I like to share some of my "improvements" to my SO30i which may be working as well for other boats:
My photovoltaic solution (50W module).
The height and angle can be adjusted by the telescopic tiller extension arm which is screwed middle of modules underside.
The handle end of the tiller extension just seats on the deckedge beneath the stanchion.
The module is tied down by the line.
Also doubles as a beer holder...
Hansi - SO30i - SevenEleven - Germany