Abstract. Some extremely interesting PV active BIPV (Building Integrated Photo-Voltaics) applications have been proposed in the past in terms of windows, up to those (for instance: one European patent dated 1983 and one Chinese patent dated 2014) that integrate mono and poli- crystalline PV cells in louvre windows. None of those patented/produced so far allow, though, for a homogeneous transparency of the louvers to be obtained. With this innovation patent invention as in claims 1,2,3,4 and 5 the louvers become efficient generators of electricity, while also pro-actively enhancing natural ventilation and -another important innovative trait of the invention - do not have a negative impact visually on the building occupiers and/or by-standers. The weakness of the previous generations of PV Building Integrated semi-transparent louvers - unwelcome visual impact - is overcome by means of using the new amorphous silicon available technology (and experimenting with new thin film and micro PV technologies) to let the PV technology undertake a mimetic process compared to traditional glass, while in fact aiding more the building overall energy efficiency, compared to standard glass (by being PV active and also a UV resistant and low- emissivity one and by taking advantage of the invention as in claims 1,2 3, 4 and 5). The levels of transparency that the PV active glazing can reach are only 30% with available technology (perhaps more with experimental ones), but it is anticipated, that, given the high levels of solar irradiance some areas (eg of Australia, and/or in which obscure glazing is in use anyway) have, it will prove not to be a problem, at least there. Invention will help use louvers - old and new more efficiently energy-wise. Invention as in claims 1,2,3,4 and 5, can be as simple as a diagram to be explained to end user [and/or in schools and as an app he/she can use- also tailored depending on end user level of technological expertise, age, occupation and other parameters (eg site and sun parameters). Enhancing solar electricity production in an optimized way, while carefully trading off natural ventilation, will be the ultimate goal of the invention, especially when its upgraded automated version[/s] is [are] prepared/released. The innovation is very useful for people with diverse ability levels - as - in its automated version[s - while the generic app can help people with mobility issues, another one can be a variation especially suited to somebody visually impaired {eg: with audio commands/comments/output)]- it adjusts louvers for them automatically and in an optimum way: trading off solar electrical energy production, natural ventilation, Daylight Factor and visual requirements. stY a Figure W. Section of possiblel upgrade of BlP s: similar to existing prototypes but wit the amorphous silicon (or other PV) technology glazing instead an edition of the [minimum] "steps" diagram based slats/blades moving/adjusting automated mechanism (input g a computer program dedicated specifically to the task).Outside the upgraded BIlPV Louvres go also sma anemometers. Previous two pages: old patents for traditional glass louvers.