Yes, solar panels can certainly be installed on a sloping roof. In fact, sloping roofs are one of the most common installation locations for solar panels. The optimal angle of the solar panels depends on the geographical location and the orientation of the roof. In many cases, solar panels are placed on sloping roofs with a slope that corresponds to the latitude of the location.
It is important to ensure that the roof is structurally suitable for the installation of solar panels and that the angle and orientation are optimal to capture as much sunlight as possible. In addition, there may be local building codes and regulations that need to be taken into account when installing solar panels. Consulting a solar energy professional can help determine the best approach for a specific situation.