Tesla’s solar roof tiles stand apart from other integrated solar roofing options in part because they’re camouflaged – you can’t even tell the tiles are collecting solar power. But have you ever wondered what kind of tech it took to make that happen? A new Tesla patent released this week shows how they did it. Here’s a hint: it wasn’t easy.

Tesla solar roof patent illustration

Tesla worked with Panasonic to create a grid of solar panels that could link together without taking forever to install. On top of that, they had to create the tiles in such a way that they appeared opaque from the street but remained transparent to the sun above – all while still being as efficient as possible. To solve this problem, they created a new kind of glass with small louvers, which make the glass look opaque when viewed from below while keeping it open to sunlight.

Related: Tesla starts installing solar roofs in California

The patent application says that each solar tile “includes a backsheet layer, a bottom encapsulant layer adjacent the backsheet layer, a plurality of photovoltaic cells adjacent the bottom encapsulant layer, a top encapsulant layer adjacent the plurality of photovoltaic cells having a plurality of louvers constructed therein to block side view of the plurality of photovoltaic cells, and a top layer adjacent the top encapsulant layer.” If that doesn’t clear things up for you, here’s a picture:

Tesla solar roof patent illustration of a cross section of the solar roof

If you want to dive into all the technicalities, you can find the full patent here.

+ Tesla Solar Roof

Via Elektrek

Images via Tesla