Outputs

Outputs provide useful values that are computed from input channel values using a calculator like interface.

Click on Outputs in Menu.

Outputs Display

This screen will list any outputs that you have already configured, and allow you to click **add button** to create new ones. You can click **edit button** on existing outputs to change or delete them. There is no practical limit to the number of outputs that you may create. The only requirement is that they be uniquely named.

Adding a new Output

So lets click **add button**:

New Output

This is the calculator interface that eMon Energy uses to specify how to calculate an output using input channel values. A script is created that eMon Energy uses to compute the value when needed. It works just like the simple four function calculators we are all used to, and using the **input Key** key, you can select input channel values to be used in the formula that you are creating. The resulting expression is evaluated left to right, with calculations within parenthesis evaluated before being used.

So lets make an output channel that combines two pumps called PumpWell and PumpDist. We enter the name Pumps in the Name: box and hover over the **input Key** button of the calculator to see a list of the inputs.

Input Select Dropdown

Select PumpWell from the list and it will appear in the calculator formula display. Next click on the **Plus Key**, then repeat the input process selecting PumpDist.

total_power output

Easy as that. Now press **Save** to return to the outputs list. Your new output should appear within a second or two.

Now go back to the Status screen and see that the new output channel is listed and indeed has a value that is the sum of the two inputs PumpWell and PumpDist.

outputs status

Some other useful outputs would be:

  • Power used in a solar PV system, calculated by adding the Solar inverter input to the (PLN) Main input. If for instance the inverter were putting out 4,100 watts and your Mains channel(s) indicated an outflow represented as -3,100 watts, local usage would be 1,000 watts with 3,100 watts exported.

  • Where the Main(s) are monitored and selected circuits within the panel are also measured, you can create an output that shows the aggregate unmeasured usage by subtracting the measured inputs from the Mains as the misc output in the status display above. That output is defined:

misc output