* Sunlight is necessary: Solar panels generate electricity by converting sunlight into energy. Rain clouds block sunlight, preventing the panels from receiving the necessary energy.

* Water and electricity don't mix: While solar panels are weatherproof, water can interfere with their electrical components.

* Glass surface: The glass surface of the panel acts as a barrier for water to penetrate and reach the photovoltaic cells that generate electricity.

However, there are some factors to consider:

* Light rain: If the rain is light and brief, the panels might still receive enough sunlight to produce a small amount of energy.

* Indirect light: Even on a cloudy day, the panels can generate some electricity if they receive indirect sunlight.

* Sunlight after rain: As soon as the rain stops and the sun comes out, the panels will start producing electricity again.

In short, solar panels are not designed to work in the rain. They rely on direct or indirect sunlight to generate electricity.