If you have certain practical skills, you can improve them yourself. The method is as follows:
1. Use epoxy glue (commercially available, AB double tube glue) to apply to the edges around the solar panel to prevent water and moisture from entering the solar panel from the side. .
2. Connect the cables. Wrap the exposed parts with electrical tape.
3. Find a way to stick the solar panel to an L-shaped wooden or metal plate. The tilt angle of the solar panel is about 45 degrees.
4. Place the fixed solar panel mentioned above on the roof (or on the south-facing windowsill) and you can use it.