The Vue energy monitor is designed to work with most residential electrical systems around the world, including single-phase, split-phase, and three-phase panels running at either 120V or 240V. This article covers the technical requirements your electrical system needs to meet, which parts you'll need, and the small number of situations where a Vue may not be the right fit.
Electrical System Requirements
The Vue is compatible with your system if all of the following are true:
Line-to-neutral voltage: up to approximately 264V per phase (covers standard 120V and 240V systems with normal +10% tolerance).
Main line amperage: below 250A, monitored with the included 200A CT sensors.
Branch circuit amperage: below 63A per circuit for full accuracy. The included 50A CT sensors can measure up to 75A, but they begin to saturate above 63A — readings on circuits that regularly draw between 63A and 75A will be slightly understated. Below 63A, readings are fully accurate.
Phase configuration: single-phase, split-phase (two-phase), or three-phase. All three are supported.
Voltage balance across phases: line-to-neutral voltage must be consistent across all lines. Systems with a "high leg" (one line-to-neutral voltage significantly higher than the others) are not supported.
If you're not sure whether your system meets these requirements, send a photo of your electrical panel (with the dead-front cover removed) to our Customer Support team and we'll review it before you order.
What Parts You'll Need
Every Vue kit includes the wire harness, Wi-Fi antenna, mounting hardware, and CT sensors. The quantity of sensors depends on your system type and how many circuits you want to monitor:
200A CT Sensors (for main lines)
All Vue kits include at least two 200A CT sensors.
Single-phase systems only need one 200A CT on the live main — the second sensor in the kit can be set aside. No sensor is needed on the neutral line.
Split-phase (two-phase) systems use both included 200A CTs — one on each live main.
Three-phase systems need three 200A CTs — choose a kit that includes three.
50A CT Sensors (for branch circuits)
Choose a kit based on how many individual circuits you want to monitor, up to 16 per Vue device. The 8-Sensor kit includes eight, the 16-Sensor kit includes sixteen.
If you are unsure, starting with your highest-consumption circuits (HVAC, water heater, EV charger, dryer, range) is a good baseline. You can add more sensors later from the Emporia shop.
Flexible Sensors (for tight panels)
Some panels don't have room for the standard clamp-on 200A sensors, or they use bus bars instead of conventional wiring. In those cases, Flexible Sensors (Rogowski coils) wrap around the main conductors and fit in spaces that standard sensors can't.
Flexible Sensors are sold separately on the Emporia shop. Available as a 2-coil kit (split-phase systems) or a 3-coil kit (three-phase systems). Each kit includes one shared power supply that connects to a breaker in your panel — this is in addition to the Vue's wire harness, so plan for one extra breaker landing.
What You'll Need Besides the Hardware
2.4GHz Wi-Fi with an active internet connection.
Access to your electrical panel, including the ability to safely remove the dead-front cover to reach the breakers and main wiring.
Systems Without a Neutral Line
Some electrical systems, particularly older installations or certain international configurations, do not have a neutral line. In those cases, the Vue's wire harness can be connected to the ground (earth) line instead of the neutral line, provided the ground is free of stray voltage.
Accuracy: The Vue uses the neutral connection as a stable voltage reference for measurements. If the ground line carries any stray voltage, measurements will drift from actual readings.
Safety: If you are not experienced with electrical work, we strongly recommend having a qualified electrician evaluate the ground line before using it in place of a neutral. This is not a place to guess.
Situations Where the Vue May Not Be the Right Fit
A small number of installations are outside the Vue's supported range. If your system matches one of these, contact our Customer Support team before ordering so we can confirm the best approach.
Inaccessible main lines. Some panels use bus bars instead of individual main conductors, or conceal the mains behind a protective plate. Standard 200A clamp-on sensors cannot attach in these cases. Flexible Sensors usually solve this — loop each Flex sensor around the main phase conductors with at least ~1/4 inch of clearance and a ~3-inch loop for accurate readings.
Solar systems that backfeed directly to the utility meter. If your solar installation is wired directly to the meter, bypassing the branch circuits in the panel, the Vue's main CTs will only see consumption and cannot measure solar generation. Solar systems that feed back through the main breaker are fully supported.
High-leg voltage systems. Systems where one line-to-neutral voltage is significantly higher than the others produce unbalanced readings because the Vue calculates measurements from averaged voltage. These systems are not currently supported.
Voltage above ~264V or amperage above 250A. These are hardware limits. Systems that exceed them cannot be accurately monitored with the current Vue product line.
Four-main panels. The Vue has three main ports (A, B, C), so panels with four main lines cannot have each main monitored individually. Two workarounds work well:
Skip mains monitoring and cover all branch circuits with 50A CTs — you still get comprehensive usage data from the branch side.
For A-B-A-B configurations, first verify phase balancing by temporarily placing both 200A CTs on the two A-phase lines and comparing Amps/Volts in the app, then repeat on the two B-phase lines. Once balance is confirmed, install one 200A CT on one A-phase main and one on one B-phase main, then apply a 2× multiplier in the app to account for the unmonitored lines. Alternatively, use Flexible Sensors looped around paired same-phase mains.
International Compatibility
The Vue is in use on six continents. The core hardware is compatible with both 120V and 240V systems and with all three phase configurations listed above. Because the Vue is powered through its wire harness directly from your panel rather than a wall outlet, there is no region-specific power cable to worry about — the same hardware works wherever your panel voltage and phase configuration match.
Still Not Sure?
If after reading this you are still not sure whether the Vue fits your home, send a photo of your panel (dead-front cover removed so the breakers and wiring are visible) to our Customer Support team, along with a note about your phase configuration, voltage, and amperage if you know them. We will review your setup and confirm the right kit.
Feedback and Suggestions
This knowledge base is continuously updated to provide the most helpful guidance for Emporia customers. If you found this article unclear or have suggestions for improvement, please contact our Customer Support team.