Yes, solar panels can be damaged by hail. The extent of the damage, however, depends on various factors, including the size of the hailstones, the speed at which they fall, and the quality of the solar panels.

Modern solar panels are generally designed and tested to withstand various weather conditions, including hail. Many manufacturers conduct impact tests to ensure their panels can withstand hard objects such as hailstones. Panels that meet international standards should be able to withstand hail of a certain size and speed.

Smaller hailstones will typically cause less damage than larger ones, and the angle at which the hail hits can also have an impact. Severe, sudden hailstorms can, however, damage even well-designed solar panels.

If damage is suspected after a hailstorm, it is important to have a professional inspection carried out. Any damage to the panels can affect their performance. Many insurance policies cover damage to solar panels from hail, but it's important to check this and take quick action if issues are identified.

Overall, modern solar panels are robust and can withstand most hailstorms, but it is always wise to be cautious and have any damage checked by a professional.