The Sol Invictus, designed by Swiss watchmaker Cabestan, is the first perpetual mechanical timepiece using solar energy.
The watch employs modified silicium crystals as high efficiency solar cells that are suitable for small area and low luminosity solar power generation. Rechargeable lithium ion batteries help store the solar energy and power the timepiece.
Two brushless, medical standard, micro-motors 1.9mm (0.075”) in diameter and 5.5mm (0.217”) long, power the watch movement and set the time. An electronic micro-controller keeps everything synchronised to ensure accurate time-keeping.
The packaging of the watch is key to its striking design and function, with a tourbillon that uses a rotating assembly to align the mechanical parts with gravity.
Jean-François Ruchonnet’s revolutionary Cabestan movement is placed in the centre, with a two-axis balance 12 o’clock and 6 o’clock, along with two pivot mounted solar panels.
The handmade Sol Invictus sells for CHF595,000 (US$560,000) and is made to the customer's specifications.
Via Hodinkee
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