Power infrastructure: "Alternative Power Sources for ICT aka XOs": Difference between revisions
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Bensheldon (talk | contribs) (Created page with '== Session Description == Cut and paste == Notes == (thx Tim!)') |
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== Notes == |
== Notes == |
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* talk on Alternative Power use with #olpc |
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(thx Tim!) |
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* in haiti, lucking if you got 2 hours of power a day |
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* "western mind cannot conceive that there's no power when you need it" |
|||
* solar panels is 3% to 17% efficiency |
|||
* cheaper to install solar panels than extend the electrical grid |
|||
* UN estimates 2+ million villages worldwide without electric power |
|||
* panel efficiency drops as temperature rises |
|||
* cells connect in series, so weakestcell will bring others down |
|||
* charge controller needs disconnect feature to prevent loss of energy at night |
|||
* charge controller needs to be automatically switchable between voltages |
|||
* charge controller needs to charge battery slowly to extend battery life |
|||
* lead acid batteries used because they're cheap and hold lots of energy. Temperature has huge effect on battries. |
|||
* bad to store batteries (inactivity hurts them) |
|||
* need *deep cycle* lead acid batteries, not car batteries |
|||
* DC to AC converters loses as much as 30% |
|||
* teachers want to charge cell phones ... do it DC-to-DC (usb in charge controller) |
|||
* micro-hydroelectric ... power from streams and hilltops |
|||
* micro-hydro plant for $5000 |
|||
* small wind turbines .. verticle ones $1k to $2.5k USD |
|||
* bio-gas from big farms ... dont' dump in river, instead get 0.84 kilowatt per pig |
|||
* charging XO ..12 to 17 watts for 1.5 hours to charge battery |
|||
* typical laptop uses 70 watts, XO uses 7 watts |
|||
* haiti bought 350 high-end dell servers ... uses the most amount of energy |
|||
* green WiFi ... shut down at night to save energy ... power linksys router ... $600 traditional way ... $250 with green wifi |
|||
* standard solar design for school with 300/200/100 XOs (+ school server) |
|||
* MoE gets plan, to get competitive bid ... trying to get away from powering AC for principal and TV for night guard |
|||
* building low-power data center with solar panel (in senegal) |
|||
* good gell-cell battery (lead acid) can last 10 years |
|||
* engaging University of Haiti students to build solar installations .. to not drop-ship |
|||
* now starting XoDock ... students who are soon to graduate form SJSU |
|||
* where to put the laptops, how to power them ... focused on #haiti initially .. 48 laptops for $600 |
|||
* xodock team visited 10 schools in may ... 50 in classroom to 300 in classroom |
|||
* anything you can do to make the laptops easier to use increases the usage of them |
|||
* xodock ... lost cost, uniterrupted power, protected storage, safe & easy mobility |
|||
* decided to use common PVS components ... strength to weight ratio, good electrical insulation, fireproof ... "carrier stack" |
|||
* with 8 laptops, 31 pounds, up to 48 laptops (6 racks) ... cable routing .. each rack is $35 |
|||
* uses both AC & DC (solar) ... custom built charger |
|||
* $331 with battery for 48 laptops |
|||
* can now charge 24 laptops in 4 hours, improvements to come ... want 24 laptops in 2 hours |
|||
* delivery date is Dec 10th ... mechanical $210, electrical $131 = $341 ... $531 with battery |
Latest revision as of 18:46, 23 October 2010
Session Description
Cut and paste
Notes
- talk on Alternative Power use with #olpc
- in haiti, lucking if you got 2 hours of power a day
- "western mind cannot conceive that there's no power when you need it"
- solar panels is 3% to 17% efficiency
- cheaper to install solar panels than extend the electrical grid
- UN estimates 2+ million villages worldwide without electric power
- panel efficiency drops as temperature rises
- cells connect in series, so weakestcell will bring others down
- charge controller needs disconnect feature to prevent loss of energy at night
- charge controller needs to be automatically switchable between voltages
- charge controller needs to charge battery slowly to extend battery life
- lead acid batteries used because they're cheap and hold lots of energy. Temperature has huge effect on battries.
- bad to store batteries (inactivity hurts them)
- need *deep cycle* lead acid batteries, not car batteries
- DC to AC converters loses as much as 30%
- teachers want to charge cell phones ... do it DC-to-DC (usb in charge controller)
- micro-hydroelectric ... power from streams and hilltops
- micro-hydro plant for $5000
- small wind turbines .. verticle ones $1k to $2.5k USD
- bio-gas from big farms ... dont' dump in river, instead get 0.84 kilowatt per pig
- charging XO ..12 to 17 watts for 1.5 hours to charge battery
- typical laptop uses 70 watts, XO uses 7 watts
- haiti bought 350 high-end dell servers ... uses the most amount of energy
- green WiFi ... shut down at night to save energy ... power linksys router ... $600 traditional way ... $250 with green wifi
- standard solar design for school with 300/200/100 XOs (+ school server)
- MoE gets plan, to get competitive bid ... trying to get away from powering AC for principal and TV for night guard
- building low-power data center with solar panel (in senegal)
- good gell-cell battery (lead acid) can last 10 years
- engaging University of Haiti students to build solar installations .. to not drop-ship
- now starting XoDock ... students who are soon to graduate form SJSU
- where to put the laptops, how to power them ... focused on #haiti initially .. 48 laptops for $600
- xodock team visited 10 schools in may ... 50 in classroom to 300 in classroom
- anything you can do to make the laptops easier to use increases the usage of them
- xodock ... lost cost, uniterrupted power, protected storage, safe & easy mobility
- decided to use common PVS components ... strength to weight ratio, good electrical insulation, fireproof ... "carrier stack"
- with 8 laptops, 31 pounds, up to 48 laptops (6 racks) ... cable routing .. each rack is $35
- uses both AC & DC (solar) ... custom built charger
- $331 with battery for 48 laptops
- can now charge 24 laptops in 4 hours, improvements to come ... want 24 laptops in 2 hours
- delivery date is Dec 10th ... mechanical $210, electrical $131 = $341 ... $531 with battery