My single Phase 235 volt T21

[philipma1957]

Okay there was and is a nice thread by Danieleither.

https://bitcointalk.org/index.php?topic=5490991.msg63879624#msg63879624




It talks about buying T21 units and getting stuck with three phase power.

I did the same as Daniel in fact I ordered three 1 just came with 2 on the way.

I have single phase 230 and was really angry.


But With some work and looking for ways  some I found some are on danieleither thread.

I have a working t21 using a 230 volt psu .

quote of myself below

"my meter reads 2782 watts for 157th that is about 17.72 watts a th"

the software number reads high 3050+

[philipma1957]

spacer

so some power numbers

157th with cold air 45f open garage door  burns 2750 around 17.7
140th with cold air 45f  garage door burns 2460 around 17.5

will do 175th next.

[philipma1957]

spacer.


Parts needed a bitmain T21 miner

the correct controller I have the Civtek it is no good.

the epic controller with firmware 42 is mint and works.

proper buss bars. I ordered them from Altairtech but got short ones.

my s19xp has the right buss bars.

a s19 psu.

parts list from altairtech.

controller
https://altairtech.io/product/epic-umc/

psu
https://altairtech.io/product/epic-umc/

four pin pwm fans as the fans that come with the t21 have wrong connector.

epic controller wants standard four pin fans.

https://altairtech.io/product/antminer-120mm-replacement-fan-for-s19-s17-s11-s15-and-s9-series/


Note the
bus bars I ordered below are no good I will ask Altair-tech to check the rest of them. so they do not get sent to you and they are short mine were under cut by ¼ inch.

https://altairtech.io/product/antminer-power-bar/


I am tired will post more later tonight.  edit the buss bars are not long enough

[philipma1957]

spacer

garage door shut room kind of warm watts are  2868 hash 157




garage opened cools off around 20-30f



with temps cooler watts drop 2758/  th 157 = 17.5 watts a th for the t21 pretty fucking good.

[philipma1957]

here it is set to 180 th.

note it says watts are 19.1

meter gives me 18.5

and if I open the garage door to cool room meter gives me 17.5 watts

a nice piece of gear. two more on the way.

[philipma1957]

I am very ambitious about these T21's

I purchased an alpha miner psu.

It can do 7000 watts it is meant for liquid cooling I intend to

A) mod it for air cooling
B) use a buck boost transformer to boost volts to 255

add this setup to the T21 the psu can do 300 volts
the transformer can do 7000 watts.

in theory the t21 can over clock to 230 th
in theory the alpha psu can provide the watts needed.

This will take until late may as the next 2 t21's come in may.

[altair_tech]

Happy to see folks trying to get T21 to work on single phase. We've done this on a couple of test rigs and can't really tell a performance/efficiency difference between T21 and S21.
Yet the T21 is considerably cheaper, and comes with a Bigger PSU.
One issue I've encountered is that after you change the PSU and power bars, there doesn't seem to be an easy way to cover the power bars etc, since T21 does not come with a PSU cover piece.

[philipma1957]

Happy to see folks trying to get T21 to work on single phase. We've done this on a couple of test rigs and can't really tell a performance/efficiency difference between T21 and S21.
Yet the T21 is considerably cheaper, and comes with a Bigger PSU.
One issue I've encountered is that after you change the PSU and power bars, there doesn't seem to be an easy way to cover the power bars etc, since T21 does not come with a PSU cover piece.

yeah and the s19xp psu I used the cover does not quite fit.


I have three of these t21s i can get them to do 205th at 17.5 watts in a cold room.

i am going to experiment with the alpha 7000 watt liquid cooled psu. in theory the t21 can clock to 231 th with the correct psu.