How much btc could you mine a day with an antminer s1?
And how much cost these things nowadays, I am possibly interested in starting an mining operation
Short answer.
Don't get a S1 if you don't have "free electricity".
I can get free electricity if I want
But how much do antminers cost/earn a day?
So I am able to calculate my ROI.
There is several calculators which may help you to estimate your profit, but it isn't exactly easy because the difficulty keeps rising.
And block reward halving is coming.
http://tradebtc.net/bitcalc.phphttp://www.coinwarz.com/calculators/bitcoin-mining-calculatorIf you want a cheap, used and quite silent Antminer, I would go with Antminer S3 rather than with S1.
If you want a cheap used Antminer and you don't care about noise, I would go with Antminer S5.
If you want a cost-effective, power efficient and new Antminer, and you don't care about NOISE, I would go with Antminer S7.
If you want a cost-effective, power efficient and new miner and you want a reasonable amount of noise, I would go with Avalon 6 (though it isn't as cheap as S7).
See Ebay and Amazon for old Antminer and Avalon -miners.
Antminer S7 -
https://www.bitmaintech.com/productDetail.htm?pid=00020160325135953898HkhGgHy206C2Avalon 6 - link 1:
https://ehash.com/product/avalon6-v6-0/ link 2 (used):
http://holybitcoin.com/product/avalon-6-3500-ghs-sha256-bitcoin-miner/ link 3 (used, EU):
http://asicminer-shop.de/Avalon-6-33-TH/s-used-unitRemember that you need a proper PSU as well so notice it in your ROI calculations.