Are solar panels water proof

Solar panels is not exactly water proof.

Depends what you mean by "Solar Panel"

If it is the round or square discs that produces the energy, then they are not at all waterproof and easily get destroyed by it.

Solar Panels are normally sold encased in glass with an aluminumframe.

Most of these are sold as waterproof and have an estimated lifetime of 10-20 years depending on brand and make.