I am from RED-E (a brand of Omnico) where we make PowerBanks that cater for Cyclists - we have a PowerBank designed to work directly with GoPro camera's and other equipment used with bikes. Some comments from my side of what I've seen in the conversation so far: 1. Solar Panels - Solar Panels are not nearly effective enough anymore, the technology hasn't made many advances in the last 5 years, having said that, batteries have gone from 200 - 500mAh (5 years ago) for most devices to anything up to 6,000mAh for a hand-held device, so what used to be an effective technology is no longer really applicable - the amount of panels you'll need to charge your more modern devices will be a huge inconvenience. 2. Recording Time - the biggest issue here that I've seen with this is not the Powering of a camera, but rather the Memory Card. We hold the account for GoPro in South Africa so we can do a lot of testing with the units, with our 4,000mAh PowerBank you'll get around 7 hours recording time in total (you can add 2 hours to that if you use the BacPack), the problem is that you'll run out of memory card before anything else. 3. Using larger PowerBanks - The biggest issue with using PowerBanks while cycling (if you are doing this professionally, or just take it seriously) is weight. The 'weight-game' in cycling is very competitive and batteries in general are very heavy. While taking a 20,000mAh or 50,000mAh PowerBank may make sense, being a single item that can retain a large enough charge for all your devices, it just doesn't make sense have a 'brick' weighing around 1kg with you. Having smaller ones will benefit you better for 2 reasons; firstly the weight, it'll allow you to spread the weight distribution more evenly across you and your bike - secondly, heat, you lose a lot of water through sweat while pedaling, and a large capacity PowerBank will make that worse for you. They can get up 30degrees while exposed to the environment, that tightly pressed against you or even your bike can do harm to your ride. On a side note - RED-E also offer mounts that allow you to use your PowerBank and GoPro etc. on your bike. Those are just my thoughts, so please scroll passed this if you have already considered all of what I have mentioned. Otherwise, I can help with more insight if you'd like.
