A 3D printed nozzle in the center of this apparatus is attached to a 12 V water pump ... 20 W solar panel keeps the whole thing charged so you don’t have to run mains power out to your pond.

Researchers in Italy have designed a novel carbon dioxide heat pump that can work with photovoltaic-thermal energy, a finned coil heat exchanger and a U-tube borehole heat exchanger. Their experiment ...

Had the panels been functional, each pond would have generated the equivalent ... produced by Floating Islands International, ...