The time line for tracking energy is adjustable from minutes to years. Credits from alternative energy generation are netted against grid power in a simple table to keep track of any power sold back to the grid.

Looking at the main dashboard in greater detail, we find that the red line shows total load with the pink shading underneath representing energy purchased from the utility. The green line shows the power produced by the photo voltaic cells and the green shading shows surplus solar energy that is sold back to the grid or credited to the electric bill.
The dashed green line is a sub-metered portion of the solar array measured on a separate channel. The white area indicates solar generated kilowatt-hours that replaced grid energy. The bar chart on the right shows the dynamic, ever-changing level of power generated vs. power used.
This makes for an interesting dynamic but what is the bottom line at the end of the month or the end of the year? The following table tracks this type of historical output:

Depending upon the type of distributed generation agreement you have with your utility, this table may prove helpful in reconciling any kilowatt-hour credit differences.
Since the system has a wide range of CT's and the ability to capture single, split phase or 3-phase power a many different configurations will exist. To accommodate this variety, the system set-up screen uses pull-down menus to simplify the configuration process.
CT sizes are assigned to the specific devices they measure. Registers are used to assign and/or group CT's and line voltages to determine the power calculations for each device. Totalling takes input from grid power, generated power and sub-metered devices to calculate net power which is unique to each installation.
For more information about the eGauge energy monitor features please visit the Product Comparison Tables on our Smart Meters page or check out the reviews below.
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