Tried the online calculator for an S5 running with 7 cent/kWh power cost... it chewed more power than it pooped BTC.
But it's still commanding 100usd apiece asking price. Any other use of that thing I dont know about??
Dont buy s5 anymore. If you have just sell it and buy s7 or s9. Even the website hashnest.com the bitmains arm for investment has closed its s5 miners due to high maintenance. If you want to earn beleive me just sell them. I am not an expert in mining but I just sold my three units of s5 miners due to less income. I am looking ahead that soon s5 will be useless to mining bitcoin and thats why at this moment I dispose them.