How many panels can I have with an...?

Solar_5th_Wheel_

So looks like I need a little help with interpreting the numbers on my charge controller to figure out how many panels I can add.

I have an EPEVER Tracer 3210A MPPT charge controller, and the numbers on this thing indicate a max PV input of 100V and current of 30A. It also indicates that max PV input power is 390W@12V, 780W@24V. This tracks as 390W/12V=32.5A=780W/24V. Where I'm getting hung up is, what if my PV input voltage is closer to the max voltage of 100V? would this mean the controller can handle a max PV input power greater than mentioned above (390W@12V, 780W@24V). Say I wanted to run a series-parallel array that was 880W@75V (~12A)? This voltage is less than the max input voltage and below the 30A current.

Any help would be greatly appreciated. Thank you for your time. 

Photowhit

The current is based on the output of the controller, So a 880 watt input (within their specs) Would output around 880/12=73 amps too high for 12 volt system. or 880/24=36.6 too high for a 24 volt system. Some MPPT charge controllers can be 'over paneled' and you just lose the extra available wattage. I don't know if that's true of the EPever, it does look like it's somewhat true as they list a higher max array;

Solar_5th_Wheel_

Thank you.

So since I'm charging a 12V system, I should keep my panels under 580W? And this will help when panels aren't putting out 100% of their capabilities?

Photowhit

Solar_5th_Wheel_ said:
So since I'm charging a 12V system, I should keep my panels under 580W? And this will help when panels aren't putting out 100% of their capabilities?

That's the way I read it.
Looks like I got the manual for the 3210AN rather than the 3210A, so might hunt down the proper manual.