unless u can find another purpose for the solar (light lighting a building) then dont bother imo, the mining system is starting to look weak on return unless you have a lot of power for short term.
So, don't forget to take in account the repairs u will need on solar over the years
Solar is a stupid investment right now since the installation costs are huge and there is little evidence of repair cost budgeting since its relatively modern.
Solar is a great investment if you know what you are doing I built my 10kw system and installed it for .60 dollars a watt normal prices are around 3-5 dollars.
Power will never be free, someone always must pay for it. Maybe when cold fusion will be used in every country, then power will cost close to nothing
Cold fusion is a pipe dream, nuclear fusion is the thing right now at MIT then are producing a system that could power the whole united states with double the electricity it produces right now. By firing 192 chemical lasers at a central point that contains hydrogen atoms. They then collect the resulting energy shed from the fusion.