Re: bild it your self (D.I.Y enegy)

You’ve hit both ends of the spectrum at once; solar panels are impossible, the others easy.

A small amount of study into energy and motion and you can build your gear:

solar water heater – reflector to focus sunlight, dark coloured container to absorb energy and hold heated water

wind turbine – any DC fan, the larger the better.

What you pay for is efficiency, packaging and marketing!