Damn thats a nice solution! Is the circuit and program available anywhere? On Nov 28, 2007 7:43 AM, Harold Hallikainen wrote: > I helped a group of college students on their solar powered car project. > The body of the car was covered with solar panels. Each had its own MPPT > converter. The MPPT converter was a simple boost converter run by a PIC. > The PIC would dither the PWM based on measured current leaving the > converter and heading towards the battery. If the last duty cycle step > gave us increased current into the battery from this converter, we'd > adjust the duty cycle in that direction again, then measure the current > again. If the measured current was lower than the last one, we'd adjust > the duty cycle the other way. "Every now and then" the PIC would sweep the > entire acceptable duty cycle range to find the maximum. This insured we > did not get stuck on a relative maximum somewhere (though relative maxima > should not exist, just an absolute maximum). > > The converter per panel worked out nicely since each panel was illuminated > differently. This project was 5 to 10 years ago. > > Harold > > > -- > FCC Rules Updated Daily at http://www.hallikainen.com - Advertising > opportunities available! > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- Tobias Gogolin cel. (646) 124 32 82 skype: moontogo messenger: usertogo@hotmail.com You develop an open source motor controller at http://groups.yahoo.com/group/GoBox -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist