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@Moonboy
Thanks, I had thought about using a standard dynamo but a quick search only found hub dynamos.
Have looked at solar panels and like you say they don’t produce enough and the ones that do are costly and big.
Batteries are an option but it is a bit wasteful and weighty although convenient.
I will look into the dynamo route further
Found this but $109
*Incase anyone else is looking this **site has a DIY version *for dynamo, also apparently Reecharge will work with bottle dynamo