Looking for the lowest-power laptop possible, for use off grid powered by a very small solar array. My Yoga 2 11 draws 14 watts at idle (or what I would call idle, anyway). Five watts would be better. Four would be better still. Etc.
Should be a real laptop (not tablet) with a real keyboard (not chiclet). I watch videos on it, but other than that no heavy lifting. I have looked at the EnergyStar listings, found them difficult to use, and am unsure how to compare their numbers with my real-life experience.
Specific recommendations are welcome. So are general principles, e.g. which types of components are most energy efficient. I assume that SSDs are better than spinning disks, and passive cooling better than fans. Beyond that I have no idea--e.g., which types of display, memory, power supply, etc. are best.