One panel = 20V, 16A = 320 watts. ??
I do not have a data sheet but many panels measure current at 0V and measure voltage a 0A. Which is not right (I think).
I found a panel like this:
Voltage = 21.6V at 0A, Current = 15.11A at 0V
At MPT 17.64V, 14.17A =250W.
So when you are charging at MPT and very bright Sun then the current will be 14A x 2 = 28A (two panels).
If you are using a PWM to change the voltage/current then: 17.64V, 14.17A from the panel will become 14V, 17.8A on the battery. (x2 for two panels)