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Garmin fēnix 8 Solar vs Garmin fēnix 9

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

Garminfēnix 8 SolarGarminfēnix 9
Overview
ReleasedAugust 2024August 2026
Display
Case sizes47 mm or 51 mm43 mm, 47 mm or 51 mm
PanelMemory-in-pixelOLED
Always-on displayYesYes
Display detailAlways-visible sunlight-readable transflective colour memory-in-pixel (MIP) touchscreen, five leakproof inductive buttons. 47 mm: 33 mm (1.3 inch), 260 x 260 pixels. 51 mm: 35.56 mm (1.4 inch), 280 x 280 pixels.AMOLED colour touchscreen; 43 mm is 1.3″ (33 mm) at 416 x 416 pixels; 47 mm and 51 mm are 1.4″ (35.6 mm) at 454 x 454 pixels; Garmin says it's more than twice as bright as the fēnix 8's
Screen protectionPower Sapphire solar charging lensSapphire crystal lens
Health and fitness
ECGYesYes
Blood oxygenYesYes
Skin temperatureYesYes
Sleep apnoea alertsNoNo
High blood pressure alertsNoNo
Body compositionNoNo
Fall detectionNoNo
Crash detectionNoNo
GPSDual-band (L1 and L5)Dual-band (L1 and L5)
Water resistance100 m100 m
SensorsGPS, GLONASS, Galileo, QZSS and BeiDou; SatIQ automatic multi-band selection; Garmin Elevate wrist heart rate, Pulse Ox, barometric altimeter, compass, gyroscope, accelerometer, thermometer, ambient light and depth sensor to 40 m.Garmin Elevate wrist heart rate monitor; Pulse Ox blood oxygen monitor; barometric altimeter; compass; gyroscope; accelerometer; thermometer; ambient light sensor; depth sensor to 40 m
Health featuresGarmin ECG App where regionally available with compatible phone and watch software; Pulse Ox availability varies by country. HRV status, Body Battery, health status/snapshot, skin temperature, sleep coach/score/alignment, breathing variations, nap detection, stress/respiration tracking, lifestyle logging, jet lag adviser and menstrual-cycle/pregnancy tracking. Current maker table includes smart wake alarm and past ovulation estimates.Garmin ECG App (atrial fibrillation); Pulse Ox; skin temperature; high and low heart rate alerts; HRV status; health status; sleep score, sleep coach, sleep alignment and nap detection; breathing variations; Body Battery; all-day stress; Health Snapshot; lifestyle logging; women's health tracking with past ovulation estimates; jet lag adviser
Fitness featuresTraining readiness/status, training load/focus/effect, endurance and hill scores, running tolerance, running power/dynamics, PacePro, ClimbPro, real-time stamina and recovery time. Running economy and step speed loss require a compatible accessory. Garmin running, cycling, strength and triathlon coaching. Scuba single-gas air/nitrox (21–40% oxygen) and apnea modes, EN 13319 depth sensor to 40 m; dive rating is distinct from 10 ATM surface water resistance. Golf, ski, climbing, cycling, swimming, multisport and strength activity profiles. Preloaded TopoActive maps on these Sapphire versions, downloadable regional maps over Wi-Fi, dynamic round-trip routing, NextFork, routes and turn-by-turn directions; golf and SkiView maps. Optional Outdoor Maps+ subscription adds premium maps. No need for a phone to follow stored maps/routes.More than 100 activity profiles; stamina zones and stamina curve; Garmin Epic activity stories in Garmin Connect; training readiness and training status; running tolerance; running economy and step speed loss (with HRM 600); VO2 max, endurance score and hill score; PacePro; ClimbPro; Garmin Coach and Garmin Triathlon Coach plans; indoor rowing VO2 max and power curve (with a power-meter rower); rucking with pack weight up to 100 kg; preloaded TopoActive maps with perspective view, dynamic round-trip routing, NextFork and Up Ahead; ski resort and 43,000+ golf course maps; scuba (single gas, air and nitrox to 40% oxygen) and apnoea diving to 40 m
Safety featuresLED flashlight with white/red light and strobe. Incident detection, assistance, LiveTrack and live event sharing require a compatible paired phone and appropriate connectivity. Can control a separate compatible inReach device; LTE/satellite/SOS built into fēnix 8 Pro are not features of this Solar model.Incident detection during select activities; assistance; LiveTrack; live event sharing (Android only); LED flashlight
Battery and connections
Battery life (maker's claim)Up to 30 daysUp to 29 days
In low-power modeUp to 48 daysUp to 42 days
Mobile data optionNoNo
Works withiPhone and AndroidiPhone and Android
Storage32 GB64 GB
Battery life detailHeadline figures are 51 mm without solar: up to 30 days smartwatch and 48 days battery-saver watch mode. 47 mm: smartwatch 21 days/28 with solar; saver 34/58 days; GPS-only 67/92 h; all satellites 48/59 h on current UK web table (September 2026 owner guide instead says 49 h with solar); multi-band 37/43 h; all satellites plus music 13 h; maximum-battery GPS 132/283 h; expedition 34/58 days. 51 mm: smartwatch 30/48 days; saver 48/107 days; GPS-only 95/149 h; all satellites 68/92 h; multi-band 52/65 h; music 18 h; maximum-battery GPS 186/653 h; expedition 50/118 days. Solar watch/saver/expedition claims assume all-day wear with three hours daily outside at 50,000 lux; GPS solar claims assume use outside at 50,000 lux, with typical SatIQ use for multi-band. Actual battery life depends on enabled features.43, 47 and 51 mm respectively, up to 10, 16 and 29 days in smartwatch mode; 15, 24 and 42 days in low power watch mode; 18, 30 and 54 hours of GPS activity in Normal mode; 15, 25 and 45 hours in Max Accuracy (multi-band); 49, 81 and 145 hours in Max Battery; 7, 12 and 21 hours with music; 10, 18 and 31 days in Expedition mode
ChargingGarmin proprietary plug cable to USB-C computer port or AC adaptor rated at least 5 W, per current owner guide. Lithium-ion battery. Solar charging stops when fully charged or connected to external power.Garmin charging/data cable with proprietary plug
ConnectivityBluetooth, ANT+ and Wi-Fi. Calls use a paired phone; offline watch voice commands and voice notes use the built-in microphone/speaker. Garmin Messenger requires a paired phone/app for ordinary messages. Garmin Pay with supported banks; downloaded local music or supported subscription music services; Connect IQ apps and Garmin Share.Bluetooth, ANT+ and Wi-Fi; multi-band GPS with GPS, GLONASS, Galileo, QZSS and BeiDou and SatIQ; Garmin Pay; speaker and microphone for calls and the phone's voice assistant with a paired phone; voice commands
Storage–Up to 7,000 songs; twice the map storage and 50% more RAM than the fēnix 8
Design
Weight (lightest version)80 g44 g
SoftwareGarminGarmin
Case materialsTitanium bezel (natural or Carbon Grey DLC), fibre-reinforced polymer case and metal rear cover; silicone band.Fibre-reinforced polymer case with titanium rear cover; titanium bezel; leakproof inductive buttons; 10 ATM water rating; dive rated to 40 m (EN 13319); tested to US military standards for thermal, shock and water resistance; operating temperature –20 °C to 45 °C
Size47 mm: 47 x 47 x 15.2 mm. 51 mm: 51 x 51 x 15.4 mm. Silicone wrist fit: 125–208 mm (47 mm), 127–210 mm (51 mm). QuickFit 22 mm and 26 mm bands respectively. 47 mm 80 g with band, 57 g case only; 51 mm 95 g with band, 67 g case only. Headline weight describes 47 mm with supplied silicone band.43 mm is 43 x 43 x 13.8 mm and 44 g case only (61 g with band); 47 mm is 47 x 47 x 13.8 mm and 53 g (75 g); 51 mm is 51 x 51 x 14.7 mm and 65 g (91 g)
Bands–QuickFit silicone bands, 20 mm (43 mm), 22 mm (47 mm) or 26 mm (51 mm); silicone band fits 108–182 mm, 125–208 mm or 127–210 mm wrists
Colours–43 mm in Titanium with Fog Grey or Pebble Grey band; 47 mm and 51 mm in Titanium with Pebble Grey band or Carbon Grey DLC Titanium with Black band
In the box–fēnix 9, charging/data cable, documentation
Reference and release detailMaker announced 27 August 2024; its Italian launch page states both Solar sizes were available that day. UK first shipping day is not independently established.–

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