I'm just going to go with a blanket 18% above rated power. Let's see how that washes against your actual numbers.
No razzle dazzle math for me, just a straight across the board 18%
with 30 batteries on tap I think there will be no question they will have all the power available to do an "indisputable" test.
Good luck! Wish you were closer, I'd be more than happy to have helped out in any way.
Thnaks