How does a solar watch work?
A solar watch is essentially a quartz watch – with one decisive difference: it draws its energy from light and stores it in a rechargeable cell. Regular battery changes are no longer needed.
The solar cell beneath the dial
A flat solar cell sits beneath a light-permeable dial. It converts daylight and artificial light into electricity. The dial is designed to let enough light through without the cell being visible.
Energy storage
The electricity charges a rechargeable cell or capacitor. Fully charged, a solar watch often keeps running for several months without light, depending on the model. Many models have a power-saving mode and warn of low charge – for example with a jumping seconds hand.
Timekeeping
Time itself is measured by a quartz movement, so accuracy is the same as a quartz watch.
Everyday tips
- Avoid keeping the watch permanently under a long sleeve.
- Place it in daylight now and then – but not in direct sun behind glass, where it can get very hot.
- The rechargeable cell ages slowly and may need replacing after many years.
Who is a solar watch for?
For anyone who wants an accurate, low-maintenance everyday watch without battery changes.