MY SCHNEIDER XW PRO 6848 IS MAKING A SCREECHING SOUND

Hello,
My setup is 3 Schneider Inverters WX pro 6848, 3 CC MPPT 80-600, 2 fortress batt 18.5kwh, and 19,000 approx PV. Every time I turn on an appliance that requires more than 1000watts, and the Schneider starts to make a screeching sound as if struggling to manage the load. It tries to supply the energy from what's being generated from the PV and supply the deficit from the batteries. The struggle continues until it ties back into the utility grid. 

Video of screeching sound behavior: https://youtube.com/shorts/4MXIbKzYuWc

Video of settings: https://youtu.be/k5Ky8iZ2kB8