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Overcoming Power Challenges in OLPC Deployments

The deployment of One Laptop per Child (OLPC) faces significant power supply challenges, especially in areas with unreliable or no established power grids. Each site presents unique factors affecting power requirements. This document discusses various power management strategies, including battery charging times and alternatives like solar panels and multi-battery chargers. It also highlights the importance of understanding local geography, resources, and school infrastructure to ensure the effective use of laptops in education. The future of power management aims for automated efficiency and extended battery life.

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Overcoming Power Challenges in OLPC Deployments

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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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