How Does a Solar Watch Work?

A solar watch is becoming a trend because of its many benefits. From reliability to sustainability, a solar watch is one of the technological advancements that has changed the course of human living. You may wonder how? Using a solar watch reduces the number of biodegradable batteries and thus a safer and greener environment. But that’s a story for another day. This article aims to provide detailed information about how a solar watch works—knowing how a solar watch works will help you make better decisions in buying and maintaining a solar watch to last a lifetime. 

So let’s jump right in and see how exactly a solar watch works because you will agree that a solar watch works differently from a Quartz watch. Otherwise, there will be no difference between the two. 

Quick Answer

A Solar Watch is a timepiece that operates by converting light energy into electrical energy. The watch incorporates a solar cell unit beneath the dial that absorbs light energy, which is then transformed into electrical energy. This energy is stored in a rechargeable battery and utilized to power the watch’s movement mechanism.

How does solar watch technology work?

A solar watch is also called a photoelectric watch, and in simple terms, a solar watch is powered by solar energy.

But let’s dig deeper beyond the simple definition to unravel the science behind a solar watch.

The technical mechanism of a solar watch is relatively simple and consists of the following components:

  1. Solar panel – A small photovoltaic (PV) solar panel is integrated into the watch face. The solar panel converts light from the sun or other light sources into electrical energy.
  2. Rechargeable battery – A rechargeable battery is used to store the electrical energy generated by the solar panel. The battery is usually a lithium-ion battery that can hold a charge for a long time.
  3. Control circuit – The control circuit manages the flow of electricity between the solar panel and the rechargeable battery. It also controls the functions of the watch, such as the display and the hands.
  4. Quartz crystal oscillator – The quartz crystal oscillator is a small, vibrating crystal that keeps time with high accuracy. The control circuit uses the oscillator to regulate the movement of the watch hands.
  5. Display – The display shows the time and other information, such as the date and any alarms or timers that have been set. The display can be either analog or digital.

When the solar panel is exposed to light, it generates electrical energy that is used to recharge the battery. The control circuit then uses this energy to power the watch and its functions. If the watch is not exposed to light for a prolonged period, the rechargeable battery will provide power to the watch until it can be recharged by the solar panel again.

Do solar powered watches have batteries?

As earlier mentioned, a solar watch uses a battery to function, but not the typical dry or button battery in Quartz watches. A solar watch uses a rechargeable, eco-friendly battery that can dispel and store energy for a long time. The solar watch batteries are often in the form of a lithium-ion cell that can be recharged a thousand times before needing replacement.

A solar watch battery is strong and durable. A single solar watch battery full charge can last months. And the best part is that a solar watch battery can be used for you for 15 years if properly maintained. The downside is that a solar watch battery will begin to suffer degradation and corrosion over time. Regardless, a solar watch battery has proven highly effective and efficient compared to Quartz watch batteries. 

Do solar watch-powered batteries work at night?

Contrary to popular beliefs that a solar watch battery can only be powered by solar energy, any artificial light can power up a solar watch battery. The solar cells in a solar watch can slowly fill up under a bright artificial light with enough intensity. So, if such a light is available at night, it can power up your solar watch battery. Although, the charging speed will be lesser compared to the charging speed where there’s active sunlight.

Nevertheless, make sure to consult with the solar watch Manufacturer’s guide to have an idea about the lightning conditions needed for sufficient charging. While some solar watch models will charge sufficiently under artificial light, others will not. So it’s necessary you go through the Manufacturer’s guide and understand how a particular solar watch model works.

Are solar watches reliable?

Sometimes, solar watches are also called solar quartz watches. Why? Solar watches operate the same way as quartz watches concerning other features. There’s a vibrating quartz crystal in a solar watch as there is in a Quartz watch. The vibrating quartz crystal ensures a beat rate of one tick per second and accurate timekeeping. So it makes sense to call a solar watch a solar quartz watch.

So back to the question, if solar watches are reliable more than you think. First, a solar watch is Manufactured by the most trusted watch Manufacturers. Think of it this way. It’s pretty easy for anyone to manufacture a quartz watch and sell it to the public. And that’s why there are tons of unknown brands releasing quartz watches daily. But it is not the same with producing a solar watch. Due to the special eco-drive technology Involve in manufacturing a solar watch, watch manufacturers think twice before venturing into the production of solar watches. So when you buy a solar watch, you can be sure of its quality.

Also, because there’s constant charging in a solar watch, there are reduced risks of a change or drop-in time, which is common when replacing batteries in a quartz watch. Since a solar watch battery can last up to 10 years, it means accurate timekeeping for 10 years. This is something you will rarely see in a quartz watch. Without mincing words, a solar watch is more reliable than you can imagine. Above all, they are effective. Below is a compiled list of the features of a solar watch.

The features of a solar watch

Depending on the model and the Manufacturer, solar watch features vary with one another. Some solar watch has multiple time zone displays and even a stopwatch, while others do not. However, this section will focus on the necessary and standard features of a solar watch. These are features a solar watch contains irrespective of its cost, model, or Manufacturer. 

Dial: The dial is the displaying portion of a solar watch. Sometimes, it is called the face. Solar watches have different dial colors and shapes. It buzzes down to your preferences and personality. However, it’s great to go for solar watches with bold dials, so it’s easy for you to read the time. You can also consider light-colored dials if you are battling eye problems. You will find varieties of solar watches with beautiful faces out there. Make sure to find the best one for you.

Note: Sometimes, there’s a subdial inside the main dial responsible for giving details that are not provided by the main dial. The details include seconds reading and dates reading. 

Crystal: There’s a transparent covering on the face of a solar watch called the Crystal. The Crystal protects the solar watch dial from water and dirt. The majority of the solar watch has a crystal regardless of its brands. But the Crystal quality varies with the quality of the solar watch. Stay away from low-quality crystals as they would increase the risk of your Solar watch having a glare. 

Hand: A solar watch and a quartz watch have a hand feature that indicates time on the dial. The hand feature comes in at least 3 parts, the hour hand, the minute hand, and the second hand. 

Case: A solar watch has a case that houses its dial and movement. The protective case safeguards the elements against wear and tear. Like the dial, there are varying case sizes and shapes in a solar watch. There’s an attachment to the case that controls other functions like date adjustment or chronograph. The attachment is called a pusher. But that’s not all. Some luxury solar watches have a barometer, a thermometer, and a chronograph to increase their functionality. 

Here’s a table comparing the features of a solar watch and a traditional watch:

FeatureSolar WatchTraditional Watch
Power SourceSolar panel converts light into electrical energy to power the watchBattery or winding mechanism powers the watch
MaintenanceMinimal maintenance needed as the battery can last for years and can be recharged by exposure to lightBattery needs to be replaced every few years, and the watch may require periodic servicing
Environmental ImpactEnvironmentally-friendly as it uses renewable energy from the sunBattery-powered watches require replacement batteries, which can end up in landfills and harm the environment
AccuracyHigh accuracy as it uses quartz crystal oscillator technologyHigh accuracy as it also uses quartz crystal oscillator technology
DurabilityDurability can vary depending on the model, but many solar watches are designed to be rugged and water-resistantDurability can vary depending on the model, but many traditional watches are not designed to be as rugged or water-resistant as solar watches
StyleComes in a variety of styles, from sporty to dressyComes in a variety of styles, from sporty to dressy
PriceCan be more expensive than traditional watches, but prices vary depending on the brand and featuresCan range in price from very affordable to extremely expensive, depending on the brand and features

How do you know when a solar watch battery is full?

Often, solar watches have an indicator that tells you their charge level. This functionality will help you know when the charge level of a solar watch is low or high. In some models, the charge level indicator is a part of the solar watch display, and in others, it could be associated with the second hand. To identify the battery level indicator in your solar watch, consult the Manufacturer’s manual because the location of the charge level indicator may vary with the model.


If the purpose of a thing is not known, abuse is inevitable. We don’t want you going about abusing your investment; in a solar watch, instead of enjoying all the benefits it has to offer. We hope this article has given you a better understanding of how a solar watch works and the answers to possible questions troubling you. In this age, technology is an investment, so consider a solar watch a good investment. Don’t fret, you don’t have to break the bank to get a good solar watch. There are many quality solar watches at affordable price.

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