CCFL consumes more energy than HDD. (forget 7200 r.p.m.)
IEEE 1394 is a "Hot Interconnect", power guzzler. You should physically remove its PHY and power supply circuitry, if intending to use solar.
OLPC XO uses LED backlight. Modular, so that smashed panel can be replaced, without wasting lamp. OLPC XO target power consumption was less than five watt.
The simple fact is, most laptops are not low-power. They are mobile, yes, but low-power-consumption was not the goal to engineer. All but early iBooks are not low power. All PowerPC G4 PowerBooks are not low power. Nineteen-nineties PowerBooks are good candidates: they are fanless, not power monsters, and battery technology has advanced a lot since then.
IEEE 1394 is a "Hot Interconnect", power guzzler. You should physically remove its PHY and power supply circuitry, if intending to use solar.
OLPC XO uses LED backlight. Modular, so that smashed panel can be replaced, without wasting lamp. OLPC XO target power consumption was less than five watt.
The simple fact is, most laptops are not low-power. They are mobile, yes, but low-power-consumption was not the goal to engineer. All but early iBooks are not low power. All PowerPC G4 PowerBooks are not low power. Nineteen-nineties PowerBooks are good candidates: they are fanless, not power monsters, and battery technology has advanced a lot since then.