How Does A Solar Powered Watch Work?

What if you would never have to worry about changing the batteries of your watch? Sounds unreal, doesn’t it?

Well, with solar watches, you can stop worrying about charging the batteries since they’re always charging when exposed to light. As a result, the time displayed by a solar watch is extremely accurate.

Although solar-powered watches have been around since the 1970s, they have greatly improved their technology, leading to modern-day solar watches.

Wondering how a solar watch works? In this article, we will jump into the details of solar-powered watches and learn everything there is to know about their working mechanism, pros and cons, lithium-ion batteries, eco-drive technology, and much more.

Key Takeaways

• Solar-powered watches continuously charge when exposed to light, ensuring accurate timekeeping and eliminating the need for battery changes.
• These watches use photovoltaic systems to convert light into electrical energy, storing it in rechargeable lithium-ion batteries for extended use.
• While solar watches are more expensive than traditional quartz watches, they offer eco-friendly benefits, long-lasting batteries, and the ability to charge even in artificial light, making them a sustainable choice.

The Evolution Of Solar Watches

Solar watches manufactured in the early days, back in the 1970s, were uniquely designed to fit the photovoltaic (PV) cells that would power the watch. Nepro, Sicura, and Synchronar were a few famous manufacturers.

By the 1980s, inexpensive solar-powered watches became popular among children. These watches often featured famous characters.

Solar watches then underwent major changes in the 1990s, when the Citizen Eco-Drive range of watches was launched. Since then, there have been many technological advancements in the capacity and efficiency of these watches.

Popular watch brands, such as Casio, Orient, Seiko, and Junghans, also introduced solar-powered watches. Citizen and Seiko solar watches are now widely used.

The Technology Behind Solar Watches

Let us break down the working of a solar watch.

A solar-powered watch essentially converts the light into electrical energy. It employs a photovoltaic system, something which is traditionally used in solar panels.

The solar cell is typically positioned under the watch dial surface. When the cell is exposed to light, it induces an electric current that stimulates the free electrons within the panel.

The electrical energy gets passed on to a battery, and it remains stored over there, creating a solar power reserve. The battery uses the energy collected in the rechargeable cell to power the watch.

Solar Powered Watches vs. Traditional Watches

Solar watches are sometimes called solar quartz watches since all other functions of the watch are the same as that of a traditional quartz watch.

They come with a vibrating quartz crystal within the circuit for accuracy in timekeeping. Moreover, the quartz ensures a beat rate of a tick every second.

However, solar watches differ from traditional watches in terms of battery. While traditional quartz watches come with disposable batteries, a solar-powered watch features rechargeable batteries.

These batteries are often found in the form of lithium-ion cells. A rechargeable cell can potentially be recharged thousands of times before it needs to be replaced.

Recharging is actually quite effective, given a full charge can create a solar power reserve for several months, even without light exposure.

How Long Does It Take To Charge A Solar Watch?

The time required to charge a solar watch depends upon various factors.

For example, a Citizen Eco-Drive branded watch can fully charge in about 2 hours on a bright and sunny day.

Type Of Light

Light can either be natural sunlight or artificial light. Sunlight charges a solar watch faster than artificial light does.

Power Absorption Capability

Your watch model can also influence how quickly it gets charged. It is affected by the technology used in the solar panel of the watch.

Light Intensity

If the weather is dark and cloudy on a particular day, your solar-powered watch will not charge as quickly as it would on a bright and sunny day.

Pros And Cons Of Solar Powered Watches

Solar technology is getting popular by the day, and people are choosing solar-powered watches over traditional ones.

While it does have its shortcomings, the benefits of a solar watch outweigh its limitations.

Let us look at some of the pros and cons of solar-powered watches.

Pros

• The solar panel is always charging when exposed to light.
• Solar watches require little to no Maintainance.
• Lithium-ion batteries can last for over 10 years
• A solar watch is better for the environment.
• Solar watches come equipped with large power reserves that can hold a charge for almost six months without sun exposure.

Cons

• Solar watches are a little more expensive than regular quartz watches.

Frequently Asked Questions

Let us explore a few typically asked questions about solar-powered watches.

Can A Solar Watch Work With Artificial Light?

Although natural light is the best source of energy to power solar panels, artificial light can also get the job done. However, there will be differences in how each light source works: sunlight or artificial light.

Charging with solar power will yield the fastest speed, while an artificial light source will charge comparatively slowly.

Does A Solar Watch Last Forever?

Solar-powered watches are fitted with lithium-ion batteries. The battery life of these cells is typically about a couple of decades.

You can recharge these batteries hundreds of times, and eventually, they will wear out. Since solar watches are not automatic watches but mechanical ones, people prefer to replace the watch once the battry dies, instead of getting it repaired or changing the battery.

Can Solar Powered Watches Be Overcharged?

No, you cannot overcharge a solar watch. These solar watches come with protective functions that protect the lithium-ion battery against damage from a light source when it is already charged.

However, overheating is a possibility with solar watches. Excess exposure to artificial light or sunlight cannot cause trouble, but too much heat can.

Expert Insights From Our Solar Panel Installers About How a Solar Powered Watch Works

Solar-powered watches are a brilliant integration of solar technology into everyday life. They use photovoltaic cells to convert light into electricity, ensuring your watch is always charged and accurate without the hassle of changing batteries.

Senior Solar Installer

One of the most impressive aspects of solar watches is their efficiency. They can charge under both natural and artificial light, making them highly reliable and convenient for users who are always on the go.

Lead Solar Technician

The longevity and eco-friendliness of solar-powered watches make them a superior choice over traditional watches. They significantly reduce waste by eliminating the need for disposable batteries, aligning perfectly with sustainable living practices.

Solar Energy Specialist

Final Thoughts

Everyone should consider making the switch from the traditional quartz watch to solar watches. It is not just a sustainable choice for the environment but also offers long-term savings.

You can charge a photovoltaic solar cell for years to power the watch. Moreover, solar watches have a power reserve that can keep the energy stored for future use.

If you’re still not convinced about all the good that can come from using solar watches, you should check out the Citizen Eco-Drive brand, the Seiko Solar brand, and other manufacturers’ products.