mppt vs pwm

jrnymn7 wrote:
"I'm seeing two 150w panels in series only producing a few amps more than my 245w panel. On a better controller I know of a 960w system using 160w panels in pairs for mid 40's producing 48a while I would expect 60a from four 250w 24v panels."

That sure seems counter-intuative. One would think the 12v's in series, having a higher combined Voc, would result in even more wattage being used by the controller. I can see if the mppt was rated for 50v, and you threw 46 volts at it, but most buck converters boast ~98% efficiency, when operated within their duty cycle.

Does it perhaps have to do with the 12v 160w panels being in series, and thus their output would become 160w / 44v = 3.6a, as opposed to ~9a Isc?