Do we have a simple pounds of carbon dioxide per total kilowatt hour produced over a specified (and assumed) lifespan, for the silicon panels?
That’s the number needed.
That number would vary greatly depending on the location and placement of the panels and maintenance to keep them clean and in good repair. Rest assured that the assumptions made by proponents are based on the panels being placed in mounts that track the sun from sunrise to sunset in a place that has no clouds, low humidity, and pollution and is close to the equator... It is not possible to rely on the numbers being supplied by manufacturers or proponents. Everything related to “renewable energy” is exaggerated to the nth degree.