Presently we are trying to measure 3-phase kW and kWh using the BCPM. From the SPM software, the readings from the BCPM are only in single phase. Can we simply add all the 3-phase readings together or we need to provide a multiplication of 1.73 to the formula?
We say no, you need to choose the three phase measurement registers in the Modbus set for it to be a vector calculation, as opposed to a scalar sum you are suggesting which will be close but not right.
Early on we did find the 3 phase values to be scalar additions of the single phase measurements because PF was reading 2.75 (scalar addition of ~0.85 per phase) but I believe this was resolved to be true three phase power and power factor now.