5-pound, 150 watt-hour
conformal battery was born out of the necessity to keep radios networked without weighing soldiers down with perhaps a dozen disposable batteries per day.
Energy generation jumped from 400 to 800 watt-hours
But to measure much smaller electricity use, such as a light bulb or hair dryer, it's more practical to use the unit watt-hour
The 320 watt-hours
the system will produce daily means that on a
Midterm batteries are expected to have prototype production tests complete by 1994, a specific power of 150 to 200 watts per kilogram at 80 percent depth of discharge, and a specific energy of more than 80 watt-hours
The former is rated at 95 watt-hours
, which means it produces one watt of power for 95 hours, while the latter is rated at 50 watt-hours
Specifically, advanced carbon fluoride batteries have a volumetric energy density of 700 to 1000 Watt-hours
per liter (Wh/l) compared to manganese dioxide's typical 500-650 Wh/1 in the form factors commonly used in medical implants.
Approximately two shot glasses of ethanol could yield enough hydrogen to generate 350 watt-hours
of electricity, enough to power half a dozen 60-watt lightbulbs for an hour.
The total average watt-hours
per day helps determine the size of the system needed.
of weight a rider carries, an additional 700 watt-hours
of energy is available (compared to ~350 watt-hours
for an ultra-high performance lithium-polymer battery at a weight of 7 lbs.
2) Saving even a few percent of the world's estimated 16,000-plus terawatt-hours (TWh) annual consumption of electricity (3) amounts to several hundreds of trillions of Watt-hours
According to a report in New Scientist, during the storm, the amount of energy available to the craft dropped to an unsustainable 89 watt-hours
, the lowest level seen since Spirit and its twin, Opportunity, landed on Mars with about 10 times that amount in January 2004.