The miners themselves, will have a shorter lif the power supplies will have a very short life.
Either get some decent battery backups to hold over the power fluctuations or accept the fact that as power goes up and down you are sending the wrong voltage through a lot of the components and that will shorten their lifespan.
-Dave
I wish I can get some sort of backup, unfortunately I can't. My only solution is to figure another location with better voltage. How "short" of life span would you give the PSU or the Miners?