I have a three panel solar panel that charges a storage battery from which I charge my devices: phone, ipod, light. This prevents a common problem of devices shutting off if the charge cycle is interrupted (cloudy weather for example). Works great.
I use 4 small micro carabiners (the panel has 4 loops sown into the corners) and attach the panel across my panniers in the back.
Sorry, away on a trip atm so I can't link a photo.
I chose a solar panel to augment my power needs because I do several genres of travel; cycling, kayaking, hiking, so a dynohub wasn't a comprehensive choice given that.
If you lack attachment places on your trailer bag you can add some small D rings from a camping supply store. If it is urethane you can get glue on ones from a canoe/kayak shop so you don't pierce the waterproof design.
Last edited by Happy Feet; 08-02-20 at 08:51 PM.