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As far as I know only rich people can afford that on the Hungary. "Rich" as in earning high enough wage to loan the necessary millions (in HUF). It earns back on the long run it is sure for years I saw some people invest in it at least for a decade.
To make it from scratch I would need more electrical knowledge and still would need pre-manufactured components which cost fairly high. I would have to make modifications on the house to install the stuff, on the roofs for example or make room for batteries and inverter and such. Wiring needs to be modified. Time, work, money. Would be a nice project tho.
Or you mean some small portable stuff? Maybe an immersion heater can be operated by it?