avalon miner 741 low mining speed

[bomoha]

Europe 240V

[philipma1957]

Europe 240V

this should work

http://www.ebay.co.uk/itm/High-Efficiency-2450-Watt-Power-Supply-Server-PSU-Antminer-Mining-Miner-Machine-/222669346248?


I think you have a psu issue because the light center high  on the avalon turns blue


and the board lights left and right turn green.

that means the gear is working.

[bomoha]

thank you all for the support. After replacing the power supply it started to work in the range of 5.8THs. I used two 850W Corsair power supplies as these were available and the change was noticed immediately after. The question remains open whether I should aim for a higher figure with the Avalon 741 miner?

[joel coin]

thank you all for the support. After replacing the power supply it started to work in the range of 5.8THs. I used two 850W Corsair power supplies as these were available and the change was noticed immediately after. The question remains open whether I should aim for a higher figure with the Avalon 741 miner?

hey bohoma, I just recently had an issue with my recently purchased Avalon Miner 741 as well... my issue was the 1 power supply I was using (HP 1200w hot plug psu + breakout board) was getting a low voltage from my American 110v power outlet, so it only produced enough wattage to power my Avalon for 10min at a time before it automatically shut down.
I did figure out how to make it work with that PSU, by changing in the Avalon Advanced settings view:

Status Tab > CGMiner Configuration > Voltage Offset setting that to -2
(I don't know if this is the proper way of setting things but it seems to work well)

Now my Avalon 741 works on the 1200w psu with the 110 v outlet, although the compromise is my TH is pretty pinned at 7.2-7.4 TH/s rather than being able to get 8 TH/s like it could with a proper PSU without the voltage offset.  I am doing this and waiting until I can get the 1600w Sorcerer power supply (that is specifically made for the Avalon 741 miner) when it comes available again so I get the full range of TH.

One question I have: why are you using two separate power supplies?  I have also made a similar search when researching my own PSU issues, and nowhere did I find it was proper to use two separate PSUs on an Avalon 741 (I only saw posts about people using the Bitmain Antminer with two separate PSUs, one for each board/side).  The problem I see is that each PSU is separately trying to adjust the output to the machine (without knowledge of the other PSU).  To me that seems like you might overwork both PSUs more than they should be, IMHO.

There may be no problem doing this with Avalons, but I have not seen it documented anywhere like i have seen with the Antminer.

Anyway, my recommendation is if you can do it get only one PSU and preferably something with a higher wattage ceiling so your avalon can get the full power (like the Sorcerer 1600w that Canaan makes).

[bomoha]

Hi Joel coin,
thanks for elaborating on your experience. Your point about two psu's is well taken, however, this information was taken from Avalon site itself.  Check this link:

https://canaan.io/question/avalonminer-741-power-supply/

I am in Europe and using 240V input, and I always thought that offsetting the voltage by -2 will probably have a different effect compared to 110V input.

what you are saying about the two psu's could be valid, but I don't have a big psu to validate and don't want to spend more money on this miner as I am doing it in order to learn and explore new opportunities.

I will write to Avalon tech support and I hope they can confirm, otherwise they should correct their website.

[joel coin]

Hi Joel coin,
thanks for elaborating on your experience. Your point about two psu's is well taken, however, this information was taken from Avalon site itself.  Check this link:

https://canaan.io/question/avalonminer-741-power-supply/

Oh wow, I am surprised I did not run across that link.  I guess it should work with two PSU's..

I am in Europe and using 240V input, and I always thought that offsetting the voltage by -2 will probably have a different effect compared to 110V input.

Have you tried any voltage offsets to get a better result from the miner?  I see there is also a +1 voltage offset which I am assuming would try to draw more power from the PSUs and in effect should get a higher TH/s.  I'm speculating because I cannot test it with my setup either.

what you are saying about the two psu's could be valid, but I don't have a big psu to validate and don't want to spend more money on this miner as I am doing it in order to learn and explore new opportunities.

I will write to Avalon tech support and I hope they can confirm, otherwise they should correct their website.

I don't know enough about PSUs or the internals to state what exactly could happen either negative or positive when using two with this miner, so if its working now probably ok to stick with what you have.  It also wouldn't hurt to confirm IF you can get Avalon support to reply back...

[SomovX999]

what coin is more profitable to mine now7

[joel coin]

what coin is more profitable to mine now7

Bitcoin?  I'm not sure how you mean "more profitable" ... it depends on what kind of coins you are able to mine, ie. if you have any ASIC mining machines, how many of them you have and what algorithm they were designed to perform (SHA256 or scrypt or X11 etc etc).  An Antminer S9 can't mine ether or Litecoin and an Antminer L3+ can't mine Bitcoin.
Lastly you need to know the sum/total GH/s or TH/s for each algorithm you have available.

If you're talking about GPU mining I'd say unless you have many many high end GPU's in a specialized mining rig, probably no coins are profitable to mine because of the cost of electricity involved, it wouldn't be that efficient or cost effective.

You really need to give more details when asking an open ended question like that, because the real answer to your vague question (without knowing any details) is "it depends"

Plus your question has nothing to do with the OP's question and reason for starting this thread, so its off topic.