Installing solar panels on RV roof without drilling is possible using alternative mounting methods such as adhesive tapes or brackets that clamp onto the roof. Here are a few common non-drilling installation methods for RV roofs:

1. Adhesive Tapes: There are specialized high-strength adhesive tapes available that are designed to bond the solar panels to the roof surface. These tapes provide a strong and secure attachment without the need for drilling. Make sure to choose tapes specifically designed for outdoor applications and capable of handling the weight and stress of the solar panels.

2. Mounting Brackets: Some companies offer solar mounting brackets that are designed to clamp onto the edges of the RV roof. These brackets can provide a secure attachment point for the solar panels without requiring any drilling. The panels can be mounted to the brackets using bolts or other fastening methods.

3. Portable Solar Panels: Another option for RV owners who don't want to mount panels permanently is to use portable solar panels. These panels come with their own support stands and can be placed on the ground or on the RV roof without any drilling or permanent installation. They are typically connected to the RV's battery system using cables.

It's important to note that the suitability of these methods may depend on the specific make and model of your RV and the type of solar panels being used. It's recommended to consult with a professional installer or the manufacturer of the solar panels to ensure a safe and proper installation.