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Those butterfly labs lumps are small. They're useful to people who want to steal electricity because they can be easily hidden.

So, if you can buy them cheap second hand, and are okay with stealing electricity and installing them in hidden locations, then you might make a bit of money.

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Doesn't it need to be connected to a computer to work?

You can connect up to 7 to a rpi.

If electricity price is the main problem, why not go solar?

You'd probably make more selling the solar electricity then

because that adds capital cost. You're paying for the bitcoin mining unit and for the solar panels.

For the older GPU bitcoin mining farms you'd need a substantial solar array to cover costs! That's at least one good thing about fpgas and asics - lower running costs.

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