I am installing my first IOTAWATT in a 3-fase system. With direct voltage reference on each fase.
For my mains i am using an SCT013-030 (also selected in firmware) and have de burdens removed (set to “0” <-- should be infinite? in firmware).
A simple accuracy check is to sum the power of the 3 fases and check it against my official meter.
This is way off! Iotawat reports about double the value (+/- 1000Watts vs +/- 500Watts). When delivering to the net (PV’s) Iotawatt reports far less !!? (+/- 500 vs +/- 1000) So it looks like the readings are shifted. A simple correction in the CT windings won’t solve it. Can it be a problem in the reference voltage? I see power factor readings of 0,2 to 0,6 when consuming very little going to 0,8/0,9 when de Heatpump (or other big consumers) kicks in.
also tested a little with SCT06’s. different values but still way off.