Garmin · 2024
fēnix® 8 – 51 mm, SolarSize, Dimensions & Wrist Fit
Case Width
51mm
Thickness
15.4mm
Diameter
51mm
Weight
95g
The Garmin fēnix® 8 – 51 mm, Solar sits best on flat wrist widths of about 54–73mm (≈ 14.4–19.5cm wrist circumference). Adjust the slider below to check your wrist.
Does the fēnix® 8 – 51 mm, Solar fit your wrist?
Drag the slider to your wrist width and see the fēnix® 8 – 51 mm, Solar overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.
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Garmin fēnix® 8 – 51 mm, Solar Full Specifications
Overview1
FamilyGarmin
General15
Battery life
Smartwatch: Up to 30 days/48 days with solar*
Battery Saver Watch Mode: Up to 48 days/107 days with solar*
GPS Only: Up to 95 hours/149 hours with solar**
All Satellite Systems: Up to 68 hours/92 hours with solar**
All Satellite Systems + Multi-band: Up to 52 hours/65 hours with solar***
All Satellite Systems + Music: Up to 18 hours
Max Battery GPS: Up to 186 hours/653 hours with solar**
Expedition GPS: Up to 50 days/118 days with solar*
*Solar charging, assuming all-day wear with 3 hours per day outside in 50,000 lux conditions
**Solar charging, assuming use in 50,000 lux conditions
***Solar charging, assuming use in 50,000 lux conditions; assuming typical use with SatIQ technology
Battery typeLithium ion
Display Size1.4” (35.56 mm) diameter
Case materialfiber-reinforced polymer with metal rear cover
Color displayYes
Lens MaterialPower Sapphire™
Bezel Materialtitanium
Memory/History32 GB
Strap materialsilicone
Charging methodGarmin proprietary plug charger
Large font optionYes
Display resolution280 x 280 pixels
Built-in speaker/microphoneYes
Leakproof inductive buttonsYes
QuickFit® watch band compatibleincluded (26 mm)
Sensors15
GPSYes
QZSSYes
BeiDouYes
CompassYes
GLONASSYes
GalileoYes
GyroscopeYes
ThermometerYes
Depth sensoryes (to 40 m)
AccelerometerYes
SatIQ™ TechnologyYes
Ambient light sensorYes
Barometric altimeterYes
Pulse Ox Blood Oxygen Saturation MonitorYes
Garmin Elevate™ wrist heart rate monitorYes
Product Info5
Main SKU010-02907-20
Product ID1390829
Product Namefēnix® 8 – 51 mm, Solar
Release Date8/27/2024
Product Variation
Sapphire, Titanium with Amp Yellow/Graphite Silicone Band
Clock Features7
TimerYes
StopwatchYes
Time/dateYes
Alarm clockYes
GPS Time SyncYes
Sunrise/sunset timesYes
Automatic daylight saving timeYes
Diving Features24
PO2up to 1.6 with customizable Deco settings
TidesYes
Backlightyes (configurable intensity; always on)
Gas mixesAir, Nitrox (21-40% Oxygen)
APNEA modeYes
Deep Stopsyes (using custom Gradient Factors)
No fly timeYes
Safety Stopyes (customizable off/3min/5min)
Dive planneryes (Basic NDL & Gas Planner)
Nitrox supportYes
Alerts & alarmsyes (vibration only)
Single-gas modeYes
3-axis dive compass
yes with adjustable heading, quick change to 90R, 90L, and Reciprocal. Indicates degrees and direction back to set heading.
Auto start/end diveYes
Decompression modelBühlmann ZHL-16c with Gradient Factors
Missed Deco Lockout
yes (can be disabled prior to dive with user acknowledgement)
Custom end-dive timeoutyes (20 sec to 10 min)
Customizable conservatismyes (Low/Medium/High)
Surface diver status widget
yes (Surface Interval, no fly time, N2 loading, CNS, OTU, and Tissue Compartment status)
Automatic altitude adjustmentYes
Dive ascent/descent rate indicatorYes
Dive activity maximum operating depth40 meters
Sync dive log to Garmin Dive™ Mobile appYes
Automatically saves dive entry and exit locationsYes
Boating Features1
Wearable trolling motor remoteYes
Cycling Features17
CoursesYes
Power guideYes
MTB Grit & FlowYes
Race an activityYes
Power meter compatibleYes
Advanced cycling dynamicsYes
Power curve and % FTP workoutsYes
Compatible with Varia™ lightsYes
FTP (Functional Threshold Power)yes (with compatible accessory)
Compatible with Varia headlight cameraYes
Speed and cadence sensor support (w/sensor)Yes
Cycle Map (routable cycling-specific street map)Yes
Bike lap and lap maximum power (with power sensor)Yes
Compatible with Varia™ radar (rear-facing radar)Yes
Compatible with Vector™ and Rally™ (power meters)Yes
Compatible with Varia Vision™ (head-mounted display)Yes
Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)Yes
Golfing Features25
PinPointerYes
Swing TempoYes
Custom targetsYes
Tempo TrainingYes
Virtual caddieYes
Full vector mapYes
Handicap scoringYes
Tournament legalYes
Digital scorecardYes
Garmin AutoShot™Yes
PlaysLike distanceYes
Round timer/odometerYes
Auto CourseView updatesYes
Yardage to layups/doglegsYes
Hazards and course targetsYes
Pairs with Garmin Golf appYes
Green View with manual pin positionYes
Preloaded with 43,000 courses worldwideYes
Green Contours (with Garmin Golf membership)Yes
CT10 Automatic club tracking compatible (requires accessory)Yes
Yardage to F/M/B (distance to front, middle and back of green)Yes
Stat tracking (strokes, putts per round, greens and fairways hit)Yes
Wind speed and direction (requires connection to Garmin Golf app)Yes
Touch-targeting (touch target on display to see the distance to any point)Yes
Measures shot distance (calculates exact yardage for shots from anywhere on course)automatic
Running Features18
Hill scoreYes
Run workoutsYes
Running powerYes
Race predictorYes
Foot pod capableYes
Running dynamicsYes
Lactate thresholdyes (with compatible accessory)
Grade-adjusted paceYes
Trail run auto climbYes
Performance conditionYes
Run/Walk/Stand detectionYes
Stride length (real time)Yes
PacePro™ Pacing StrategiesYes
Vertical oscillation and ratioYes
Ground contact time and balanceyes (GCT balance with accessory)
GPS-based distance, time and paceYes
Course- and weather-specific race predictorYes
Cadence (provides real-time number of steps per minute)Yes
What You'll Love16
TouchscreenYes
Display type
Sunlight-visible, transflective memory-in-pixel (MIP)
Water rating10 ATM
Garmin Pay™Yes
Music storageYes
Garmin ECG AppYes
LED flashlightYes
Multi-band GPSYes
Solar ChargingYes
Training statusYes
Built-in mappingYes
Training readinessYes
Pulse Ox blood oxygenYes
Sleep score and insightsYes
Battery life (smartwatch mode)Up to 30 days (48 days with solar)
Make calls and send texts via voiceYes
Activity Profiles16
Gym
Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Jump Roping
DiveScuba Diving (single gas), Apnea Diving, Depth App
SwimPool Swimming, Open Water Swimming
Cycling
Biking, Road Biking, Mountain Biking, Gravel Biking, Bike Commuting, Bike Touring, eBiking, eMountain Biking, Indoor Biking, Cyclocross, BMX
WellnessWalking, Indoor Walking, Pilates, Yoga
MultisportSwimming/Running, Triathlon
In the ringBoxing, Mixed Martial Arts
Team sports
Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball
Motor sports
Motorcycling, Overlanding, Motocrossing, ATVing, Snowmobiling
On the Water
Stand Up Paddleboarding, Rowing, Kayaking, Surfing, Kiteboarding, Windsurfing, Fishing, Boating, Sailing, Water Skiing, Wakeboarding, Wakesurfing, Tubing, Snorkeling, Whitewater
Racket sports
Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball
Snow & winter
Skiing, Snowboarding, Backcountry Snowboarding, XC Classic Skiing, XC Skate Skiing, Backcountry Skiing, Ice Skating, Snowshoeing
Indoor running
Treadmill Running, Indoor Track Running, Virtual Running
Outdoor running
Running, Outdoor Track Running, Trail Running, Ultra Running, Obstacle Racing
Outdoor recreation
Hiking, Rucking, Indoor Climbing, Bouldering, Climbing, Hunting, Horseback Riding, Golfing, Disc Golf, Archery
Other activity profilesInline Skating
Swimming Features14
Pool swim workoutsYes
Critical swim speedYes
Time and distance alertsYes
Auto rest (pool swim only)Yes
Drill logging (pool swim only)Yes
Pacing alerts (pool swim only)Yes
Countdown start (pool swim only)Yes
Underwater wrist-based heart rateYes
"Repeat on" rest timer (pool swim only)Yes
Basic rest timer (up from 0) (pool swim only)Yes
Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only)Yes
Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories)Yes
Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories)Yes
Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim)
yes (with HRM-Tri, HRM-Swim, HRM-Pro or HRM-Pro Plus)
Tactical Features1
Dual grid coordinatesYes
Outdoor Recreation29
TidesYes
Up AheadYes
Auto restYes
TracBack®Yes
Sight 'N GoYes
Tide glanceYes
Back to startYes
Fish forecastYes
Explore NearbyYes
UltraTrac modeYes
Vertical speedYes
GPS coordinatesYes
Area calculationyes (via Connect IQ™)
Elevation profileYes
Projected waypointYes
Total ascent/descentYes
Future elevation plotYes
NextFork™ navigationYes
Distance to destinationYes
Expedition GPS ActivityYes
Sun and moon informationYes
Point-to-point navigationYes
Preloaded ski resort mapsYes
ClimbPro™ Ascent PlannerYes
Rest Timer (Ultra Run only)Yes
Preloaded road and trail mapsYes
Bread crumb trail in real timeYes
Downloadable cartography supportYes
Barometric trend indicator with Storm AlertYes
Daily Smart Features25
StocksYes
CalendarYes
PasscodeYes
ConnectivityBluetooth®, ANT+®, Wi-Fi®
Garmin ShareYes
Find My PhoneYes
Find My WatchYes
Voice commandYes
Morning reportYes
Weather forecastsYes
Smart NotificationsYes
Smart trainer controlYes
Smartphone compatibilityiPhone®, Android™
Controls smartphone musicYes
On-device Connect IQ™ StoreYes
Plays and controls watch musicYes
Find My Phone during GPS activityYes
Pairs with Garmin Connect™ MobileYes
Compatible with Garmin Messenger appYes
Battery saver (customizable low power watch)Yes
Bluetooth phone calling and voice assistant supportYes
Realtime settings sync with Garmin Connect™ mobileYes
View images from notifications on watch (Android™ only)Yes
Text response/reject phone call with text (Android™ only)Yes
Connect IQ™ (downloadable watch faces, data fields and apps)Yes
Activity Tracking Features11
TrueUp™Yes
Move IQ™Yes
Step counterYes
Floors climbedYes
Calories burnedYes
Distance traveledYes
Intensity minutesYes
Automatic rep countingYes
Garmin Connect™ Challenges appyes (optional Connect IQ app)
Move alerts (displays on device after a period of inactivity)Yes
Auto goal (learns your activity level and assigns a daily step goal)Yes
Workout and Training Plans14
HIIT workoutsYes
Yoga workoutsYes
Cardio workoutsYes
Pilates workoutsYes
Strength workoutsYes
Garmin Cycling CoachYes
Garmin Running CoachYes
Garmin Coach - StrengthYes
Garmin Running Coach ExpertsYes
On-screen workout animationsYes
On-screen workout muscle mapsYes
Garmin Coach - Prebuilt Cycling PlansYes
Daily Suggested Workout - Cycling (Pace and Heart Rate Based)Yes
Daily Suggested Workout - Running (Pace and Heart Rate Based)Yes
Health & Wellness Monitoring19
Sleepyes (advanced)
Hydration
yes (in Garmin Connect™ and optional Connect IQ™ widget)
BreathworkYes
MeditationYes
Fitness ageYes
Sleep coachYes
Nap detectionYes
All-day stressYes
Women's health
yes (in Garmin Connect™ and optional Connect IQ™ widget)
Health snapshotYes
Jet lag adviserYes
Respiration rateYes
Skin temperatureYes
Resting heart rateYes
Breathing variationsYes
Abnormal heart rate alertsyes (high and low)
Relaxation breathing timerYes
Body Battery™ energy monitorYes
Wrist-based heart rate (constant, every second)Yes
Safety and Tracking Features4
AssistanceYes
Live Event SharingYes
Incident Detection during select activitiesYes
Incident detection alert on phone for wearablesYes
Training, Planning and Analysis Features56
% HRRYes
% HR maxYes
HR zonesYes
HR alertsYes
ShortcutsYes
HRV statusYes
Load ratioYes
Manual lapYes
Rest timerYes
Auto max HRYes
Auto scrollYes
Finish timeYes
HR caloriesYes
Voice alertsYes
Custom alertsYes
Physio TrueUpYes
Recovery timeYes
Training loadYes
VO2 Max (Run)Yes
Course guidanceYes
Endurance scoreYes
Training effectYes
Virtual PartnerYes
Workout benefitYes
Race an ActivityYes
Realtime staminaYes
Advanced workoutsYes
Interval trainingYes
Race glance/widgetYes
Training load focusYes
VO2 Max (Trail Run)Yes
Garmin Live SegmentsYes
Strava Live SegmentsYes
GPS speed and distanceYes
Configurable lap alertsYes
Customizable data pagesYes
Unified training statusYes
Touch and/or button lockYes
Activity history on watchYes
Multisport auto transitionYes
Downloadable training plansYes
Training effect (anaerobic)Yes
Manual multisport activitiesYes
HRM running pace and distanceYes
Heat and altitude acclimationYes
Customizable activity profilesYes
Trendline™ Popularity RoutingYes
Auto Pause® automatic timer haltYes
Respiration rate (during exercise)yes (with compatible accessory)
Auto Lap® interval tracking featureYes
Primary benefit (Training Effect labels)Yes
Round-trip course creator (running/cycling)Yes
Power Modes - customizable in-activity battery settingsYes
HR broadcast (broadcasts HR data over ANT+® to paired devices)Yes
Improved interval (includes open repeats, intervals data page, rest screen and auto detection)Yes
HRV stress test (measures your heart rate variability while standing still, for 3 minutes, to provide you with an estimated stress level; the scale of this is 1 to 100; low scores indicate lower stress levels)yes (with compatible accessory)
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fēnix® 8 – 51 mm, Solar — Frequently Asked Questions
What size is the Garmin fēnix® 8 – 51 mm, Solar?
The Garmin fēnix® 8 – 51 mm, Solar has a 51mm case and is 15.4mm thick.
Will the Garmin fēnix® 8 – 51 mm, Solar fit my wrist?
The Garmin fēnix® 8 – 51 mm, Solar looks balanced on flat wrist widths of roughly 54–73mm (about 14.4–19.5cm circumference). Use the interactive fit tool above to check against your own wrist.
How much does the Garmin fēnix® 8 – 51 mm, Solar weigh?
The Garmin fēnix® 8 – 51 mm, Solar weighs 95g (case only; straps add weight).
What is the best way to compare the Garmin fēnix® 8 – 51 mm, Solar with other watches?
Use our side-by-side comparison tool to see the Garmin fēnix® 8 – 51 mm, Solar next to any other watch — case size, thickness, lug-to-lug and full specs, scaled to real proportions.