Hello,
I have a MP2 5000. I control the MP2 power with external software via MK2 interface.
I observe that the MP2 has a jump in power if the MP2 switch to FLOAT mode.
I watch the power with extra single phase meter (SDM120). You see in the measurement:
blue = power MP2 (> 0.0 = deliver power to grid / < 0.0 = load the battery)
red = the grid power
So the grid detects a delivery of power and the victron shows a jump. After that the MP2 shows FLOAT mode.
double check: battery voltage (16s pack):
orange big line: SOC (jumps to 100%)