Calculating kWh from an AC current and voltage logger

The information you require to do this is the logger’s sample rate.  Now, do the following: (in TrendReader for Windows)

Graph the file of information, and zoom in on the period you wish to determine the KWH for.

Enter the following custom equation under EQUATION, NEW EQUATION:

Note that in this formula we have considered : Source0 as the Phase1 Current

Source1 as Phase2 Current, Source2 as Phase3 Current , Source3 as Voltage Phase1, Source4 as Voltage Phase2, Source5 as Voltage Phase3

After the equation is written, select FILE, SAVE, and make a note of the equation number.

Now apply the custom equation to the graph by selecting EQUATIONS, ADD COMPOUND LINE TO GRAPH and enter the equation number from step 3 and press the Enter (or Return) key.

Click your mouse once on Source0 and then on Current Phase1, then Source1 and Current Phase2, then Source2 and Current Phase3, then Source3 and Voltage Phase1, then Source4 and Voltage Phase2 and finally Source5 and VoltagePhase3. Click your mouse on Source9 and on Constant.  You will now have a new menu box appear, prompting you for the value of the constant.

Enter the logger’s sample rate in minutes. Then select OK and ACCEPT. You will now have a graph of the KWH.

To determine the total KWH, move your mouse to the far right hand side of the KWH line or view the Graph Statistics and look up the “High” value for the KWH line.