Edge 840 Solar Bike Computer
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Warning: California Proposition 65
Why We Like The Garmin Edge 840 Solar Bike Computer
The Garmin Edge 840 Solar Bike Computer brings all of the features we love about the Edge 840 with the unique addition of solar charging. When charging in direct sunlight, our battery will last up to 60 hours, adding up to 25 minutes per hour while in battery saver mode to allow longer rides. When used with a compatible heart rate monitor or power meter, we are provided with adaptive coaching, personalized workouts, and stamina insights to help us gauge how much is left in our tank. Whether riding on the road, gravel, or deep in the woods on our favorite dirt trail, the integrated multi-band GNSS technology ensures we stay on the path with superior location accuracy.
Details
- The same Edge 840 we know and love with the addition of solar charging
- Battery life lasts up to 60 hours when charging in direct sunlight
- Responsive touch screen and button controls combine for simple use
- Personalized insights when connected to a power meter or HR monitor
- GNSS multi-band technology keeps us riding through dense trees
- Syncs to the Garmin Connect app to share with Strava, TrainingPeaks, etc
- Item #GRMF06J
- Housing Material
- silicone
- Clock
- yes
- Wireless
- yes
- Backlight
- yes
- Water-Resistant
- IPX7
- Battery Type
- Lithium ion cell contained in equipment
- Battery Life
- [demanding use] up to 32 hours, [battery saver mode] up to 60 hours
- Low Battery Indicator
- yes
- Mount Type
- out-front mount, standard mount
- Includes
- Edge 840 Solar, out-front mount, standard mount, tether, USB-C cable, documentation
- Dimensions
- 2.3 x 3.4 x 0.8in
- Face Size
- 2.6in (diagonal)
- Claimed Weight
- 84.9g (3.0oz)
- Manufacturer Warranty
- limited
- Activity
- cross-country, enduro, gravel, road cycling, trail
Reviews
Q&A
What do you think about this product?
Overall Rating
4 based on 95 ratings
Review Summary
Customer Images
Here's what customers have to say
The bike computer offers a range of features, including connectivity, touchscreen, and solar charging, which is seen as a valuable addition by many users. The device is praised for its accuracy, battery life, and data tracking capabilities. However, some users have experienced issues with syncing activities, bugs, and finding the setup and use a bit overwhelming initially. Overall, the product is viewed as a significant upgrade over previous models, with a mix of positive and negative feedback.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageSeptember 12, 2025
Really appreciate having the touch screen on this model
I've had a 500, 520, 840, and now the 840 solar. Main use right now is adventure riding so I really appreciate having the solar charging. I've found over the years that all the additional functions that have been added are more of a nuisance than anything so I go in and turn off all the notifications about upcoming climbs, Strava segments, fitness metrics, workout load, etc. Some of those were nice when I was heavy into performance on my road bike, using a power meter, etc. Now it's just plain annoying. I just want to be able to look down when I want info and not have to hear constant beeping, dismiss various notifications, be told there's a hill coming up when I can physically see it in front of me. I'm still rating this unit five stars because all that stuff is available if you want it and you can turn it off when you don't. My favorite two things that I really don't want to be without is my Varia radar unit and the integration with Shimano Di2. As I've gotten older, I enjoy just riding at a more relaxed pace. Just built a carbon Salsa Cutthroat with Di2 and I love that you can use the two extra buttons on the hoods to control other functions via the Garmin. I have it set up right now so that the left hood button skips to the next song and the right button is a play/stop button. I throw a bluetooth speaker in my frame bag to enjoy some music while riding. I don't want to be "that guy" on the trail that disturbs the peace with music when other people are around so as soon as I see someone I can just hit the button on the hood and pause my music until I'm out of earshot of the other people. That all works through the Garmin so now I like the way things work together even more.
Originally reviewed on ExpertVoice.com
September 12, 2025
One of the best
The Garmin cycling computers are amongst the finest available. Love this computer!
Originally reviewed on ExpertVoice.com
September 6, 2025
Garmin Solar Computer
Garmin computer itself is great but I do not care so much for the solar feature of this computer. I don't feel it charges computer fast enough. Other than that the computer works great and user interface is easy to use. Also its very easy to connect other ant+ and bluetooth devices to be able to get all the data you could possibly need from your rides. Just wish the solar charged more while being used.
Originally reviewed on ExpertVoice.com
September 3, 2025
Can’t recommend enough
Really enjoying all the features the 840 offers. Highly recommended
Originally reviewed on Garmin
August 18, 2025
Faster than my 830
I bought this recently to replace a lost 830. Although it is faster (processing) I don't like it as much. Had a few glitches with it - get prompts that don't allow you to complete what you were doing and at least once, I ended up in a loop that took dozens of tried to get past and shut down the device to start over. I hope I get used to it and come to like it as much as mt 830.
Originally reviewed on Garmin
August 15, 2025
Solar benefit doesn’t outweigh darker screen
I have had previous Edge models run out of juice on Century rides so solar seemed attractive, but I ride early morning/late afternoon a lot more than all day long and in fading light the screen is too dark. Lots of added features, but none that add huge value
Originally reviewed on Garmin
August 6, 2025
Not Happy
I have been using the Garmin 840 for the past year and a half. I could say there are some good features in this bicycle computer. However, the screen is always hard to read. It's always kind of dark. It is not very clear. That is my only problem with this bicycle computer. One of the things is that if I make it where it's really bright, the battery does not last as much as advertised.
Originally reviewed on Garmin
July 29, 2025
840 Solar
Replaced my Garmin 520, love the 840 solar. Battery life is excellent, especially w/solar technology. Still learning to navigate the screens love the touch screen it is awesome. This product is weel worth the money.
Originally reviewed on Garmin
July 7, 2025
840 solar
Overall a great computer but still glitchy. Grade and elevation are definitely Off. Sensor glitch, I had to do a hard reset and reconnect all the sensors.
Originally reviewed on Garmin
June 29, 2025
Great upgrade for me
I've used a garmin 820 for several years now and have been happy with it. But decided it was time to upgrade so after reading many reviews I went with the 840 solar. My rides are never too long but I thought the solar part would be a good back up in case I was out longer than usual. No issues so far and I'm happy with the purchase! Many thanks Garmin
Originally reviewed on Garmin
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