question

In my case, my charging controller's model is Victron SmartSolar MPPT 150/100. The most important number in that is the "150" which means "maximum 150VDC in". Also in my case, I have four 400W panels that each have 45VDC/11A output maximum. In series they would present (4 x 45VDC = 180VDC) to the charge controller and it would have to shunt or otherwise ignore the 30V over-voltage. [Nick indicates that the 30VDC over-voltage would toast the MPPT = bad.] In parallel, they would present (4 x 11A = 44A) to the charge controller and that would be acceptable since it's below the "100" in the product's model number. [Nick says that the upper current limit on mine is actually 70A.]

Optimally, though, you want to maximize the presented voltage to the charge controller so I ran pairs of panels in series (2 x 45DC = 90VDC, 1 x 11A = 11A) and then connected the pairs in parallel (1 x 90VDC = 90VDC, 2 x 11A = 22A). The system is optimal at this point. I converted a friend's solar system to change his from eight panels in parallel to two sets of four in series; it's now twice as functional as before.

Is it possible that your voltage-in-series is now too high for your charge controller?

Which charger is this? RS450? That is the only model capable of those voltages and available in 100 and 200A variants.

High voltage equals lower current. Ohms law.

I suggest you use the MPPT calculator, enter your panel specs and confirm that you are correctly configured and designed.

Edit: I see its the 200A. So max power is 200A x battery voltage so around 10kW.

Various specs all in the datasheet. You have way overpanelled, typically no more than 30% (since typical loss from ideal conditions to the real world is roughly 1/3)

The calculator really should have been used before spending the cash.

OP has 4x 200A MPPTS.