Date: Sat, 4 Jan 2003 01:17:09 -0600 From: "John Musielewicz" <[EMAIL PROTECTED]> Subject: Re: [LIB] Alternative power idea
----- Original Message ----- From: "Raymond" <[EMAIL PROTECTED]> To: "Libretto" <[EMAIL PROTECTED]> Sent: Friday, January 03, 2003 8:09 PM Subject: Re: [LIB] Alternative power idea > Date: Sat, 04 Jan 2003 10:06:49 +0800 > From: Raymond <[EMAIL PROTECTED]> > Subject: Re: [LIB] Alternative power idea > > At 03:03 PM 3/01/2003 -0800, you wrote: > >Date: Fri, 3 Jan 2003 16:59:49 -0600 > >From: "John Musielewicz" <[EMAIL PROTECTED]> > >Subject: Alternative power idea > > > >I've located over 25% efficent solar cells. Do any of the engineers out > >there have any opinions on how well they would work to power the 110CT > >indoors or at least charge the battery and extend battery life? I think I've > >come up with an idea for a decent light concentrator for the cells. I figure > >the 110 needs ~600mA to operate properly and I think the cells could put at > >least some of that into it. A panel could go right by the keyboard by > >cutting a hole into the case for the cells and concentrator then wired to > >the AC adapter jack through a stepup/down vr with a cutoff for when the AC > >adapter is plugged in. The panel itself could be removeable for outdoor use. > >If the present battery cells were replaced with 3 2000 mAh cells in the > >extended battery pack the aditional room in the battery case could be used > >for the wiring and circuit boards and such. > > I'm not entirely sure where you mean to put the cells, perhaps you could > clarify? In my experience with solar cells you'll need a *lot* more area > than the Libretto has in order to put out anywhere near 600mA even under > full sunlight. We're talking at least the area of a couple of A4 sheets of > paper, more if you want it to be reliable. > > Also remember, light concentrators aren't terribly useful in photovoltaics, > at least those of the silicon variety (note that pretty much no commercial > silicon photovoltaic installation actually uses concentrators). The > efficiency of those panels plummets when they get hot (yes it is ironic and > it does cause problems) which would be a problem that potential > concentrators would have to address for instance. I'd imagine the optics > required to extend the effective area of the cells whilst spreading the > light evenly across all the cells would cost more than just adding cells > and/or be way too bulky to use for the purpose of powering the Libretto anyway. > These cells are the latest technology and are 1 cm to a side with a potential of 2.64 V and actually increase efficieny under increased sun power. I could put 40 near the keyboard. They are rated for 1000 suns. I'm not sure whether they need to be cooled under a concentrator. The concentrator could only be used indoors and removed for outdoor use. There's no doubt this would be expensive since the cells are 35 dollars each. John ************************************************************** 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 **************************************************************
