To deal with energy transition due to climate change and a rise in average global temperature. photovoltaic (PV) conversion appears to be a promising technology in sunny regions. However. PV production is directly linked with weather conditions and the day/night cycle. https://www.bekindtopets.com/flash-grab-Viqua-F4-Ultraviolet-Water-System-Powered-by-UVMax-36-gpm-top-savings/