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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Frans<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Great sets of information. If a stove generates power then it would have to be above 4.2 volts, plus 0.6 or so for the zener to clip it at 4.2. That means 4.8 so let’s say 5 VDC from the TEG, yes? Reasonable?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>That will charge single cells which is the most likely circumstance on a recycled battery approach.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I used to play with Jones Choppers (saturating core + SCR) back when I wanted to make electronically controlled wheel chairs with DC permanent magnet motors. Extremely efficient. It was ahead of its time. Oh well. Now everything is like that.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So it gets simple now. Bolt a TEG on the stove, draw 5+ volts, limit the voltage to 4.2 and away it goes. I think most TEG’s will not give over-current if the thing can take 2 amps. Getting a 5 watt module is not so cheap. Like solar electric, best to have a system that can run wide open on the charge cycle without damaging the batteries. There I a guy in Paal, near Cape Town who designs and sells converters who used that approach to avoid having a voltage regulator on the batteries. The excess heat generated when fully charged was able to be dissipated by the battery pack design. It works on very simple systems. Thus the stove TEG should be matched on the max current the battery can tolerate.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0mm 0mm 0mm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> stoves-bounces@lists.bioenergylists.org [mailto:stoves-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Frans Peeters<br><b>Sent:</b> Friday, February 03, 2012 6:29 AM<br><b>To:</b> 'Discussion of biomass cooking stoves'<br><b>Subject:</b> Re: [Stoves] TEG great idea / Li ION recup small idea<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Dear Crispin,<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> Charging any battery needs OVERVOLTAGE A car battery of 12V needs 14,5V in the car to charge it and well controled: max 15,5 till the First H2 bubbel apears .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>In labtop Li ION is used in FAST mode !And for safety each couple so 4 controls are done also one or 3 temperature sensors ! and some times a pressure switch inside a cell! Not resetable !<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Exemple : 4cells in paralel =3,7 V .Empty is 2,9 V .</span><b><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>Charging must be 4,2V exact</span></b><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> ! no more. Current limited to 0,5 A otherwise it takes 3,5 A After 10 minutes no current limmited takes 1,5 A for 2 hours Stop at O,9 amp . No heat !<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Use 24 LED Hüfner lampset with regulator for 4,5 V . For other LED combinations 3,2 V you substract 0,6 V with any Si diode zener-effect like 1N 1002 1Amp 3,7-0,6 V=3,1 V Or Ge diode is minus 0,4 V like OA100 .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>You must not charge and licht the same time!<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Is high power 100 000 candela or 1watt or 40 watt ? It exist .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>But 24 leds for 480 mA is all you need to work at night in the garden .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Labtop uses no chopper in the battery ! It only NEEDED OVERTENSION to charge . Battery 14,8 V is charger 20 V and 8cells ,4serie couple .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>6cells in serie 6x3,7 =22,2 V battery but charger 4,2x6=25,2V switched power supply at 40 KHz to make it light weight end cheaper than a transformer of 100 Watt and less losses ..<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>LED controler Chips use puls wide regulation.and tension adaption .<o:p></o:p></span></p><p class=MsoNormal><b><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:fuchsia'>A dead battery pack can be new in the cells and broken in the chips inside the pack !! Or 1cell bad and 7 new for Africa …..= 100$ from the waste bin !!!<o:p></o:p></span></b></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>(Even a dead cell in a new envelope gave tension again !! Only by pressure switch off,inside the cell !.</span><b><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:red'>MIND NERVE GAS under pression</span></b><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> )<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Regards<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Frans<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p></div></body></html>