The Game-Changer: Solar Charging Smartwatches
- Subir Biswas
- Jul 5
- 7 min read
Updated: Nov 19
What Is a Solar Charging Smartwatch?
Have you heard of solar charging smartwatches? They’re innovative devices with photovoltaic cells built into their design. These cells act like tiny solar panels, capturing and converting sunlight—and sometimes even artificial light—into energy. This technology is revolutionary because it means the smartwatch can charge itself using the light around it. You won’t have to worry about plugging it in all the time. The extra energy from the sun helps keep the battery charged, so you don’t have to stress about running out of power. This is a fantastic option for people who are always on their phones or who live in areas without easy access to power sources.
Popular models like the Garmin Fenix 7 Solar and Casio G-Shock GBD-H2000 use transparent solar panels or solar-assisted systems to keep the watch powered even in remote environments.
How It Works
Solar smartwatches use photovoltaic cells to convert light into electricity. This process is regulated by a power management system. Most models also support USB or wireless charging.
Photovoltaic Cells
Solar cells, or photovoltaic cells, are crucial in renewable energy. They convert sunlight into electricity through the photovoltaic effect. In this process, light photons excite electrons, creating an electric current. Silicon is commonly used in these cells, which come in various configurations, each with its own efficiency and cost. Advancements in technology have improved solar cell efficiency, leading to better energy conversion rates and performance in various environments. As a result, solar cells are increasingly integrated into applications, from large solar farms to small-scale rooftop installations, contributing to a more sustainable energy future.
Power Management System
The sophisticated power management system in solar energy applications optimises the capture, storage, and utilisation of solar energy. It ensures efficient harnessing of photovoltaic cell energy. Components include charge controllers, inverters, and batteries. Charge controllers regulate battery charging, preventing overcharging and extending battery life. Inverters convert DC from solar panels to AC, the common electricity form used in homes and businesses. Advanced systems can monitor energy consumption patterns and make dynamic adjustments to maximise efficiency and ensure energy availability. This system enhances solar energy performance and contributes to a reliable and sustainable energy supply.
Hybrid Charging
Hybrid charging technology in solar smartwatches offers multiple charging options, extending battery life and reducing the need for traditional charging. While primarily relying on solar energy, these devices also support USB charging for quick recharges using standard power sources. Many models also offer wireless charging for a cable-free experience. This dual approach ensures users can recharge their devices efficiently, regardless of sunlight availability. Hybrid charging systems in solar smartwatches cater to various lifestyles and environments, providing flexibility and reliability for users on the go.
Key Benefits
Solar input extends battery life, making it eco-friendly and ideal for outdoor use. It requires low maintenance due to less frequent charging.
Extended Battery Life
Solar input technology in portable devices significantly extends their runtime. This eliminates the need for constant power sources. Under optimal sunlight conditions, devices can gain several extra hours, sometimes even days, of operational time. This is particularly useful for remote users with limited or no access to electricity. For instance, solar-powered devices can remain functional during camping trips, ensuring continuous use throughout the night and into the next day. This enhances convenience and the overall experience for users who rely on their devices for outdoor activities like navigation, communication, and entertainment.
Eco-Friendly
Solar technology offers significant environmental benefits. By reducing reliance on grid electricity, it decreases carbon emissions from traditional energy production. Additionally, solar devices minimise the need for disposable batteries, which pollute landfills. Choosing solar energy supports sustainable practices and reduces ecological footprints. This shift towards renewable energy sources is crucial in combating climate change by promoting a sustainable lifestyle and clean energy alternatives. Adopting solar technology benefits individuals and contributes to a larger movement towards environmental responsibility and conservation.
Ideal for Outdoor Use
Solar-powered devices are ideal for outdoor enthusiasts like hikers, athletes, and adventurers who often venture far from conventional power sources. They allow these individuals to stay connected, informed, and entertained during their excursions. Whether it’s using a solar charger for navigation and emergency communication or powering a portable speaker for entertainment, solar technology enhances the outdoor experience. Many solar devices are lightweight and portable, making them easy to carry in backpacks without adding significant weight. This convenience allows adventurers to focus on their activities rather than worrying about battery life, enriching their time in nature.
Low Maintenance
Solar-powered devices offer low maintenance, reducing the need for frequent charging and minimising wear and tear on ports and cables. This is especially beneficial for those on the go, as it reduces the risk of damage from regular charging. Solar devices are also more durable than traditional counterparts, engineered to withstand outdoor conditions and active use. This low maintenance saves time and effort, extending the lifespan of the equipment and ensuring reliable performance. In summary, solar technology is an optimal choice for optimising device usage while minimising maintenance concerns.
Popular Models
Model Name | Battery Life | Key Features | Best Use Case | Highlight Feature |
Up to 22 days (smartwatch mode with solar) | GPS, TOPO maps, heart rate, SpO2, sleep tracking, hydration tracking, NFC | Outdoor adventurers, athletes, long-distance travellers | Rugged design with advanced fitness and navigation features | |
Up to 37 days (smartwatch mode with solar) | 1.4 display, built-in LED flashlight, TOPO maps, GPS, ABC sensors | Extended expeditions, max endurance users | Larger screen and flashlight for extreme environments | |
Unlimited (with sufficient solar exposure) | VO2 max, SpO2, heart rate, stress tracking, multi-satellite navigation | Budget-conscious outdoor users | Rugged build and excellent value for money | |
Up to 54 days (battery saver mode) | ABC sensors, solar intensity widget, heart rate, sleep tracking | Entry-level outdoor enthusiasts | Affordable and durable with essential features | |
Solar-assisted with USB charging backup | 6 sensors (heart rate, accelerometer, gyroscope, etc.), GPS, 200m water resistance | Fitness-focused users wanting durability | G-Shock toughness with modern smart features |
Challenges
Solar charging has limitations, including reduced effectiveness in low light and higher costs.
Limited Power Output
Solar charging, a significant advancement in renewable energy, often struggles to meet the demands of modern devices. This is especially true for those requiring continuous power for features like GPS navigation or LTE connectivity. These features consume a lot of energy, especially during prolonged use. For example, GPS systems need a constant satellite connection for accurate location tracking, which can quickly drain battery life. Similarly, LTE capabilities require a robust power supply for high-speed data transmission, especially in areas with weak signal strength. As a result, solar-powered devices may experience interruptions or reduced performance in these high-demand scenarios. Users may need to consider alternative power sources or supplementary batteries for optimal functionality.
Dependence on Light Exposure
Solar-powered devices rely heavily on light exposure for efficient operation. In indoor environments with scarce sunlight or low-light conditions like overcast weather, their effectiveness decreases. This leads to longer charging times or insufficient energy generation. A dimly lit room may struggle to gather energy, causing reduced performance or shutdown. Users must place solar devices in well-lit areas to maximise energy absorption. This dependence on optimal light conditions limits the practicality of solar technology in environments with inconsistent sunlight exposure.
Cost
Solar-powered models are more expensive than conventional ones. This is because they use advanced solar technology and materials to efficiently harness solar energy. The manufacturing process for solar panels requires specialised components and intricate engineering, which increases production costs. Integrating solar technology also requires design and functionality enhancements, further contributing to the cost. Consumers may pay a premium for the convenience and sustainability of solar-powered devices. While the long-term savings on energy costs and environmental benefits are significant, the initial financial outlay can be a barrier for many potential users. Consumers should consider the long-term benefits against the upfront costs when purchasing solar-powered technology.
The Future of Solar Wearables
As solar cell technology improves and smartwatch power consumption decreases, we’re moving closer to fully solar-powered wearables. The integration of solar technology in smartwatches not only improves convenience for users but also promotes sustainability by reducing the overall energy consumption associated with frequent battery charging. As these devices continue to evolve, manufacturers are likely to explore even more efficient solar technologies and innovative designs that further enhance the performance and longevity of solar charging smartwatches. This trend reflects a growing awareness of environmental concerns and the importance of creating devices that are not only functional but also contribute to a more sustainable future. Expect innovations like flexible solar panels, AI-powered energy management, and self-sustaining smartwatches that rarely need plugging in.
Final Thoughts
A solar charging smartwatch is more than just a gadget—it’s a reliable companion for those who value endurance, sustainability, and smart functionality. Whether you're scaling mountains, training for a marathon, or simply avoiding daily charging, solar-powered wearables offer a bright solution.
FAQ
What features should I prioritise in a solar smartwatch?
When choosing a solar smartwatch, the best features to prioritise depend on your lifestyle and intended use. However, here are the key features that generally matter most:
Look for models with transparent solar panels (like Garmin’s Power Glass™).
Check how much battery life is extended with solar exposure.
Some models offer unlimited battery life in smartwatch mode with sufficient sunlight.
Navigation & Outdoor Tools
GPS / GLONASS / Galileo support for accurate tracking.
ABC sensors (Altimeter, Barometer, Compass) for hiking and trekking.
TOPO maps or breadcrumb navigation for off-grid adventures.
Health Monitoring
Heart rate monitoring.
SpO2 (blood oxygen) sensor.
VO2 max, stress tracking, sleep analysis.
Activity profiles for running, cycling, swimming, etc.
Durability
MIL-STD-810G certification for shock, heat, and water resistance.
Water resistance of at least 100 meters (10 ATM) for swimming and rain.
Smart Features
Notifications (calls, messages, apps).
Music control or storage.
NFC payments (e.g., Garmin Pay).
Custom watch faces and widgets.
Connectivity
Bluetooth, Wi-Fi, and ANT+ support.
Compatibility with iOS and Android.
Sync with fitness platforms like Strava, Garmin Connect, or Google Fit.
Display
Always-on display with good sunlight visibility.
Touchscreen + physical buttons for versatility.
Customisable widgets and data screens.
Ideal Use Case Matching
Use Case | Recommended Features |
Hiking & Trekking | Solar + GPS + ABC sensors + long battery life |
Fitness & Training | VO2 max + heart rate + activity profiles + durability |
Everyday Use | Notifications + NFC + stylish design + moderate solar assist |
Travel & Expeditions | Offline maps + solar + multi-GNSS + rugged build |
