Because the maximum power point appears at about the same output voltage independent of illumination, it appears you'd do fine connecting the panels in parallel, since this would force them all to this MPP voltage. See http://www.linear.com/solutions/4445 for the relationship between MPP and loaded voltage. Harold --=20 FCC Rules Updated Daily at http://www.hallikainen.com Not sent from an iPhone. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .