In electricity generation, temperature affects voltage output. When the temperature of the solar panels on your roof increases, output decreases. If you can therefore keep the panels cool, you'll generate more power.
You could set-up some sort of sprinkler system. Increased output of 10-20% has been reported. Disadvantages include the cost of continuously supplying water to the panels; and water droplets deflect away from the solar cells a slight portion of the light required to generate electricity.
To avoid such disadvantages, could you instead encase each panel in clear glass in a clear aqueous solution? You wouldn't need to keep supplying water; and deflection could be reduced allowing almost all of the sunlight to reach the solar cell where electricity is generated. Output could improve by an estimated 40% or more.
Issues: the aqueous solution must not heat-up too much; it must not freeze; it must not deflect too much light away from reaching the solar cells; and it must not corrode the solar panel.
Experiments still need to be done.
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