Fuel cell modulation and temperature control

An exemplary system (910) includes a first fuel cell (FC1) capable of providing an electrical output, a second fuel cell (FC2) capable of providing an electrical output, and a switch circuit (920) that includes one or more switches for arranging the electrical output of the first fuel cell (FC1) and the electrical output of the second fuel cell (FC2) in parallel or series to thereby adjust electrical output efficiency and heat production.