Date: Mon, 21 Aug 2006 11:35:01 +0200 From: "Gerhard Kapusta" <[EMAIL PROTECTED]> Subject: AW: [LIB] Libretto solar powered?
Hi David! Thanks for the links. My current favorite is http://www.powerfilmsolar.com/products/military/foldables/index.htm, which will be available in Europe soon. In the meanwhile I made some measurements, how a Lib110 behaves under varying power conditions. To test this I used an adjustable power supply. A combined network/modem card was inserted and active during the tests. - A Lib100 needs 440 - 560mA for charging only, 330 - 780mA for operation and 550 - 1200mA for operation and charging. - Operation (without inserted battery) is possible down to 12,1V. - Reliable charging is only possible down to 14,6V. Below this voltage the battery is not properly charged and the current decreases. That means the Lib runs partly on AC and partly on battery. This state is not visible on the charging led or in the power management utilities! Power management shows "operation on AC", but battery loading percentage decreases! Conclusion: - The spec for the standard power adapter is 15V/2A. This is little bit oversized, 15V/1A would be sufficient for a Lib only. Perhaps with the big docking station and more PCMCIA-Cards 2A can be reached. - For a reliable operation the input voltage must be stabilized to 15V, one can not expect, that on lower voltage the battery still will be loaded and only the loading time increases! - It would be possible to connect a Lib directly to 12V in a car, but it makes no sense, the Lib would run but the battery would be emptyed! And there is a risk aof damaging the Lib because of voltage peaks which occur in a car. Now the next steps are to research the specs for solar panels (voltage/current/light-diagrams) and to search for a 15V stabilizer which operates lower input-voltage. Perhaps it is worth to look to the original 12V-Adapter. - My first idea was to avoid this extra piece... :-(( regards Gerhard _________________________________________ Gerhard Kapusta Email home: [EMAIL PROTECTED] Fax&Voicebox: +4912120-201115
