i need as many bad things there is about solar panels
. Expen$ive. 2. Must be large to generate much useful energy 3. Don't work in the dark 4. Lose efficiency if not kept clean 5. Lose efficiency in less than full sunlight 6. STILL don't satisfy the tree huggers...they delayed a solar panel farm out west for years to wait on an environmental impact study of the land beneath the panels.
They require the use of Silicon which requires refining. This process of refining uses non-ecofriendly chemicals. It damages the environment. Solar panels are only about 20-30% efficient whereas coal is around 60-70%. Solar panels require much space for such small output. Do note, that new solar panels are being worked on and that with the correct alignment of solar cells, solar panels may become ~80% efficient, rendering coal useless.
If it is cloudy out, the solar panels won't pick up any sun, therefore they won't work. Also, not all areas actually get a lot of sun, so solar panels would only be useful in certain places.
They're really expensive. If you want it for practical use like a house or car powering system. They're bigger than like a battery if you're comparing size to power. Like a car battery can produce more energy than a 6 x 4 panel (just an example)