Hi Folks!
I have some solar cells that almost appear to be made to charge Lion
batteries from discarded cell phones! I use these battery solar cell combos
to rig little LED flashlights!
If I connect the PV directly charging the battery I get almost 40 mA
charging current, however of course in shade or darkness it discharges the
battery, so i always use a diode!
However that bit of voltage drop is critical enough to then only get 12mA
charge current!
I have been thinking about using a transistor voltage drop (<.3V) or maybe a
FET, but I'm not sure I am imagining correctly that the circits I'm thinking
off would indeed prevent reverse currents!

So if anybody could point me to some well established circuits for this
purpose I'd be very grateful!


-- 
Tobias Gogolin
Tel. Movistar (646) 124 32 82
Tel. Telcel (646) 160 58 99
skype: moontogo
messenger: usertogo@hotmail.com

You develop Sustainable Ranch Technology at
http://tech.groups.yahoo.com/group/SURA-TECH
an Open Source Electric Motor/Alternator at
http://groups.yahoo.com/group/Performance_Axial_Flux
and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox
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