What is the practical difference between Peltiers of different rated current, e.g., TEC1-12706 vs TEC1-12703?
I am wrestling with the same question. From comparing data sheets for different current ratings for the same line of elements I can't find much difference in behaviour, except that you can push higher rated devices to higher currents. On lower currents they appear to behave approximately the same. So number and types of junctions is important for currents well below max, and maximum current is not important in that region. My guess so far...