PV Gap

Andrew Said:

What is a down side to solar energy?

We Answered:

I think the only down side is that no electricity is generated at night.

As for other answer mentioned energy used to produce panel, here is a interesting fact:

The energy payback time (i.e., the time it takes for a PV system to generate the same amount of energy that it took to manufacture the system) for PV systems is 2 to 5 years. Since a well-designed and maintained PV system will operate for more than 20 years, and a system without moving parts will operate for close to 30 years, PV systems produce far more energy over their useful life than we use to manufacture them.