Date: Tue, 30 Apr 2002 07:15:08 +0800 From: Raymond <[EMAIL PROTECTED]> Subject: Re: [LIB] Solar Panels
At 02:41 PM 29/04/2002 -0700, you wrote: >Date: Mon, 29 Apr 2002 16:39:54 -0500 >From: [EMAIL PROTECTED] >Subject: Solar Panels > >There was some interest in using the Libretto with solar panels a >while back. I think I might have found some that will work if the >information I found is accurate. First I found out that the Libretto >takes about a amp of current from the AC adapter when it isn't >charging and is being used. Second I found that when the Libretto >is off and charging it uses about .6 amp. Has anyone measured the >current that can confirm these measurements? Well I found some very different results with my L50 when I was mucking around with an automobile laptop adapter ... the current consumption actually went UP when I switched it off (presumably because the battery went into fastcharge - it was dead at the time). During running, I was at about 800mA, in the first bit of charging I was in excess of 1.5A! Enough to brown out the 1A regulator I was using at the time ... > So with this I found >some setups that might work. They provide about 1.2 amps or >greater which would be enough to run but you'd really want to shut >it off to charge otherwise it'd take about three days to fully charge >the battery. Well depending on what the situation is, it might well be better to get the solar panel to charge a lead acid cell and run the libby off that ... charging circuits that will properly and efficiently charge a lead acid cell from a solar panel are readily available whilst charging a 15V Libby from a 12 volt solar panel would be considerably less efficient. Reasonably lightweight lead acid cells of several AH can be had relatively cheaply and will run a libby (with an auto adapter or using a tricker) continuously for at least a day (plus IIRC the discharge curve is considerably nicer on a lead acid cell) ... - Raymond --- /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\ | | "Does fuzzy logic tickle?" | | ___ | "My HDD has no reverse. How do I backup?" | | /__/ +-------------------------------------------| | / \ a y b o t | [EMAIL PROTECTED] | | | HTTP://www.raybot.net | | ICQ: 31756092 | Need help? Visit #Windows98 on DALNet! | \~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/ ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
