Installing photovoltaic solar panels generally requires working on a roof, which can be dangerous, so expert help is typically recommended. In addition, the electrical work needs to be done by experts.
Roofing is considered a dangerous job since small mistakes can lead to potentially deadly falls. Solar panels are heavy, and people without training might have trouble moving them safely. Furthermore, solar panels must be attached to the roof securely; mistakes can damage the roof, leading to expensive repairs. In most areas, the complex electrical work required when installing solar panels must be done by trained electricians. Hiring a company to perform the job might lead to discounted electrical work by people who have extensive training working with the panels sold by the company.