Gtx 1050 ti is a cheap /lower power and efficient card.

However with that budget, solar power and lack of knowledge i wouldnt go for something like that. Since its a cheap/low card the number of GPU's would be bigger and therefore increasing the number of rigs and difficulty of setup and maintenance.

The most popular options are:
AMD - rx 580 or vegas
Nvidia - gtx 1070 / 1080 ti


I advise you to read up alot more before making any decisions.