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One Laptop per Child

One Laptop per Child. One Laptop per Child. Laptop Power September 18 , 2008. Challenges. Supplying power can be a large and difficult challenge in a deployment. Even in areas with a power grid Lack of an established grid increased the difficulty significantly

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One Laptop per Child

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  1. One Laptop per Child One Laptop per Child Laptop Power September 18 , 2008

  2. Challenges • Supplying power can be a large and difficult challenge in a deployment. Even in areas with a power grid • Lack of an established grid increased the difficulty significantly • No recipe solutions. Each site is unique

  3. How Much Power? • 2 Primary modes • Charging battery • Not charging • Charging battery • Max draw of 17 Watts • Not charging • Less than 1 watt in sleep • Avg 4 – 7 watts while running w/ peaks up to 9W

  4. Charging. How Long? • Fastest. Laptop off • All power used to charge battery • 1 hour 46 Minutes • Laptop on • Excess power used to charge power • About 2 and half hours

  5. Various solar panels at MAX output • Laptopoff • 5W 5 hours 15 minutes • 7W 3 hours 45 minutes • 10W 2 hours 40 minutes

  6. Alternative Power Sources • Solar • 5/7/10 Watt solutions • Weza • Approx 30 Watt output • 2 Batteries in 2 hours • 7Ah LA battery. Will charge 2 batteries • Weza battery needs recharging after

  7. Alternative Power Sources • Crank • Still needs 2 hours of cranking. • Not really viable until Gen 2. • Grass Roots • Cow power • Water, Wind, Pedal,Treadle

  8. Multi-Battery Charger • Charges 15 batteries in 2 hours • 300 Watt AC • 120 Watt DC option (10 – 28 Volt input)‏ • 8 Batteries in 2 hours • Direct connection to 60W solar blanket(s)‏

  9. Power Management • Available today: • Hardware ready for suspend/resume • Current stable builds have support for sleep on lid close or button • About 4 hours of battery life during normal use • 14-16 hours of battery life in sleep mode • 8.2.x Has New “Extreme” power savings mode + additional power savings in sleep for non-mesh. (40+ hours of life in sleep)‏

  10. Power Management • Future: • Automatic management of suspend/resume • Aggressive CPU suspend • Suspend measurements are in the 2 watt range.

  11. Helping OLPC • Deployment Location Information • Information we need • What is the climate and geography of deployment areas? • Names of closest large city. • What natural resources are available? • How many schools, how many kids, and how many kids per class?

  12. Helping OLPC • How many of those schools don't have a power grid or have unreliable power? • Expected laptop usage. How often will you need to recharge the batteries?

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