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.