Solar panels are generally robust and durable systems, but there are some circumstances and factors they are less resistant to. Here are some things to keep in mind:

1. Shade: Solar panels perform best in direct sunlight. Shade from trees, buildings, or other obstacles can reduce their efficiency. It is important to ensure that the solar panels receive as little shade as possible throughout the day.

2. Overheating: Excessive exposure to direct sunlight can lead to overheating of solar panels, which can reduce their efficiency. Ensure there is sufficient ventilation around the panels to prevent overheating.

3. Hail and storm damage: Solar panels are designed to withstand most weather conditions, but heavy hail or severe storms can cause damage. High-quality solar panels are often tested for durability and resistance to weather influences.

4. Water infiltration: Solar panels are generally waterproof, but it is important that installation is carried out correctly to prevent water infiltration. Poor installation can lead to leaks.

5. Neglecting maintenance: Although solar panels generally require little maintenance, it is important to regularly check for dirt, dust, bird droppings, and other contaminants that can reduce performance. Regular cleaning can maintain efficiency.

6. Extremely low temperatures: Solar panels can handle cold temperatures well, but extreme frost can theoretically reduce their performance. However, modern solar panels are designed to function in various climates.