This was a question that came to me as I looked at men installing black solar panels in India.
I'm not sure about the answer to this question either because the heat would be stored in the metal and glass parts of the solar cells but likely not in the earth itself. So, I know this is a very odd kind of question.
Where does all the heat go when absorbed into something black like solar cells? Where does this heat absorbed by the sun go? Into the black glass or the metal surrounding the solar cells where it is mounted? But, it wouldn't go into the ground because solar cells generally shade the ground and prevent plant growth below the solar cells except for plants that like shade like jungle plants and such. So, I suppose in those areas with a lot of rainfall shade plants would be planted underneath solar panels to prevent soil erosion during rains and floods so the solar panel frames wouldn't be washed away along with the solar panels.
I know for example, when white ice turns into blue water in the arctic and antarctic seasonally it causes major increases in heat in the oceans which then act like a battery for heat even above the polar circles during much of the year now. Summer and Fall which would be the opposite in Arctic and Antarctic areas.
I know for example, that asphalt brings more heat into the earth than cement. But, cement bring more heat into the earth than greenery of all kinds simply because the shade of the greenery tends to keep the ground cooler.
Also, in cities one can reduce air conditioning bills by painting their roofs white which often happens when people realize that painting decks and roofs white reflects both light and heat vertically back up into the sky towards the sun and away from the ground and dwellings. Insulation up to 8 inches thick "Spun Glass" "Fiberglass" is also helpful in summer as well as winter time to reduce both heating and cooling bills over time too as well as double pane glass on windows keeps temperatures more even year around too.
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