I work in mining. S9 is a very old model and very inefficient compared to today's models. Expensive unstable power is the opposite of a good mining environment. You'll likely loose money on this deal. Mining generally is almost impossible to make more SATs than you spend unless you have some edge, like subsidized power, valuable use for heat, etc. It would be a hell of a learning tool though, 4-5 years idle... eeek!