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Solar Test Results For XO Laptops |
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Written by David Mul
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Thursday, 28 May 2009 22:35 |
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A two day power source test was conducted on the 19th and 20th of May 2009 by Mr. Tony Benedict of Westlink Enterprises (Solar Energy Systems) and Mr David Mul, Technical Support officer for OLPC PNG at Divine Word University Madang, Papua New Guinea. The aim of the test was to measure the power capacity to fully charge the small laptops. The tests included fully charging the small laptops with the batteries fully discharged, and charging the laptops while it’s running with the server. Telikom PNG Director, Clark Kuliniasi was on hand to witness the solar power tests and was impressed. The tests were done to confirm the number of laptops that can be charged while the server with the satellite modem and wireless access point are running at the same time.
Below are the results of the tests.
Divine Word University | | OLPC - Solar Test Results | | Date : 19th May 2009 | | | | | | | | Weather Conditions | Sunlight up to midday/overcast in the pm | | Solar Generated Energy | 400Watts | | Open Circuit | 38 - 42Volts | | Closed Circuit | 28 - 32Volts | | Charge regulator | 30Amps | | | | Test commences | 11.45hrs | | | | | TEST | Time | Laptops | Reading | Inverter | | 1 | 11.45 | 5 | 5.2A | UPS | | 2 | 11.50 | 10 | 10.3A | UPS | | 3 | 11.54 | 15 | 2.5A | UPS | | 4 | 12.03 | 20 | 2.3A | UPS | | 5 | 12.04 | 25 | 3.2A | UPS | | 6 | 12.06 | 30 | 16.4A | Server loaded | | 7 | 12.07 | 40 | 19.3A | Server loaded | | 8 | 12.08 | 45 | | | | Date : 20th May 2009 | | | | | | | | Weather Conditions | Overcast with moderate sunlight | | | | Solar Generated Energy | 400Watts | | | | | Open Circuit | 42.8 Volts | | | | | Closed Circuit | 34.6 Volts | | | | | Charge regulator | 30Amps | | | | | | | | | | | Test commences | 11.42hrs | | | | | | | | | | | TEST | Time | Laptops | Reading | | | 1 | 11.42 | 5 | 5.0A | Inverter Operated | | 2 | 11.43 | 10 | 9.8A | Inverter Operated | | 3 | 11.44 | 15 | 14.9A | Inverter Operated | | 4 | 12.03 | 20 | 10.9A | UPS | | 5 | 12.04 | 25 | 10.9A | UPS | | 6 | 12.06 | 30 | 16.3A | UPS | | 7 | 12.07 | 40 | 18A | UPS | | 8 | 12.08 | 45 | 20A | UPS | | Summary | | Laptop | Time | Draw Current | Laptops | | Laptop Charging Time | 2.5 | 1.2A | 1 | | Laptop charge/operated | Unlimited | 1.5 | 1 | | | | | | | Laptop Charging Time | 2.5 | 5 Amps | 5 | | Laptop charge/operated | Unlimited | 8 Amps | 5 | | | | | | | Laptop Charging Time | 2.5 | 10 Amps | 10 | | Laptop charge/operated | Unlimited | 12 Amps | 10 | | | | | | | Laptop Charging Time | 2.5 | 16 Amps | 15 | | Laptop charge/operated | Unlimited | 13.5 Amps | 15 | | | | | | | | Based on the test the following are the power requirements | | | | | | | | | No of Laptops | Power Required | Server | Satellite Receiver | | | | | Telikom | | 5 | 6 Amps | 2.2 Amps | 3.2 Amps | | 10 | 11 Amps | | | | 15 | 15 Amps | | | | 20 | 18 Amps | | | | 25 | 25 Amps | | | | 30 | 32 Amps | | | | 35 | 37 Amps | | | | 40 | 42 Amps | | | | 45 | 47 Amps | | | | 50 | 52 Amps | | | | 55 | 57 Amps | | | | 60 | 62 Amps | | | | | | | | | Total Power Draw | 68 Amps | | | | Inverter | 1800Watts | | | | Solar | 400Watts | | | | Battery | 500Ah | | |
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Last Updated on Thursday, 28 May 2009 23:11 |