like I said, the Z11 machines are still ramping up hashrate fast, so it seems much riskier!  Feels like there could be a 500ksol machine by next year... whereas SHA-256 seems to be slowing down a bit in terms of how much hashpower per joule can be achieved.  (and if not per joule, at least per dollar in ASIC cost, which is what I'm more concerned about)

GPUs just aren't doing well.  Six figures invested and will still take years to recuperate.  (return is only $2k a month)  Better to take the 50% hit on the gear, and put most of it into ASICs at this point I think, especially with Bitcoin out of its doldrums.

[Steamtyme]

I'm a little rusty on making 110/120V systems work for gear like the S9's or Avalon 841's. They both have the ability or firmware to be underclocked to work but it's a stress on the system. Here is a thread from a while back that goes over the considerations, and has links to how people have made it work. https://bitcointalk.org/index.php?topic=2799754.0
Personally though I suggest you put in 220/240 V circuits for your miners. It's not difficult and would be offset by the cost of an additional PSU. Considering you said your power cost is low and not based on consumption, you can get a more powerful machine that is less efficient - which will help your earnings.

I linked another thread to review as I'm not sure where you are planning to place this machine but there are plenty of factors to consider before investing in gear. Good luck.

Topics for you to review:
First time/Small miner reference for getting started.
Current List of Competitive Hardware - July 2019

https://bitcointalk.org/index.php?topic=2799754.0

[Deeped]

I'm a little rusty on making 110/120V systems work for gear like the S9's or Avalon 841's. They both have the ability or firmware to be underclocked to work but it's a stress on the system. Here is a thread from a while back that goes over the considerations, and has links to how people have made it work. https://bitcointalk.org/index.php?topic=2799754.0
Personally though I suggest you put in 220/240 V circuits for your miners. It's not difficult and would be offset by the cost of an additional PSU. Considering you said your power cost is low and not based on consumption, you can get a more powerful machine that is less efficient - which will help your earnings.

I linked another thread to review as I'm not sure where you are planning to place this machine but there are plenty of factors to consider before investing in gear. Good luck.

Topics for you to review:
First time/Small miner reference for getting started.
Current List of Competitive Hardware - July 2019

https://bitcointalk.org/index.php?topic=2799754.0

Thank you - I will check out that thread on the older ones and making them work on 120V!  [Edit - funny, that is one of the first ones I searched for and read yesterday. ]  I would love to change to 220V but, I cannot.  Building wiring is fixed and it is not my role to tell them what they can or cannot change.  Basically the space is an unused storage garage/shed.  I have had to let my GPU rigs run warm this year, last year I shut down half of them to keep stable temps under 80 deg F.

I am thinking it is best to just wait until I can order from Bitmain - I didn't realize they are still making S9 for example, and better than ever (16 TH on 1280 watts?  that is even better, almost fits on a 15 AMP circuit as-is!)... and $350, same price as the used ones from Alibaba!

The only things GPUs having going for them is they didn't lose as much value as ASICs from two years ago would have - BUT, there is MUCH more dollar value tied up in them.  So to me, even if new S9s only earn half as much in 6-9 months from now as they do today, they will still have covered themselves (something it will take another two years+ for my GPUs to do), and any extra funds I get back from selling my GPUs, I can just invest directly in bitcoin.

[Steamtyme]

Well that makes sense. Work with what you've got. Not sure how many batches of S9's they will re release or when you will get them. I have heard of some other members trying to reduce the power consumption on S9's by removing a single hashboard. reduce the TH and the Wattage at the same time. Could be another thing to think about especially if you wind up going with a used one down the road. If I come across some of the posts I'll link them here for you. Good luck.

[helmuc]

... 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.)

Hi, I think they are a pure SCAM website > just check their about us section > photos they use are dummy sample photos that probably came with a website template.

Stay away!

We did a general checkup on the site at fb.com/ibflv/videos/ to warn our users after one of our members started considering buying couple miners from them.

I have created a reddit post https://www.reddit.com/r/CryptoCurrency/comments/cbuplh/be_aware_new_scammer_on_the_block_geniminingcom/ as well to protect other less experienced people not to fall for these tempting offers.

H