A dead watch battery is most inconvenient when you are traveling, outdoors, or already running late. Solar watches solve that small but persistent problem by turning ambient light into usable energy, though the best models take very different approaches to durability, readability, water resistance, and smart features.
Our Best best solar watches guide includes simple analog field watches, tough digital G-Shocks, a serious dive watch, and a GPS smartwatch with solar charging. The single best pick for most people is the Citizen Garrison AW0050-82E, while the range below covers nearly every reason to choose solar timekeeping.
Comparison table
| # | Product | Award | Movement | Water resistance | Standout feature | Best for |
|---|---|---|---|---|---|---|
| 1 | Citizen Garrison AW0050-82E | Best overall | Eco-Drive analog | 100 meters | Day and date display | Everyday field-watch wear |
| 2 | Casio MTP-S120L Field Watch | Best field watch | Solar analog | 100 meters | NATO strap and day/date | Casual outdoor use |
| 3 | Garmin Instinct 3 Solar | Best solar smartwatch | GPS smartwatch with solar charging | 10 ATM | GPS, health tracking, flashlight | Training and navigation |
| 4 | G-Shock GBM2100A-1A2 | Best connected G-Shock | Tough Solar analog-digital | Not specified | Bluetooth Smartphone Link | Tough daily wear |
| 5 | Casio G-Shock MTGM900DA-8CR | Best atomic timekeeping | Tough Solar digital | 200 meters | Multi-Band 6 atomic time | Water sports and travel |
| 6 | MASTOP Solar Dual-Time Watch | Best dual-time watch | Solar analog-digital | 50 meters | Dual time zones | Basic outdoor routines |
| 7 | NORTH EDGE Triton Solar Dive Watch | Best for diving | Solar quartz analog | 300 meters | Luminous dive-watch dial | Swimming and diving |
1. Citizen Garrison AW0050-82E: Best Overall
Pros
- Eco-Drive runs on natural or artificial light
- Clear Arabic markers and luminous hands
- Useful day and date display
- 100-meter water resistance
- Stainless steel case and bracelet
Cons
- Mineral crystal is less scratch-resistant than sapphire
- The 43mm case wears fairly large
- Lacks the timing and connectivity features of sportier picks
Best for: someone who wants a conventional everyday watch without battery changes.
The Citizen Garrison AW0050-82E2 is the easiest watch here to recommend to someone who wants solar convenience without wearing a gadget. It looks like a familiar field watch, with a black dial, Arabic markers, silver-tone stainless steel construction, and a straightforward three-hand layout. The day and date display adds useful information without making the dial feel busy.
Citizen's Eco-Drive system is the central reason to buy it. The watch is powered by light, including ordinary indoor light, so the owner does not need to plan routine battery swaps. That makes it a particularly good daily watch for someone who wants to put it on, read the time, and forget about the power source. Its 100-meter water resistance also gives it enough protection for swimming and general wet-weather use, though it is not presented as a dedicated dive instrument.
Visibility is strong in the situations that matter for a field watch. The Arabic markers are easy to scan, and the luminous hands and markers help after dark. A mineral crystal protects the dial from everyday knocks, but it is not as resistant to scratching as a higher-end crystal would be. The 43mm case also has a noticeable presence. That size suits larger wrists and readers who like a bold dial, while anyone seeking a compact watch should look closely at the fit before choosing it.
Compared with the Casio MTP-S120L Field Watch, the Citizen feels more like a polished all-purpose watch, while the Casio leans harder into its military-inspired NATO strap and inner 24-hour ring. The Citizen gives up the Garmin Instinct 3 Solar's navigation and health tools, and it lacks the G-Shock watches' shock-focused construction. In return, it is less visually specialized and more at home with office clothes, weekend clothes, and ordinary travel.
The Garrison is the best solar watch for a buyer who wants an analog watch first and a solar watch second. Skip it if you need GPS, atomic synchronization, a stopwatch-heavy digital interface, or a case built specifically around serious water sports.
2. Casio MTP-S120L Field Watch: Best Field Watch
Pros
- Solar operation with about eight months of reserve from a full charge
- 42mm stainless steel case
- NATO-style nylon strap is practical and replaceable
- Day, date, and 24-hour inner bezel
- 100-meter water resistance
Cons
- Push-in crown offers less sealing than a screw-down design
- Mineral glass can pick up scratches
- Nylon strap gives it a distinctly casual look
Best for: people who want a legible solar field watch with an easy-to-change strap.
The Casio MTP-S120L Field Watch has the most purposeful everyday design in this group. Its black dial, luminous hands, day and date window, and 24-hour inner chapter ring all serve the same goal: quick reading without fuss. The NATO-style nylon strap reinforces that field-watch character, and its 22mm lug width makes strap changes straightforward for owners who want to alter the look or replace worn fabric.
The 42mm stainless steel case lands just below the Citizen's 43mm size, though both are firmly in the modern medium-to-large range. Casio pairs it with a solid caseback, fixed bezel, and mineral glass. Those choices are sensible for daily use, but the push-in crown is a reminder that this is an everyday water-resistant watch rather than an instrument for serious underwater work. Its 100-meter rating is suitable for routine swimming and wet conditions.
Solar charging is especially well matched to this watch's simple analog movement. Casio says a full charge can run for approximately eight months without additional light exposure, and its charging system is designed to use faint light from indoor lamps as well as outdoor light. That is the kind of ownership detail that makes a solar watch feel invisible in the best way. You do not need a special charging habit, just regular wear.
The MTP-S120L is more relaxed and strap-friendly than the Citizen Garrison AW0050-82E, but the Citizen has the more broadly dressed-up stainless steel presentation. The G-Shock GBM2100A-1A2 brings Bluetooth connectivity and a tougher visual identity, while this Casio stays slimmer in spirit and easier to read at a glance. Readers drawn to field-watch proportions can also compare the design choices that make a field watch useful every day before settling on a case and strap style.
Its weakness is specialization. The nylon band and military styling will not appeal to someone who wants a dressier bracelet watch, and there is no backlight, GPS, or smartphone integration. Choose it for uncomplicated outdoor wear, especially if replaceable straps and a clear dial matter more than advanced functions.
3. Garmin Instinct 3 Solar: Best Solar Smartwatch
Pros
- Solar charging can support unlimited battery life under stated conditions
- Multi-band GPS with SatIQ
- Built-in variable-intensity LED flashlight
- Health, sleep, heart-rate, and Pulse Ox features
- 10 ATM water rating and MIL-STD-810 design
Cons
- Requires a compatible smartphone for connected features
- Solar performance depends on substantial outdoor exposure
- More complex than a conventional analog watch
Best for: hikers, runners, and active users who need navigation and training data.
The Garmin Instinct 3 Solar is the outlier here because it is not merely a watch that happens to recharge from light. It is a rugged GPS smartwatch built around outdoor activity, navigation, health monitoring, and connected safety features. The 45mm fiber-reinforced polymer case and metal-reinforced bezel give it a tool-like presence, and the built-in LED flashlight is the kind of feature that can be useful far beyond a workout.
Its 0.9-inch display uses a solar charging lens, and Garmin's unlimited battery-life claim assumes all-day wear with three hours per day outside in 50, 000 lux conditions. That qualification matters. The solar system can meaningfully extend operation, but the result depends on how much bright outdoor light the watch actually receives. A desk worker who spends most of the day indoors should not interpret the claim as a guarantee of endless operation in every routine.
The feature set is much deeper than the analog watches here. Multi-band GPS and SatIQ are designed to improve positioning while managing battery use, while the three-axis compass and barometric altimeter make the watch more useful away from roads and landmarks. Wrist-based heart rate, advanced sleep monitoring, and Pulse Ox add health context, though Garmin states that the device is not a medical device. Garmin Pay, smart notifications, Connect IQ compatibility, incident detection, and Assistance expand its usefulness when paired with a smartphone.
This is the clear choice over the Citizen Garrison AW0050-82E or Casio MTP-S120L Field Watch when a watch needs to record activity or guide an outing. The G-Shock GBM2100A-1A2 offers a more traditional watch experience with Bluetooth, but it cannot match the Garmin's navigation and health platform. For readers choosing between a connected watch and a classic one, the deciding question is often how much everyday smartwatch information you actually need.
The Garmin's drawbacks are its size, complexity, and dependence on a phone for several connected safety and notification functions. Incident detection and Assistance also require setup, a paired smartphone, and network coverage. Skip it if you simply want a solar analog watch that can sit quietly on your wrist. Pick it when GPS, training, outdoor navigation, and long operation are the point.
4. G-Shock GBM2100A-1A2: Best Connected G-Shock
Pros
- Tough Solar charging
- Bluetooth Smartphone Link
- Metal-clad octagonal design
- 45mm case with a strong wrist presence
- Bio-based resin band
Cons
- The feature data is limited compared with the Garmin
- Metallic dial styling may reduce immediate legibility
- Water-resistance rating is not specified in the supplied details
Best for: G-Shock fans who want solar power and phone connectivity without a full smartwatch.
The G-Shock GBM2100A-1A2 takes the familiar octagonal G-Shock shape and gives it a more finished metal-clad treatment. The blue metallic vapor deposition dial adds visual interest, while the black bio-based resin band keeps the watch connected to G-Shock's practical, sporty identity. It is a bold piece, not a discreet field watch, and that is exactly why it will appeal to a different buyer than the Citizen or Casio MTP-S120L.
Tough Solar charging keeps the watch independent from routine battery replacement, while Bluetooth Smartphone Link adds a layer of convenience. The supplied details identify the phone connection but do not specify a full list of app functions, so buyers should not expect the Garmin's health, navigation, and safety ecosystem. Think of this as a tough analog-digital watch with a connected assist, not a smartwatch replacement.
At 45mm, it has a substantial case presence similar to the Garmin Instinct 3 Solar. The difference is in the experience: the G-Shock is designed to remain a watch, with a strong visual design and a more limited information load, while the Garmin is designed to become an outdoor computer on the wrist. The resin band should suit active daily wear, but the metal-clad look makes the GBM2100A-1A2 more adaptable to casual evening clothes than a purely utilitarian digital G-Shock.
The blue dial is the watch's most distinctive trait and also its main compromise. Metallic finishes can be less immediately calm to read than the high-contrast markers on the Citizen Garrison AW0050-82E, and the product information supplied here does not state a water-resistance figure. That omission does not tell us the watch is unsuitable for water, but it means buyers should verify the manufacturer's rating before treating it as a swim watch.
The GBM2100A-1A2 is a strong middle ground between a classic solar watch and a connected wearable. Choose it over the Casio G-Shock MTGM900DA-8CR if Bluetooth matters more than atomic timekeeping and extensive digital timers. Skip it if you want detailed training data or the clearest possible plain-time display.
5. Casio G-Shock MTGM900DA-8CR: Best Atomic Timekeeping
Pros
- Tough Solar power
- Multi-Band 6 atomic timekeeping
- 200-meter water resistance
- World time across 48 cities and 31 time zones
- EL backlight with afterglow
Cons
- Digital styling is less versatile than the Citizen's analog design
- Multiple functions take time to learn
- The supplied dimensions are not useful for judging wrist fit
Best for: travelers and active users who want highly accurate digital timekeeping.
The Casio G-Shock MTGM900DA-8CR is built around reliability rather than decoration. Its stainless steel band, shock-resistant resin and stainless steel case, and digital display make it feel ready for rough daily use. The one-touch three-fold clasp is a practical detail, and the 200-meter water resistance gives this model more underwater headroom than the Citizen, MTP-S120L, or MASTOP.
Its signature feature is Multi-Band 6 atomic timekeeping. The watch can receive radio signals from six calibration sources worldwide, helping keep the displayed time accurate without requiring manual corrections. That makes it especially appealing to frequent travelers and anyone who dislikes adjusting a watch after a time-zone change. World time covers 48 cities across 31 time zones, so the travel tools are more developed than the simple dual-time display on the MASTOP.
The digital platform also includes a 1/100-second stopwatch, a 24-hour countdown timer, multiple daily alarms, a snooze alarm, and 12-hour or 24-hour formats. The full-auto EL backlight with afterglow helps make those functions usable in dim conditions. Power saving can switch off the display in darkness, and the stated reserve from a full charge is approximately nine months without more light. Those are meaningful advantages for a watch intended to be worn hard and left alone.
Compared with the G-Shock GBM2100A-1A2, this Casio is less fashion-oriented and more function-led. It does not offer the GBM2100A's Bluetooth Smartphone Link, but its atomic synchronization, world time, timers, and 200-meter rating are stronger reasons to choose it for travel or water sports. The NORTH EDGE Triton Solar Dive Watch has a much deeper stated water-resistance rating, though the Casio offers a richer timekeeping system.
The main limitation is the digital G-Shock format. It is not as easy to dress up as the Citizen, and the many modes can feel excessive if you only need the time and date. Choose the MTGM900DA-8CR when accuracy, alarms, timing, and water resistance matter more than a traditional analog dial.
6. MASTOP Solar Dual-Time Watch: Best Dual-Time Watch
Pros
- Solar analog-digital movement
- Dual time zones
- LED backlight and full calendar
- Stopwatch and alarm functions
- Lightweight silicone band
Cons
- 50mm case is very large
- 50-meter water resistance is limited for serious water activity
- Tactical styling is not subtle
Best for: buyers who want basic digital functions and two time zones in one large watch.
The MASTOP Solar Dual-Time Watch is unapologetically large and sporty. Its 50mm case, silicone band, analog hands, and digital screen create a tactical look that will suit people who prefer oversized outdoor watches. The dual-display layout is practical, since the analog hands provide an immediate time read while the digital section handles the extra information.
This is the most useful pick here for someone who regularly needs two time zones without moving into a connected smartwatch. The watch also includes a full calendar, stopwatch, alarm, and LED backlight. Those functions give it more flexibility than the basic Citizen and Casio analog models, though the interface is not described with the same depth as the G-Shock digital models.
The case size is both the attraction and the warning. At 50mm, it has a much larger presence than the 42mm MTP-S120L, 43mm Citizen, and 45mm Garmin or GBM2100A. The supplied weight is about 0.15 pounds, which keeps the watch from feeling overly heavy on the wrist, but a light watch can still wear very large. Anyone with a smaller wrist should be especially cautious about the fit.
Its 50-meter water resistance is suitable for rain, sweat, hand washing, and ordinary daily exposure, but it is not the right level for diving or serious water sports. That is where the NORTH EDGE Triton Solar Dive Watch is the more appropriate choice, while the Casio G-Shock MTGM900DA-8CR offers stronger water resistance and more sophisticated travel timing. Readers focused on display readability can also consider which digital watch features matter outside the gym.
The MASTOP's weakness is not a missing feature so much as a lack of restraint. The 50mm case and tactical design will dominate an outfit, and the modest water rating limits its adventure credentials. Pick it when dual time, a backlight, and an oversized analog-digital format are the priorities.
7. NORTH EDGE Triton Solar Dive Watch: Best for Diving
Pros
- Solar quartz movement
- 300-meter water resistance
- Luminous hands and markers
- Mineral glass and durable case
- Silicone strap for sports use
Cons
- Basic feature set compared with the G-Shock models
- Dive styling is less versatile for formal wear
- The supplied data does not specify case diameter
Best for: swimmers, snorkelers, and divers who prioritize water resistance.
The NORTH EDGE Triton Solar Dive Watch makes one priority clear: water resistance. Its 300-meter rating is the deepest stated rating in this group, placing it well ahead of the Citizen, Casio MTP-S120L, Garmin, and MASTOP on paper for swimming, snorkeling, diving, and other water sports. The blue silicone strap supports that active role and should be comfortable when the watch is used outdoors.
The analog dial keeps the watch familiar. Luminous hands and markers improve visibility in low light, which is essential for a dive-style watch and useful at night on land. Mineral glass protects the face against ordinary impacts, while the durable case is intended for outdoor and everyday wear. The supplied data does not give a case diameter, so buyers who care about wrist proportions will need to confirm that detail before ordering.
The solar quartz movement is simple by design. It reduces the need for frequent battery replacement, but the watch does not promise the Garmin's navigation, health tracking, or connected safety features. It also does not list the G-Shock MTGM900DA-8CR's atomic timekeeping, alarms, world time, or stopwatch package. The Triton is about a tough, readable timepiece that can go into the water.
That focus makes it a better match for diving than the MASTOP Solar Dual-Time Watch, despite the MASTOP's extra digital functions. The Casio G-Shock has a more complete timing toolkit, and the Garmin is better for land-based route tracking, but the Triton's stated 300-meter resistance gives it the clearest underwater advantage. For people comparing styles as well as function, how a watch balances outdoor toughness with everyday wear is a useful question to settle.
The compromise is versatility. A dive watch can look out of place with formal clothing, and the feature set is basic beside the digital G-Shocks. Choose the Triton when water sports are central to your routine and choose another model when navigation, travel timing, or a quieter everyday design matters more.
How to choose best solar watches
Solar watches differ less in the basic idea of charging from light than in what they ask that energy to run. Start with the movement, then match the case, display, and water protection to the way you will actually wear the watch.
Solar charging system
A solar analog movement usually has a simpler energy demand than a GPS smartwatch, so it can spend long periods operating without direct sunlight. The Casio MTP-S120L states approximately eight months of operation from a full charge, while the Garmin's unlimited battery-life claim depends on three hours per day outside in 50, 000 lux conditions.
Indoor light can keep some watches charged, but bright outdoor exposure is more useful for high-demand devices. Treat solar charging as a maintenance reduction, not a reason to ignore the watch completely.
Display and readability
Analog field watches such as the Citizen and Casio MTP-S120L are quick to read because the dial stays focused on the time. Luminous hands and markers help after dark, while digital models add backlights that are more useful for alarms, timers, and secondary information.
A busy analog-digital display can be more capable but slower to interpret. Look for high-contrast markers if fast reading matters more than a long feature list.
The right solar watch is the one whose power system matches its feature load, not simply the one with the biggest solar claim.
Water resistance
Water resistance should match the activity, not the marketing language. The Citizen and Casio MTP-S120L are rated to 100 meters, the Garmin to 10 ATM, the Casio G-Shock MTGM900DA-8CR to 200 meters, the MASTOP to 50 meters, and the NORTH EDGE Triton to 300 meters.
For rain and daily wear, a modest rating may be enough. Swimming, snorkeling, and diving call for a watch specifically presented for those activities, with the Triton offering the strongest stated rating in this group.
Case size and strap
The watches here range from conventional field-watch proportions to the MASTOP's very large 50mm case. Case size affects both comfort and how quickly the dial can be read, while strap material changes the character of the watch. Stainless steel feels more finished, nylon is flexible and replaceable, and silicone suits wet or active use.
Check the case diameter and lug width against your wrist rather than choosing by appearance alone. The Casio MTP-S120L's 22mm lug width is particularly useful for owners who want to experiment with replacement straps.
Connected and timing features
A basic solar watch may only need to show the time, date, and day. The G-Shock MTGM900DA-8CR adds atomic synchronization, world time, alarms, a stopwatch, and a countdown timer. The Garmin goes much further with GPS, a compass, an altimeter, health tracking, notifications, payments, and safety tools.
Choose connected features only when you will use them. They make the Garmin far more capable outdoors, but they also require more setup and, for several functions, a compatible smartphone.
Frequently asked questions
Do solar watches need direct sunlight?
No. The Citizen Eco-Drive and Casio MTP-S120L are described as charging from ordinary ambient light, including indoor light. Bright outdoor light charges a watch more effectively, especially a feature-heavy smartwatch such as the Garmin Instinct 3 Solar.
How long can a solar watch run without light?
The answer depends on the model and its stored charge. Casio states approximately eight months for the MTP-S120L and approximately nine months for the MTGM900DA-8CR from a full charge without further light exposure. Garmin's solar performance is described differently because its unlimited battery-life claim assumes regular bright outdoor exposure.
Which watch is best for swimming or diving?
The NORTH EDGE Triton has the strongest stated water resistance at 300 meters and is specifically described for swimming, snorkeling, diving, and water sports. The Casio G-Shock MTGM900DA-8CR is rated to 200 meters and is also a strong water-oriented option, while the 50-meter MASTOP is better limited to everyday wet conditions.
Are solar watches accurate?
Solar charging describes how the watch is powered, not how it keeps time. The Casio G-Shock MTGM900DA-8CR has Multi-Band 6 atomic timekeeping for radio-controlled accuracy, while the other watches use their listed analog, digital, quartz, or smartwatch systems.
Can a solar watch stay charged indoors?
Some can maintain operation with indoor light, though charging is slower than it is in strong daylight. The Casio MTP-S120L specifically describes its system as converting faint light from fluorescent lamps into energy. A smartwatch with GPS and other high-demand functions may need more consistent outdoor exposure.
Are solar smartwatches different from solar analog watches?
Yes. A solar analog watch generally uses light to power a simple timekeeping movement and can operate quietly for long periods. A solar smartwatch also powers a display, sensors, GPS, wireless connections, and software, so its battery behavior depends heavily on how those features are used.
Which solar watch is easiest to maintain?
The Citizen Garrison AW0050-82E and Casio MTP-S120L are the simplest choices because they combine solar charging with straightforward analog displays. The Garmin needs smartphone pairing and app setup for many of its advanced features, while the G-Shock models require learning their digital or connected functions.
The bottom line
The Best best solar watches pick for most people is the Citizen Garrison AW0050-82E. Its Eco-Drive movement, legible field-watch dial, day and date display, luminous markers, stainless steel construction, and 100-meter water resistance cover everyday wear without turning the watch into a project.
Choose the Garmin Instinct 3 Solar if GPS, health tracking, training, navigation, and outdoor safety are central to your routine. For serious water use, the NORTH EDGE Triton Solar Dive Watch has the strongest stated water-resistance rating, while the Casio G-Shock MTGM900DA-8CR is the better travel tool for atomic timekeeping, alarms, and world time.
If you are undecided, choose the Citizen for ordinary daily wear, the Garmin for active navigation, and the Triton only when water resistance is the deciding factor.
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