Bird spikes are the other main option that is available to protect your solar panels from birds. They are designed to protrude from the roof at awkward angles in order to make birds just uncomfortable enough to choose elsewhere to land. They do not hurt the birds!
A replica predator is designed to work alongside either mesh or spikes to help deter birds from landing. It seems silly, but birds have been proven to avoid areas with replica predators such as owls on them. They are a cheap way to add additional protection for your panels.