Originally Posted by Paul L
Sunpower is not in the business of selling to small-time installations. Their authorized dealers deal with large residential and industrial installations. Think multi-palet size. Getting their panels usually means some excess from a job. Their panels tend to be very large and high voltage.
You are quite right, Paul, about SunPower Dealers and who they sell to. But you are referring to the Dealers who sell to land-based installations, using panels that are at a minimum of 250watts. These panels are not warrantied for marine installations, since they are not designed for that type of harsh environment
As Scott Berg notes, Solara and Solbian manufacture marine-grade panels using SunPower solar cells, with SunPower's permission. The restriction is that the panels can be no larger than 140watts - to ensure these panels will not compete with their Dealers in the established land-based-market. Which only makes glass panels, not the flexible and semi-flexible panels available for boats and RVs.
Dealers of the Solara and Solbian solar panels
will sell one panel, or multi panels, whatever the customer needs for their application. And yes, they are more expensive that the SunPower panels designed for building rooftops - as happens with most things manufactured on a smaller scale for a niche market.