Sure there are conversion losses, so I would expect that the Power on this line to be the DC input power, as the product of DC V * DC A.
AC input power at the time was -480W ( Not an error, this is operating in ESS mode 1 with -480W set point).
I’ve also been looking at the F frames (dc & ac bus parameters) from a Mk3 on another system, this has DC Voltage, and DC current values, but no DC power. So it looks like the power calculation is done by the Cerbo, and there should be no excuse for not getting it right.
On the subject of F frames, the protocol gives the following:-
I’ve found that the ‘inverter current’ for a 2 unit system with the inverters in parallel seems to already be multiplied by the “Inverter Factor”; with values of 20A when the measured input for that inverter is 10A. As the inverter DC currents are not guaranteed to be identical, it seems that reading the dc current from each inverter and doing a sum would be more accurate than just assuming double on the 1st inverter. Note the value in the slave inverter is also doubled.
The only problem with that approach is that the two readings are not synchronous, so if the DC current is changing fast, then this will not give an accurate result.