I'd noticed that - so much for "special black paint" ... unless that means "water soluble"
Also even if it is totally solar powered how do you "sell" electricity from a canal boat?
Actually - we've all been talking about power recently.... how much solar do you need to provide:
Propulsion for a 45 narrowboat (and I mean enough to allow you to navigate the Thames so you can use the electric nests).
jacuzzi bath
towel heater
heating floor
washing machine,
dishwasher,
full-size fridge
I used to know someone who had a totally electric narrowboat - he'd replaced a lot of his ballast with milk float batteries but it needed quite a considerable charge to make it practical.