I have made this kwh sub system. The kwh value on the meter I am using can't be reset so I'm doing the calc in the PLC program. using Modbus to get data from the meter. But I'm not convinced it's right! Although the numbers I get from it look ok. What do people think?
I'm not sure of converting watts/periodunit to kilowatts/periodunit. Shouldn't you multiply the value by 0.001 instead of 1000?