The subject says most of it.
I can get a SP20 for around $500. I pay .05/wh for 20 hours per day. For the other four hours I pay .29/kw.
could I throttle the power automatically so consumption goes way down during peak hours?
And at what future difficulty will that machine be obsolete?
you need to turn it off those 4 hours.
As to profitable at 5 cents give me a minute or 2
BTW 500 usd is too much.
pretend you are 24 hours at 5 cents
pretend it is free not 500
BTC = 450
if the difficulty is 8% it will earn .333 btc by July 1 and then coins will half