The MS 60 has a "nominal" panel watts limit of 800/12 and 1600/24, but does allow for "over-panelling" because it has that 60 amp output control. 800w/12v = 66.7 amps. They have a note suggesting over-panelling can be good for you.
I can see how the wattage doubles if you hold amps the same and double the voltage. But that Midnite has lower output amps ratings for each rise in voltage. I didn't see where they show any panel wattage amounts.
if you do have 800w rating of panel as input, then with 25C above ambient for panel temp, like 25c/50C then you have 10% power loss: 800-80=720w and
720/12 = 60 amps but you can have other circumstances.
