I've created this carry grip, which is designed to be used in pairs.

You can attach it to the frame the solar panel and then put a ropes through the side holes which can be pulled from the roof. When the module is at the top, you can use the grips to lift the module onto the roof and then install it.

It is recommended that you either build a slide with soft surface to pull the module up, or protect all edges and walls with soft material / styrofoam to prevent damage on your modules.

Printed them in PLA with tree supports (buildplate & critical regions only).

Used it for 25kg glas/glas Luxor 420W modules.