Final calculations

Hey Y'all,

It has been a while since I was in the class and I need help with the final calculations for the placards on my first project.

Does anyone know of a good website I can go to that will figure out the 

Open circuit voltage

operating voltage

Maximum system voltage

operating current

short circuit current

maximum power

for my system?

I am using 20 Schott 235's and 10 D380 Enphase inverters.  Any help would be appreciated.