If you directed all the input to the penny, then you've created a close system that can't lose energy, and doesn't the whole system - including the sun - keep r

If you directed all the input to the penny, then you've created a close system that can't lose energy, and doesn't the whole system - including the sun - keep rising in temperature anyway? Ultimately the outside of this inverted sun system needs to vent the whole of the energy, the energy can't just fall inwards. What you're describing is a reversal though; it requires the penny to be much hotter than the sun, only as a result of the sun's energy flowing into it.