A novel application. I first thought it was for a hot-water application but it is definitely a photo-voltaic panel.
I would like to see some real data to back-up their claims. I woulds suspect that this design would have problems when used on a boat. Breakage; cleaning salt
and bird do-do from around the tubes and reflector. How the hermetic seal holds up to pounding waves.
My understanding of solar PV is that it is the direct incidence of the short-wave portion of the solar that provides the most energy. Diffuse short wave solar (deflected from atmospheric gas) is a much lesser portion of the enery budget
. Reflected short-wave from the reflector would be getting into the long-wave spectrum that only generates heat (short wave turns to long wave after it strikes an object). This design would not get as much direct solar, as compared to a flat panel, if that is the case. I am no expert but that is my view. I would like to see some side-by-side data comparisons to verify their claims.