Harness the Power of Light With These Solar Watches

Harnessing the energy of the sun to power time goes all the way back to the 1960s. Usually, it involves embedding photovoltaic cells on or under the dial of the watch, but the new PRC 100 Solar by Tissot switches things up by placing these panels right beneath the sapphire glass. It’s a cleaner approach that not only frees up dial design, but also optimises light absorption by reducing the layers rays have to penetrate. 

Don’t be alarmed by the visibility of these microscopic honeycomb-structured solar cells in the image above — they’re far more inconspicuous in the metal, practically invisible. They’re efficient to boot: 10 minutes of daylight provides 24 hours of battery life, with an impressive 14-month autonomy on a full charge. If the power ever runs low, the second hand shifts to a four-second interval to signal a recharge.

The fan-favourite TAG Heuer Formula 1 collection also gets a high-tech upgrade with Solargraph movements. First introduced on the Aquaracer line, the light-powered calibre provides a full day’s charge with just two minutes of direct sunlight. The updated models — three core and six limited editions — feature upsized 38mm cases and signature bezels re-engineered in TH Polylight, a lightweight, durable material that comes in a kaleidoscope of colours. It’s a playful twist on retro styling, made for everyday wear.