The multiplier feature in the Emporia Energy app is a useful tool designed for specific monitoring scenarios. It adjusts the measured voltage for a sensor by a set factor, effectively simulating line-to-line voltage rather than the default line-to-neutral voltage measured by the energy monitor.
This feature is particularly helpful when monitoring dual-pole (or multi-pole) appliance loads with a single sensor, saving sensor count while maintaining accurate power calculations under certain conditions.
Key Points About Multipliers
Direct Voltage Measurement:
The Vue 2 and Vue 3 Energy Monitors directly measure voltage, so in most cases, no default multiplier is required. For example, if your system runs on 240V, the Vue 2 and Vue 3 automatically recognizes this, and no multiplier is needed.
Common Use Case:
Multipliers are most commonly applied when monitoring multi-pole circuits with a single sensor.Example:
If you have a dual-pole circuit where each line pulls 10A at 120V, the total power usage is 2.4kW (1.2kW per line). Instead of using two sensors to measure both lines, you can use one sensor on a single line and apply a 2.0 multiplier in the app. The multiplier adjusts the 120V reading to 240V, accurately reflecting the total 2.4kW usage.
Caution with Multipliers:
Multipliers are a shortcut and can lead to inaccuracies if the lines being monitored behave differently. For instance, if one line pulls 5A while the other pulls 10A, the actual total usage would be 1.8kW. However, with a 2.0 multiplier applied to the 10A reading, the app would display an inaccurate value of 2.4kW.This discrepancy can cause issues in the app, such as incorrect 50A CT readings and discrepancies in the “Balance” section. (Learn more about Balance here.)
Should I Use a Multiplier?
If you’re unsure whether a multiplier is appropriate:
Test with an Additional Sensor: Add a second sensor to the other line of the circuit for a few days to compare readings.
Analyze the Data: If both lines show similar behavior, using a multiplier should be fine. However, if the lines show significant differences, it’s best to leave two sensors in place for accuracy.
Important Note: Direct measurement using sensors will always be more accurate than assuming usage through a multiplier. Emporia Customer Support almost always recommends measuring directly with sensor(s) rather than using multipliers.
Feedback and Support
At Emporia Energy, we strive to provide clear and helpful resources to help you manage your energy better. If you have questions or suggestions about this article, please contact our Customer Support team.