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Free Electricity ?? where and how??? Solar / wind requires initial investment and might not be enough for heavy duty miners.

Free where you don't get killed or arrested and don't have to live in the arctic zone??

thanks @deanlogic

Well, if you have a good running stream with the proper head flow, a micro-hydro generator can be made from scrap parts. Same can be said for wind. Wind turbines on a small scale can be built from scratch and there are different version for different wind options.

Also, with a fresnel lens and some ingenuity (still working on it) a Stirling Engine could be setup to produce energy to possibly run a PC.

Interesting @deanlogic although most of the miners I ran back then had 750Watt power supplies upto 1200Watts +. I can't remember the Amps but I am sure I was maxing out my circuits at 20 to 30 amps.

If anything offgrid can do that , wow!!

Well, I guess the key would be to cobble together multiple options to charge the battery bank that will run the computer.

Granted, the battery bank might be expensive.

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