As long as a solar panel is lower albedo than the object it's installed on, the effects you're mentioning will be an improvement over the baseline effects of human development. If you start replacing fields with solar farms you may have to worry, but for a rooftop installation a solar panel will absorb more energy than the average tar or asphalt shingle roof surface.
Even on fields its not an issue (especially if you replace fields where sheep graze), as the sun still wanders around, and the animals can stand below the panels comfortably.
