Hi Andrew, last year , as my last mod for Aranah in prep for cruising in Scotland , I fitted a 100w solar panel onto the stern mast support. I had always left it on as useful to attach things to or haul things over the pulley. I chose an economical firm type panel with an aluminium frame. It came with fixation brackets which I used to attach the panel using L section aluminium lengths one short and one long. The short one spanned the panel and fixed near the top of the mast support and the long one was attached near the base. I wanted a system for attachment that would allow easy removal since I wasn't confidant to transport with it in place. I was pleased to find a solution using bicycle seat tube clamps from Halfords which meant I could adjust by hand to make them nice and tight and in theory adjust the angle of the panel. The cables fed in through a double side entry gland (Force 4) and they reached nicely to my battery after connection to solar controller. After a bit of fiddling to get right length and design the job was done in a day.

Jonathan Knight did something similar but I think with a more solid form of fixing. I can't recall if either was written up but if not I will do it in detail with photos.

Ps...it worked well to power my hungry Peltier fridge.

Roly