if you have very cheap electricity you can build a small farm of few rig and be very profitable and leave your job i think, the earning would be something like 3-4k usd per month, i would be very surprised if anyone is earning that much in real life job now lol
Yes that would be really surprising because apparently, electricity costs a lot every where. There's no place that gives you low-cost electricity which makes your plan a little too far fetched. Your plan would also need a large amount of capital considering the fact that you're targeting a profit of 3-4K USD and it would be extremely boring since there would be not much effort that has to be done once the setup is done.
Well why not try to build up your small farm of mining rig by using solar panel if you are getting expensive bill to your electricity bill then you need to invest also for solar power. But I'm pretty sure you are going to get the return of your investment for few months and you are going to have no problem with your electricity consumption.
Having a solar panel instead of having electricity from an electricity company will cost you a
lot. I don't wanna stress this that much but it will really cost you tons of money. Knowing that your "small farm" will be having mining rigs that should be able to generate 3-4K USD a month (in profits, other stuffs aren't counted yet in this price), then that means that you're gonna be needing an electricity that is sufficient to power these rigs every day and every night. With the additional electricity consumption for the ventilation of the mining rigs.
The mining rigs alone will cost you a lot, the land and the materials that will be used in building the room for the farm will cost you a lot, the solar panels will cost you a lot = This is some serious large amount of money.