Nobody? Post went through? On Wed, Jun 1, 2011 at 4:45 PM, V G wrote: > Okay, so would this work? > > My idea is to use one of these solar cells ( > http://futurlec.com/Solar_Cell.shtml), probably the 6 or 9 volt, plug it > into a small buck switching regulator and charge a 100-200mAh Li polymer > cell. > > Reasonable? > > The idea behind this is to be able to leave the device (guitar tuner) lyi= ng > around anywhere and charging it from ambient light. At most, it would get > used for a few minutes, once a day, max. So not much energy drained from = the > battery. I'd like to keep the battery floating at 60-70% charge to get th= e > most shelf life (years) out of it. > > For example, I like the 6V 60mA cell on that page. Good size, reasonable > price. The question is, how much voltage and current can I get out of it > under ambient light conditions? For example, a room with the lights on an= d > possibly some daylight (not direct sunlight) shining on it. > > Any other ideas? > > I want to make it as easy and thoughtless as possible to charge the devic= e. > Another option may be an inductive ("wireless power") charging mechanism > where you just put it down on a charging pad and it charges through > induction. > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .