Lost 16 psu's in one night Innosilicon T3+

[bitmonster1070]

So was looking to see if anyone has ever had any problems with Inno T3+'s ?    Been mining for a very long time and never had a prob with hardware like this.  Running this stuff for about a week and then boom, lost 16 in one night.  Popped the breaker on my pdu's.  Pulled it off the rack and plugged one in and a big spark out the back of the psu.  Running them at 208v and 60hz.   Looks like specs are 210-240v.   Also, last night was a humid night but not 90% or higher.   The psu's are potted and I have a very steady volume of air moving across all my machines all the time.  Any ideas on this,anyone ever had problems with these.  They are a used lot, but ran fine for a week or so.  Any ideas would be appreciated.

[HagssFIN]

Sounds like you have a unstable grid.
208 VAC is already too low as you said,
and maybe you had a "brown out" and there was a huge mains voltage drop which caused trouble for the psu input circuit.

[bitmonster1070]

Thank you , I will check into it and see what we find. Never happened before

[smracer]

It was the warm day we had yesterday then rain and 91% humidity.  The only PSU's that died were the ones closest to the air intake.

I opened a couple of the PSU's and found condensation.

[smracer]

Also popped the transistors. 

[HagssFIN]

Whoah, that's soaking wet

@smracer
Are you the same guy as OP? Or different guy who had similar incident?

[smracer]

We mine together.  I am local at the mine.  He is on a beach, earning interest.

Luckily, PSU's are cheap compared to the miners.  The miners all all fine.

[HagssFIN]

Okay. In the end it seems like a short circuit damage because of the water.

I don't know your air intake structure, but maybe it could be modified a bit to prevent such damage happening again?

[BitMaxz]

It looks like a MOSFET, not a transistor check the name value and search for a datasheet or diagram to check if the gate has some resistance coming, make sure the blew MOSFET are removed, and check it directly on the board if it has shorted on the gate then the PSU is shorted.

If you are lucky and it doesn't have shorted on the gate then you can just replace them. If you can't find a datasheet for that parts you can use known working PSUs to compare them.

[mikeywith]

I can't speak for these ino PSUs, but my Whatsminer M21s and M20s and Antmienr S9s work pretty fine at your said voltage, however, I had a similar issue when the humidity levels were not controlled in my farm, I lost a dozen PSUs and hash boards in one night, hopefully, yours is just PSUs.

What I do now is point some of the miners' exhaust to the cold side of the split room to keep the temperature high enough, and I have a few of these > https://www.amazon.com/dp/B07FBCTQ3L to watch the humidity and temp from home, it also gives you a nice chart showing humidity temp recorded in the past so you know if your farm needs adjustment.

Another important factor to control humidity would be the room pressure, make sure it's controlled as it makes things a lot worse.

[sidehack]

It looks like a MOSFET, not a transistor

The T in MOSFET stands for Transistor

[BitMaxz]

The T in MOSFET stands for Transistor

Yeah but if you only said it's a transistor they are too different in terms of function.