How does a solar watch work? A solar watch never needs a battery change. If you are wondering how does a solar watch work, the model above shows it: light hits a solar cell, the cell charges a rechargeable battery, and that battery powers a normal quartz movement.
How does a solar watch work? The main parts
- Solar cell: converts light into electric current.
- Rechargeable battery: stores the energy for dark periods.
- Quartz movement: keeps time exactly like a standard quartz watch.
How long does a solar watch run in the dark?
A fully charged solar watch usually runs for several months without any light, and many have a power-saving mode that dims the display. Try the slider above: with the light at zero the battery slowly drains.
Solar vs other watch types
Solar is the lowest-maintenance option, ideal for travel and sport, such as the Casio MT-G solar example. Prefer a mechanical heart? See how an automatic watch works, or take our watch type quiz. In short, this is the answer to “how does a solar watch work?”
Now that you know how does a solar watch work, you can shop with confidence. For more background, see the Wikipedia article.
Buying tips
Before you buy, check the case size against your wrist, the water resistance rating and the strap type. Read a few recent reviews for the exact model, because real-world battery life and comfort matter more than the spec sheet. Compare two or three models in your budget, then pick the one you would be happy to wear every day. If you are still undecided, our watch type quiz narrows the choice in a minute.
How does a solar watch work: FAQ
Do solar watches work indoors?
Yes, indoor light charges them more slowly than sunlight, but it is enough to keep most watches running.
How long does the battery last?
For example, the rechargeable cell often lasts ten years or more.
Can a solar watch be overcharged?
No. Built-in protection stops charging when the battery is full.
