You better use 220VAC...
Egypt has a very low energy cost... it's not "necessary to use renew... so....
If you ant to get 1BTC per month... you might have to spend much more money than you think, because one unit of the S7 will give you 1/4 of BTC.... so you it's better use (at least) 4 units of the S7 and the PSU from bitmaintech....
http://www.coinwarz.com/calculators/bitcoin-mining-calculatorIt will gives you a primary view of what it is... it's not a small game... it involves money.. at least ~U$4000 and little more to make a good lokking view little "farm".
Mabe you losta little, but in the whole scenario, in the spce time, you certanly gonna win. I start to do mining with a batch of S1 in JAN 2014. Everyone tells me to stop mining, so I if had listened to them I won't have any btc now, because I'll pay my bills.... I did this a little but I did some schemes to stand up...
Mining is very cool, when you start you won't stop... even if your electricity bills are high, you will se many btc in your wallet, and our eyes you shine. aihaihiahaihu.
philipma1957 is a very experienced guy and runs a beautiful farm.
It's a good guy to hear.