Since I saw a wide, blue sky like this:
Quite a few weeks, in fact. Certainly the battery has suffered due to the solar panel not getting enough sun.
The battery was below 12v even though the solar panel was generating nearly 13. I'll be looking at the charging circuit tomorrow just to make sure it's working ok.I brought the battery home and it's currently on an overnight charge from my Lidl intelligent charger.
I've been thinking about some form of wind generator. I've been wondering if old computer fans could be put to use. I'll see if I can get hold of one and see what sort of voltage it generates. On a swinging mooring you don't need a fancy rotating windmill as the boat always faces into the wind. Just 2 or 3 old fans bolted to a removable pole should suffice.
Today I took the mainsail off Sprite 2 and ran the £16 sail up. It's about two thirds the size of the original sail, but flatter. Even in the slight breeze it seemed to work like a sail. So if tomorrow is dry I might take it out and try it.