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But solar panels are great in that you can often charge multiple devices, charge whilst not cycling and can be used on a different bike/ not on a cycling trip.
Output from solar can politely be described as useless - you wouldn't reliably charge even one device with a panel that was reasonable to carry, especially in UK weather.
Get a battery with multiple outputs from TeckNet or Anker or someone, connect it to the dynamo and power the devices from that.
jsabine
Mule 
What are people's thoughts on which is better for touring - a dynamo or portable solar panel?
There are the obvious considerations: difference in charging depending on sunlight (and nighttime), not automatically powering lights etc.
But solar panels are great in that you can often charge multiple devices, charge whilst not cycling and can be used on a different bike/ not on a cycling trip.