If you choose AntMiner S5 or SP20 make sure that you understand these things:
1. How difficulty will impact your operations. You can find number of Mining calculators which can help you. For example:
http://www.coinwarz.com/calculators/bitcoin-mining-calculator2. Since you believe your eletricity charge is included of rental price - do you know what is a maximum usage? Do you know how much will these boxes consume per 24hours?
3. Both boxes are great of perfomance, but they are noisy and producing lot of heat. You need to run it on place where you have connection to Internet (using ethernet cable)
I like your approach, just be prepared and understand your business. Good luck
1. I've made this estimate for 3.4 TH/s in 2015, basically it's a 10% per month cumulative sliding scale:
http://i.imgur.com/WuU2EbP.jpgIs this realistic?
2. Maximum usage is 3500 Watts per group. I have three groups of which 1 grounded (the kitchen group) and I'll use this one to power the machines. I don't know the maximum usage per day but I do know there's a 20% usage added 'at the wall' in regards to the original specs. 1155w I believe is orginal usage and I'm planning to get four of those 750w corsairs.
3. The room where they'll be put is a closed storage space built back in the day for 'other purposes'. Heat
is actively transported can find it's way outside since there is direct connection to the outside through a crude ventilation channel. If need be I can put up a airsucker and/or tabletop fans.
Thanks for explaining! If I'm missing something a point somewhere please do tell.
