Hi,
I currently run all my main Internet-facing services from home (DNS primary, mail, Web, NTP, etc) on a SheevaPlug drawing 4W--8W from a solar-powered off-grid system with a fair chunk of battery storage (lead-acid gel and LiPO4).
I'm now trying to move all those services to a Raspberry Pi Model B which with just software tweaks, and already running probably the most heavyweight of my apps, the RPi draws about 1.75W, even with a *big* SD card to hold all of my current files/repositories with some to spare (meaning no external Flash thumbdrive is needed either on the RPi).
http://www.earth.org.uk/note-on-Raspberry-Pi-setup.htmlI have added an RTC card.
I will shortly add some ADCs for monitoring battery voltage, and have started using the GPIO already: this will mean that I don't have to run a k8055 USB I/O card which will save another 300mW over the SheevaPlug system.
http://www.earth.org.uk/note-on-Raspberry-Pi-setup.html#GPIO1So after some fiddling around today making myself an ad-hoc RPi 'shield' I have a software-controlled solar desk light!
In any case, I really hope that the RPi solution will come in at well under 2W* all-in, which makes the ADSL modem at 7.7W look greedy for example!
Rgds
Damon
*Possibly under 1.5W when I replace the crappy on-board 3V3 linear regulator with a switcher...