m21s from Whatsminer is arriving this Saturday, July 27

Pangolinminer is sending me an m21s and it should get here tomorrow. It’s supposed to hit 56th and run on 3300 watts. Not really sure if it has a low-speed option.

Spacer. Feel free to post your thoughts on this unit. edit: This m21s sells for 1900         The m20s sells for 2800 Pre trump tax Pre shipping. Both use 3300 watts. One does 55 th the other does 68th. So you get about 13 th for free power and pay 900 in cash for that. 0.00002777 x 13 x 10200= 3.67 a day so 900/3.67 = 245 days. The extra shipping is 50 The extra trump tax is 225 So 275 extra if. USA based Makes 1175/3.67= 314 days. So it may make no difference as to which you buy. As 245 to 314 days is a lot. M21s is in house will be running it soon.  It basically looks just like the m20s. So the good news it is up and running yeah baby. It has a working low power firmware yesss!!! imgur is down can not link photos back  up and here is gui it has yet to tune on low tuned on low it is really quiet fans are well under 2000 rpm does 29th at 1750 watts about 60 watts a th this is a 1900usd unit running it at 29th means a long roi even if power is free ,but it would make a decent space heater for the winter. So if noise is an issue you could use this gear. 29th is   29 x 0.00002777 x 9500 = $7.65 usd a day for low speed and free power.

Nice I knew you planned to spread out your gear purchases, but didn't know you were looking at the 21's. Nice to see Whatsminer is starting to launch units with working LPM, ideally this will role out for the other models soon. While nothing special at low power costs they are definitely viable, might be a nice unit to host with Pangolin for some if that service pans out. Keep the shipping and import costs down.

https://pangolinminer.com/product/whatsminer-m21s-with-psu/ 1905 + shipping + trump tax corrected the error.

These are shipping Nov. for everyone but Phil

I wish as I could use ten yesterday. I now have 2 m20s. Demo model 1 m21s. Demo model 1 s17 pro 53th----------------not a demo 1 t17 40 th -------------------not a demo 2 a1041 37th beta model 1 inno t3 t39------------------not a demo And waiting on 1 Inno t3 t50. What do I think of all the gear above? If it were the world according to Phil I would have purchased all s17 pro 53 th 100 of them I had a chance to buy 100 for 220000 usd the window was small and I was short that much cash. But it would have been a really good move. By the time I got it I new I should have ordered more. I have 160kwatts so 100 s17 pro 53th set to low speed will pull 1450x100= 145kwatts and do about 100 x 40 = 4 ph Back to the m21s. It is pretty quiet it is 91 f in my garage and it has a fan speed set to about 1800 rpm on low speed. You can’t tell it is running on low speed. High speed it will wail. The most disappointing of all above was the inno t3 t39 The avalon I can't judge since it was a beta model  the psu is not the stock one.

Yea best pricing was end of Q1, early Q2 with most shipping dates to go with. My T2T 30T are pretty nice besides the lack of fan tuning unless temps are 50C which is never. If the M21s is really that quiet, I'd be happy with that too. Only have room for 2200w so basically one more unit before having to replace gear.

some high speed results 55,915 at 3460 watts  gave me 61.87 watts a th.  it is loud and industrial at high speed second test  I got 55,915 at 3480 watts about 62.2 watts a th. I will do a low speed 10 hour watt use test. I have a hourly kilowatt meter.does very good numbers overnight more accurate then a kwatt meter. I wish low speed was more power efficient then 60 watts a th which is why I will do a longer more accurate test. it is quiet on low  and does 29th and 1750 watts fans at 1750-1850 rpm I just set it to high I am guessing it will not be quiet.  Would love to see if it can do 55th It is still tuning fans at 5500 Okay we are at 55.9th  nasty pitch noise pulls 3550 watts about 63.5 watts a th so I am a bit under 56th spec at 55.9 but +- 5% with ease my power at 3550 vs 3360 is +5.6%   but they have watts at -+10 % This is industrial if you run it at top speed and it easily can run in your house on low speed. If you have it at home maybe you can turn it up in the day and down at nite.

So you check meter at like 000070.00   and ten hours later it reads 000087.00  then 87-70 = 17/10  1.7kwatts an hour for low?

Hope so.    Meter was at 001070.00   so 10 hours should be 16.5 to 17.5 kwatts 7 hours later  meter reads 001081.67   1081.67  -1070.00       11.67 11.67/7 = 1.667 kwatts  or 1667 constant watts  it hashed at 29.054th  so    1667/29.054 = 57.3759  watts a th on low   so my  hourly kwatt meter tends to be more accurate then a cheapo kwatt meter. so low speed is 57-58 watts a th and right now in a cooler room it is 740 am, My fan speed is 1500rpm  so you can use  it on low speed in your home and not piss people off. 10 hour reading 1086.70 1070.00 16.70 kwatts /10   = 1670 watts after a 10 hour test.  and hashing at 29059gh so 1670/29.059 = 57.469 watts a Th. This gear would be best for a place that can be noisy at least 1/2 the day.  But that it needs to be quiet say six to 12 hours a day. Pretend you do 56 for 1/2 and 29 for 1/2 you get an average of 42.5th each day. Efficiency seems to be 57 to 58 watts on low which is somewhat disappointing. It is about 61 to 63 watts on high speed which is pretty good.

For noise reduction I have been messaging a guy that sells this. https://www.ebay.com/itm/273926631722?ul_noapp=true He can redo the design for a m21s/m20 at a cost of 150 EUR and sell it then for 160 EUR. Do you think it would be an option to go this path to make it quieter to run the miner at full speed.  He can put a 6 in exhaust port to flex duct the heat outside. What do you think?

I think it will over heat at high power setting. I think at low power setting it will not be necessary to use it. The issue is  the unit is moving  3300-3500 watts of heat at high speed.  It is old school 1 tube design not the shorter 2 tube stack design of the s17 or avalon a1041 The baffles will simply restrict the airflow  and it will overheat. s-9 = 1200-1400 watts high speed m21s m20s   3300-3500 watts high speed m21s uses 140 mm fans  it moves more air to cool 2x the heat s9 uses      120mm fans  it does not need to move as much air. If the whatsminer went with  the settings the newest s9 firmware offers : -0.5 th -1.0 th -1.5 th -2.0 th -2.5 th -3.0 th low speed enhanced i think the box  could be used if you had multiple settings pretend  you had 55th top speed 50th 45th 40th ----------  this would pull say 40/55 x 3500 = 2545 watts  this may not over heat. 35th 30th

The designer says this. The total cross-section of the cutouts in every dampener plate is bigger than the cross-section of the fan outlet. So air-flow wise, the box should handle it. I am considering paying him to have a redesign and order one for testing. I can post the heat results and then if they seem good then people can order from him thru eBay. Low power is an option but it's like owning a Ferrari but only putting it in first gear.

I am all for testing and science.  But my gut tells me  the m20s and the m21s will struggle in the box. Upside is if it works  you can mine them  in your home. Both unit m20s and m21s  are pushing the envelope of safety in the power cord.  as the c19/c20 jacks  rate at 16amps in a 24/7/365 constant run time. my tests on 3 separate pieces 2x m20s and 1 m21s  show they pull over 3400 watts close to 3500 watts. all my tests were done  with power in the 237 to 243 volts range. 3500/243 = 14.403 amps = okay 3500/237 = 14.768 amps = okay    but in my tests  power cords have open air  so they will rate closer to the 16amps in a hot box  the power cord will stress more due to heat..  and that  14.768  will become borderline safe. in clifton farm where noise is a none issue  we range from  217 to 231 watts 3500/231 = 15.1515 amps = okay and we placed the three units closest to the cool air intake fans 3500/217 = 16.129 amps = wrong  but just barely.  plus 3 huge fans hit it with cold air. So I caution you with the box 1) really check it a lot. 2) measure volts 3) measure watts 4) measure temps 5) measure sound. good luck would love to see if you can tame these beasts.  m21s and or m20s @ whatsminer    please give  us 3 or 4 speed settings

Yes my concern is also the load on the c19/c20. Close to the 16A rating. Although the M20S on Pangolin goes from 68T to 62T with power rating from 3260W to 2977W. On my order it does not state what the Th/s rating will be so my guess is it will be what they ship. So you could get a 62T version which would give it a bit more safety on power consumption and if you can run the M20S on low power mode then that would reduce the noise. So many decisions and unknowns.

yeah it is tough.  I mined since 2012. I have found  that  if you are right on the boarder of a safe load over time 3,6,9 months that wire starts to fail. These units are on the border of safety for the c19/c20 cables.  So if you test  if could be good for weeks or even months then fail. I could bullshit like I am an expert on the physical property of wire coatings.  Truth is I am not ,but I am well read. Most wire covers are plastic derived vinyl based insulation.  Constant warmth  tends to slowly damage them  and they fail. I have had more then a dozen warm wires  melt and fail over time.  Latest one was these pcie wires in this psu see link https://www.ebay.com/itm/200V-240V-2450W-Power-Supply-for-Antminer-S9-T9-S7-L3-Mining-LOT-MA/253950507883? ran none stop from Nov 2018 to aug 2019  finally failed last week. I have had iec 320 13/14 cables fail. and c19/c20 cables all were over  3,6,9,12 months time as they were close  to the edge.

Has anyone tried using a splitter on this miner?  I feel like it's a horrible idea but figured I would ask first.  I got a good deal if I want it for the 54th models of these m21s's but... I run all my miners on pdu's and even at 3240, I don't see how this can be reliable plugged into a pdu pulling that much power.  Unless the power cord coming out of the unit split in 2 (Sort of like the bitmain s17's do) and I can plug them into each bank.

One option could be to make your own 10 AWG cable. https://www.mouser.com/ProductDetail/Schurter/43000921?qs=%2Fha2pyFaduhFb9VPTXCo5zKca%252BgdnppnLs1JQQYxQIQ%3D https://www.schurter.com/datasheet/0921 https://www.homedepot.com/p/Southwire-By-the-Foot-10-3-600-Volt-CU-Black-Flexible-Portable-Power-SOOW-Cord-55809799/204632922 The datasheet for the connector says it only supports up to 12 awg wire, but I bet you could get the 10 awg in with a little effort.

I use these https://www.ebay.com/itm/L6-30P-to-C19-Molded-Power-Cord-10ft-220V-250V-30A-Ships-Free/202648792458? direct to the wall plug.  so on a 30amp circuit they use 14-16 amps.  I still can make it work well  since I have 9 circuits to a 225 amp sub panel. And six subpanels 9 x 24 = 216  which would be hard on the sub-panel  and can trip it on a 95f day. so I do 2 of these  at say 2 x 15 = 30  and 7 x 24 = 168    Thus 168 + 30 = 198 which is easier on a 225 sub panel If we went all m20s  I would truly be afraid of a meltdown since I know we run from 217 to 227 volts.

That's the thing, I am trying to avoid using direct to wall.  I have the power and the outlets available to use but I would rather plug this into a pdu somehow.  I do not like plugging anything in especially 3000w+ that is running 24/7 direct to wall.  It seems not many people are buying these units using 3000w+ (Probably this is why) so I can get them at a rather good price lately.  Why in the living hell they wouldn't make this a 2 cord unit like the s17 is... is mind blowing.  I would like to get these on my 240v pdu's somehow but no clue how.  My idea was which I don't even think they make, get a like.. c13 connector to miners power supply into 2 nema normal outlets which you can plug both into a pdu.  This would hypothetically split the current up between each side to about 1250w each. Also, does this miner take c19 or c13 connection plug into the power supply?