Just persuaded a supplier to give me a decent discount on a UniSolar ES62 amorphous panel which I'm going to stick on the roof of our garden shed when we refurb/replace it.  Then I'm at least in principle able to extend the project to powering the laptop in the summer... just.  That maxes out my current charge controller nicely.

I'm also talking to my local electricity supplier about getting the go-ahead to connect a mini grid-tie inverter to feed back any unused power when the sun is out and the batteries charged.  This masterplan may swing into action after/if I have installed enough PV capacity to run the laptop over the winter (eg assuming wind isn't going to be able to make a huge contribution) given the huge overcapacity that that implies for the summer.

And I've been discussing with my other half the possibility of covering most of our south-facing garden wall with PV.  Goodness.

Nurse!  Nurse!  Nurse!

Rgds