Home energy monitors help you see how much electricity your home uses, and some also break usage down by individual circuits. My best overall pick is the Emporia Vue 3 Home Energy Monitor with 16 Circuit Sensors for broad circuit coverage; the Refoss EM16P stands out for open API access, while the Eyedro 200A is a simpler whole-home option with Wi-Fi and Ethernet. The main tradeoffs are whole-home visibility versus circuit-level detail, cloud convenience versus local control, and the extra setup needed as sensor counts rise. The products in this roundup vary widely in smart-home integration and included accessories, so the model name alone does not tell the whole story. Read on for the full breakdown and a guide to choosing a monitor that fits your electrical panel and priorities.
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Key Takeaways
- Included sensor counts change the comparison: Emporia Vue 3 versions appear with 8 or 16 circuit sensors, and the 16-sensor bundle adds broader circuit tracking than the basic monitor.
- Open or local control separates the smart-home-focused options: Refoss EM16P, Refoss Local Control, Sungrass eMonHub, and Meross Home Assistant models appeal to buyers who want integrations beyond a standard app.
- Whole-home monitoring and circuit monitoring solve different problems: Eyedro’s 200A Wi-Fi and Ethernet setup emphasizes whole-home readings, while multi-sensor models can help identify which circuits drive usage.
- Accessories can change the value of a bundle: Emporia’s package with 16 sensors and four smart plugs adds device-level monitoring options that sensor-only bundles do not provide.
- More circuit coverage also means more installation planning: Models listing 16 or 18 circuits may offer more detail, but buyers should confirm panel space, sensor fit, and electrical compatibility before choosing.
| Refoss EM16P Smart Home Energy Monitor with Open API and Home Assistant |  | Best for Local Home Assistant Control | Model: EM16P | Main circuit sensors: 2 sensors, 2–200A each | Branch circuit sensors: 16 sensors, 1–60A each | VIEW LATEST PRICE | See Our Full Breakdown |
| Sungrass eMonHub Home Energy Monitor for Home Assistant |  | Best for Solar and Storage Tracking | Model: eMonHub-HNA0A-HA | Circuits monitored: 10 per unit; scalable to 30 with 2–3 units | Current transformers: 2 × 200A and 8 × 50A; range adjustable per channel | VIEW LATEST PRICE | See Our Full Breakdown |
| Siemens Inhab Smart Home Energy Monitor with Circuit-Level Sensors |  | Best App-Led Energy Management | Model: INHEM1216 | Main sensors: 2 × 200A CTs | Circuit sensors: 16 × 50A CTs | VIEW LATEST PRICE | See Our Full Breakdown |
| Refoss Smart Home Energy Monitor with 16 Circuit Sensors and Local Control |  | Best for Long-Term Local Data | Model: EM16P | Main current transformers: 2, up to 200A | Branch circuit sensors: 16, up to 60A each | VIEW LATEST PRICE | See Our Full Breakdown |
| Eyedro Smart Home Energy Monitor, 200A, Wi-Fi and Ethernet |  | Best for Straightforward Whole-Home Monitoring | Model: EYEDRO-HOME | Current sensor capacity: 200A | Connectivity: 2.4 GHz Wi-Fi or Ethernet | VIEW LATEST PRICE | See Our Full Breakdown |
| Emporia Vue 3 Home Energy Monitor |  | Best for Solar and Net Metering | Model: EMV3A-2P-WH | Connectivity: 2.4 GHz Wi-Fi with internet connection | Accuracy: ±2% | VIEW LATEST PRICE | See Our Full Breakdown |
| Meross Smart Home Energy Monitor with Home Assistant Support |  | Best for Home Assistant and Local Data | Model: EM16 | Main circuit capacity: 2 circuits, 200A | Branch circuit capacity: 16 circuits, 60A | VIEW LATEST PRICE | See Our Full Breakdown |
| Emporia Whole-Home Energy Monitor Bundle with 16 Sensors and 4 Smart Plugs |  | Best Complete Monitoring Bundle | Circuit monitoring: Main panel and up to 16 individual circuits | Included sensors: 16 | Smart plugs: 4 Wi-Fi plugs | VIEW LATEST PRICE | See Our Full Breakdown |
| Emporia Vue 3 Home Energy Monitor with 16 Circuit Sensors |  | Best for Broad Circuit Coverage | Model: EMV3A-2P-16 | Circuit sensors: 16 branch sensors, 50A each | Supported systems: Single phase, single-split phase, and 2-wire; some 3-wire and 3-phase systems require an additional 200A sensor | VIEW LATEST PRICE | See Our Full Breakdown |
| Emporia Vue 3 Home Energy Monitor with 8 Circuit Sensors |  | Best for a Smaller Circuit Setup | Model: EMV3A-2P-8 | Included sensors: 8 circuit sensors | Supported systems: Single phase, single-split phase, and 2-wire; some 3-wire and 3-phase systems require an additional sensor | VIEW LATEST PRICE | See Our Full Breakdown |
| Meross Smart Home Energy Monitor with 18-Circuit Monitoring | | Best for Broad Circuit Coverage | Circuit monitoring: 2 main circuits (200A) and up to 16 branch circuits (60A) | Accuracy: ±2% | Supported electrical systems: Single-phase 2-wire, split-phase 3-wire, and 3-phase 4-wire Wye with earthed neutral; no Delta | VIEW LATEST PRICE | See Our Full Breakdown |
| Smart Home Energy Monitor with 16 Circuit Sensors |  | Best for Detailed Cost Tracking | Circuit sensors: 16 × 50 A clamp-on sensors | Voltage support: Up to 240 VAC line-neutral, 120/240 VAC split-phase, and 415Y/240 VAC three-phase; no Delta | Accuracy: 1% | VIEW LATEST PRICE | See Our Full Breakdown |
| home energy monitor | Model | Connectivity | Warranty | Accuracy |
|---|---|---|---|---|
| Refoss EM16P Smart Home Energy | EM16P | Built-in web UI, Open API, MQTT, Home Assistant | 2 years | ±1%; ±2% at low current |
| Sungrass eMonHub Home Energy M | eMonHub-HNA0A-HA | Wi-Fi and Ethernet | — | — |
| Siemens Inhab Smart Home Energ | INHEM1216 | Wi-Fi and mobile app | — | — |
| Refoss Smart Home Energy Monit | EM16P | — | 2 years | — |
| Eyedro Smart Home Energy Monit | EYEDRO-HOME | 2.4 GHz Wi-Fi or Ethernet | — | — |
| Emporia Vue 3 Home Energy Moni | EMV3A-2P-WH | 2.4 GHz Wi-Fi with internet connection | 1 year | ±2% |
| Meross Smart Home Energy Monit | EM16 | — | 2 years | ±1% |
| Emporia Whole-Home Energy Moni | — | — | — | — |
| Emporia Vue 3 Home Energy Moni | EMV3A-2P-16 | 2.4 GHz Wi-Fi with internet connection | 1 year | — |
| Emporia Vue 3 Home Energy Moni | EMV3A-2P-8 | 2.4 GHz Wi-Fi and internet connection required | 1 year | ±2% |
| Meross Smart Home Energy Monit | EM16 | Home Assistant, Open API, and Web Control | 2 years | ±2% |
| Smart Home Energy Monitor with | SEM-Meter | 2.4 GHz Wi-Fi; local MQTT mode requires Home Assistant | 1 year | 1% |
More Details on Our Top Picks
Refoss EM16P Smart Home Energy Monitor with Open API and Home Assistant
The Refoss EM16P is the strongest fit here for buyers who want circuit-level monitoring without cloud dependence. It tracks two main circuits and up to 16 branches, then exposes readings through a local web interface, Open API, MQTT, and native Home Assistant integration. That gives technically confident owners room to build solar self-consumption automations and circuit alerts while keeping data on their own network. Compared with the Siemens Inhab, Refoss gives more open integration paths and stores up to five years of exportable data; Siemens instead centers its experience on its mobile app and energy-management features. The tradeoff is that installation requires access to the breaker panel, and the stated accuracy drops to ±2% at low current. I’d pick it for flexibility, not for a hands-off setup.
Pros:- Local web interface, Open API, MQTT, and native Home Assistant integration
- Monitors two main circuits and up to 16 branch circuits
- Stores up to five years of data for export
- Supports solar self-consumption automations and circuit-level alerts
Cons:- Requires installation at the household circuit panel
- Accuracy is specified as ±2% at low current, rather than the usual ±1%
Best for: Home Assistant users who want local, customizable monitoring across many household circuits and solar automations.
Not ideal for: Buyers who want a simple app-only setup or cannot arrange safe installation inside an electrical panel.
- Model:EM16P
- Main circuit sensors:2 sensors, 2–200A each
- Branch circuit sensors:16 sensors, 1–60A each
- Accuracy:±1%; ±2% at low current
- Data storage:Up to 5 years
- Connectivity:Built-in web UI, Open API, MQTT, Home Assistant
- Certification:ETL certified; compliant with UL 61010
- Warranty:2 years
Our verdict“Choose the Refoss EM16P if local control and Home Assistant flexibility matter more to you than a simpler app-led experience.”
Sungrass eMonHub Home Energy Monitor for Home Assistant
The Sungrass eMonHub earns its place for households that need to see energy moving in both directions, especially when solar, batteries, or vehicle-to-grid systems are involved. It monitors 10 circuits per unit, with expansion to 30 circuits using additional units, and pairs Home Assistant support with local data storage. Wi-Fi and Ethernet give owners a choice between wireless placement and a wired network connection. Compared with the Refoss EM16P, the eMonHub starts with fewer monitored circuits per unit but highlights bidirectional solar, V2G, and battery tracking; Refoss offers more branch sensors in one unit and a longer stated data-retention period. Its broad electrical-system support is useful for varied installations, but panel installation is still required, and expanding circuit coverage means adding units. This is a specialist pick for energy-flow visibility rather than maximum circuit count out of the box.
Pros:- Tracks bidirectional energy flow across monitored circuits
- Supports solar, V2G, and battery storage monitoring
- Works with Home Assistant and local data storage
- Provides both Wi-Fi and Ethernet connectivity
Cons:- Requires installation inside the circuit panel
- Monitors 10 circuits per unit, with additional units needed to scale up to 30
- The supplied product details do not specify a data-retention period or measurement accuracy
Best for: Home Assistant households with solar panels, battery storage, or V2G equipment that want local bidirectional tracking.
Not ideal for: Buyers who need up to 16 branch circuits from one unit or want to avoid adding hardware for wider circuit coverage.
- Model:eMonHub-HNA0A-HA
- Circuits monitored:10 per unit; scalable to 30 with 2–3 units
- Current transformers:2 × 200A and 8 × 50A; range adjustable per channel
- Connectivity:Wi-Fi and Ethernet
- Supported systems:North American split-phase, Brazil two-phase three-wire, single-phase, and three-phase (3P4W)
- Certifications and compliance:FCC and CE certified; tested to UL/IEC standards
- Dimensions:4.73 × 3.15 × 1.22 in
- Weight:2.8 lb
Our verdict“Pick the eMonHub if local Home Assistant monitoring of solar, storage, or V2G energy flows is your priority.”
Siemens Inhab Smart Home Energy Monitor with Circuit-Level Sensors
The Siemens Inhab is the clearest choice for buyers who want panel-level readings paired with app-based energy management, rather than an open automation platform. Its two 200A main sensors and 16 circuit sensors track usage and production, while the mobile app supports alerts, time-of-use and peak-demand management, net metering, solar management, and compatible load shedding. That makes it more guided than the Refoss EM16P, whose strength is local APIs and Home Assistant customization rather than a broad app feature set. Siemens also carries UL Listing, but it is limited to use in the United States and Canada and requires electrical-panel installation. Buyers should also check whether their devices are compatible before counting on load shedding. I’d rank it for households seeking app-centered management; open-platform users have more direct control with Refoss.
Pros:- Measures whole-home use and production plus up to 16 branch circuits
- Tracks real-time and historical energy data
- Includes customizable alerts, solar management, and net-metering support
- Offers load shedding for compatible devices
Cons:- Available for use only in the United States and Canada
- Requires installation in an electrical panel
- Load-shedding features apply only to compatible devices
Best for: US and Canadian homeowners who want circuit-level readings, app alerts, and guided time-of-use or peak-demand management.
Not ideal for: Home Assistant-first users, buyers outside the United States and Canada, or anyone unable to arrange panel installation.
- Model:INHEM1216
- Main sensors:2 × 200A CTs
- Circuit sensors:16 × 50A CTs
- Monitoring:Whole home and up to 16 branch circuits
- Connectivity:Wi-Fi and mobile app
- Supported regions:United States and Canada
- Certifications:CE marked and UL Listed
- Dimensions:1.1 × 5.71 × 2.76 in
Our verdict“Choose the Siemens Inhab if you want a guided mobile-app approach to circuit monitoring and energy management in the US or Canada.”
Refoss Smart Home Energy Monitor with 16 Circuit Sensors and Local Control
This Refoss version is a good match for owners who want local monitoring plus a long record of household energy use. It tracks two main circuits and up to 16 branches, supports several electrical system types, and can retain daily data for up to five years with CSV export. Its Local Web UI, Open API, MQTT, WebSocket, and Home Assistant support give it more ways to connect than the Eyedro Smart Home Energy Monitor, which focuses on whole-home or solar readings through its cloud service. Compared with the other Refoss EM16P listed here, the core sensor count and local-control approach are very similar; this listing specifies WebSocket connectivity and three-phase 4-wire Wye support. That breadth comes with a setup learning curve, and panel access is required. It suits data-minded tinkerers better than buyers seeking a plug-and-play app experience.
Pros:- Monitors two main circuits and up to 16 branch circuits
- Provides local Web UI, Open API, MQTT, WebSocket, and Home Assistant support
- Retains daily data for up to five years with CSV export
- Supports single-phase, split-phase, and three-phase 4-wire Wye systems
Cons:- Requires installation in a breaker box
- Setup and integrations may require technical familiarity
- Does not provide the included mobile-app-centered energy-management approach of the Siemens Inhab
Best for: Technically comfortable homeowners who want local integrations, detailed circuit coverage, and years of exportable energy history.
Not ideal for: Buyers seeking a simple cloud app or those who cannot arrange installation and setup at the breaker panel.
- Model:EM16P
- Main current transformers:2, up to 200A
- Branch circuit sensors:16, up to 60A each
- Supported electrical systems:Single-phase, split-phase, and 3-phase 4-wire Wye
- Measurement precision:±1%
- Connectivity and integrations:Wi-Fi, Local Web UI, Open API, MQTT, WebSocket, Home Assistant
- Data retention:Daily data stored for up to 5 years
- Warranty:2 years
Our verdict“Pick this Refoss if you value local integrations and long-term circuit data and are comfortable configuring the system.”
Eyedro Smart Home Energy Monitor, 200A, Wi-Fi and Ethernet
Eyedro makes more sense for buyers who want to follow whole-home usage or solar generation without installing sensors on a long list of individual circuits. Its two directional 200A sensors report watts, amps, volts, and cost through MyEyedro, and Wi-Fi or Ethernet lets owners choose how the monitor reaches the network. Cloud access has no subscription, which keeps ongoing service simple. Compared with the Siemens Inhab or either Refoss EM16P, Eyedro is less suited to pinpointing which branch circuit is responsible for a change; its appeal is a simpler whole-home view. There is also a firm limitation: one unit can monitor grid energy, solar, or net metering, but not all at once. I’d choose it for basic household or solar visibility, not detailed circuit audits.
Pros:- Reports watts, amps, volts, and cost in real time
- Includes two directional 200A current sensors
- Offers 2.4 GHz Wi-Fi and Ethernet connectivity
- MyEyedro cloud access has no subscription
Cons:- One unit cannot monitor grid energy and solar generation simultaneously
- Does not provide the circuit-level monitoring offered by the Refoss EM16P models or Siemens Inhab
- Uses a cloud service rather than the local-control approach of the Refoss monitors
Best for: Homeowners who want real-time whole-home electricity or solar readings through a cloud dashboard, without branch-circuit monitoring.
Not ideal for: Buyers who need to monitor grid use and solar simultaneously, track individual circuits, or keep readings entirely local.
- Model:EYEDRO-HOME
- Current sensor capacity:200A
- Connectivity:2.4 GHz Wi-Fi or Ethernet
- Power source:AC
- Cloud service:MyEyedro cloud access with no subscription
- Use:Indoor electricity monitoring
- Included components:Sensor module, 2 × 200A directional current sensors, 6VAC power adapter, Ethernet cable, Quick Start Guide
- Dimensions:8 × 8 × 3 in
Our verdict“Choose Eyedro for a straightforward cloud view of whole-home use or solar, but skip it if you need simultaneous grid-and-solar or circuit-level tracking.”
Emporia Vue 3 Home Energy Monitor
I’d choose this Vue 3 when solar production and net metering matter as much as household consumption. Its app tracks real-time electricity use and can add circuit-level detail with optional sensors, making it easier to spot which parts of the home account for demand. Compared with the Emporia Vue 3 bundle with 16 sensors, this version starts with a simpler setup rather than including a full set of branch sensors and smart plugs. That can suit buyers who mainly want whole-home and solar monitoring, but adding circuits later means buying sensors separately. It also depends on 2.4 GHz Wi-Fi and an internet connection, and some three-wire or three-phase setups need another sensor. I’d skip it if local data storage or an included circuit-sensor set is a priority.
Pros:- Tracks real-time household electricity use through the Emporia app
- Supports solar production and net metering monitoring
- Can expand to monitor up to 16 branch circuits with separately purchased sensors
- UL and CE listed
Cons:- Requires 2.4 GHz Wi-Fi and an internet connection
- Branch sensors are sold separately
- Some three-wire and three-phase configurations require an additional sensor
Best for: Homeowners with solar or net metering who want app-based whole-home monitoring and may add circuit sensors over time.
Not ideal for: Buyers who want circuit-level monitoring ready out of the box, local-only data, or a monitor that works without internet access.
- Model:EMV3A-2P-WH
- Connectivity:2.4 GHz Wi-Fi with internet connection
- Accuracy:±2%
- Maximum branch sensors:16; 50A sensors sold separately
- Supported systems:Single phase, single-split phase, and 2-wire; some 3-wire and 3-phase systems require an additional sensor
- Certifications:UL and CE listed
- Warranty:1 year
- Dimensions:10 x 5 x 5 inches
Our verdict“Choose this Vue 3 if solar and net-metering visibility matter more than having circuit sensors included from the start.”
Meross Smart Home Energy Monitor with Home Assistant Support
The Meross EM16 is the most compelling pick here for buyers who want Home Assistant integration and long-term local records. Its stated ±1% accuracy and storage of up to five years give it a different emphasis from the Emporia Vue 3 models, which focus on app-based monitoring and require an internet connection. The included transformers cover two 200A main circuits and up to 16 branch circuits, so there’s less need to assemble a circuit-monitoring kit separately. That breadth comes with installation work inside the electrical panel, and the unit does not support Delta systems. I’d favor it over the Emporia 16-sensor model when local storage and Home Assistant are priorities; buyers seeking solar and net-metering features should check compatibility carefully, since those capabilities aren’t specified here.
Pros:- Integrates with Home Assistant
- Stores up to five years of data locally without a subscription
- Includes transformers for two 200A mains and up to 16 branch circuits
- Offers real-time readings, usage alerts, and a two-year warranty
Cons:- Does not support Delta electrical systems
- Installation requires access to the electrical panel
- Solar and net-metering monitoring are not specified in the provided product details
Best for: Home Assistant users with a compatible electrical system who want circuit-level monitoring and several years of locally stored data.
Not ideal for: Households with Delta wiring, people unwilling to access an electrical panel for installation, or buyers specifically seeking documented solar and net-metering support.
- Model:EM16
- Main circuit capacity:2 circuits, 200A
- Branch circuit capacity:16 circuits, 60A
- Accuracy:±1%
- Data storage:Up to 5 years locally
- Compatibility:Single-phase 2-wire, split-phase 3-wire, and 3-phase 4-wire Wye; no Delta
- Integration:Home Assistant
- Warranty:2 years
Our verdict“Pick the Meross EM16 if your wiring is compatible and local records plus Home Assistant matter more than the Emporia models’ stated solar support.”
Emporia Whole-Home Energy Monitor Bundle with 16 Sensors and 4 Smart Plugs
This Emporia bundle earns its place by combining panel-level and outlet-level monitoring in one package. The Vue tracks the main panel and up to 16 individual circuits, while four smart plugs add energy tracking, remote control, and scheduling for selected appliances. Compared with the Emporia Vue 3 with 16 circuit sensors, this bundle adds the plugs, making it more useful for buyers who want to act on readings at the outlet rather than just observe them. It also supports solar net metering through the app. The tradeoff is cloud-based energy data, and the product details don’t specify installation requirements or technical limits such as accuracy and connectivity. I’d choose it for broad coverage and basic automation, but not for buyers who prioritize local storage or a clearly documented setup.
Pros:- Monitors the main panel and up to 16 individual circuits
- Includes four Wi-Fi smart plugs for outlet-level tracking and remote control
- App provides usage reports and automation features
- Supports solar net metering
Cons:- Energy data is stored in the cloud
- Product details do not provide installation guidance
- Technical details such as measurement accuracy and Wi-Fi requirements are not specified
Best for: Homeowners who want panel and circuit monitoring alongside plug-level tracking and scheduling for appliances.
Not ideal for: Buyers who require local data storage, detailed published accuracy and connectivity specifications, or installation guidance before purchase.
- Circuit monitoring:Main panel and up to 16 individual circuits
- Included sensors:16
- Smart plugs:4 Wi-Fi plugs
- App compatibility:iOS and Android
- Solar support:Solar net metering
- Compatible devices:Smart plugs, energy monitors, solar systems, iOS devices, Android devices, and Alexa-enabled devices
Our verdict“Choose this bundle over the Emporia 16-sensor monitor if four smart plugs and outlet-level tracking are part of your energy-management plan.”
Emporia Vue 3 Home Energy Monitor with 16 Circuit Sensors
For buyers who want a full circuit map without sourcing sensors separately, this Vue 3 package stands out with 16 included branch sensors alongside whole-home monitoring. It also tracks solar and net metering in the Emporia app, giving it wider energy-source visibility than the Meross EM16, whose listed strengths center on local storage and Home Assistant. The Emporia’s 2.4 GHz Wi-Fi and internet requirement makes it less attractive to people seeking local-first monitoring, and its ±2% accuracy is less precise on paper than Meross’s stated ±1%. Some three-wire and three-phase configurations also require an additional sensor. Compared with the eight-sensor Vue 3, this version is better for homes where more circuits need tracking immediately, though the one-year warranty and brief retention for one-second data may matter to detail-focused users.
Pros:- Includes 16 branch sensors for circuit-level monitoring
- Tracks whole-home use, solar, and net metering
- Provides real-time readings and app-based automation
- UL and CE listed
Cons:- Requires 2.4 GHz Wi-Fi and an internet connection
- Some three-wire and three-phase systems require an additional 200A sensor
- One-second readings are retained for only three hours and are available only while the app is open
Best for: Homeowners who want whole-home, solar, and up to 16 circuit readings with the branch sensors included.
Not ideal for: Buyers who prefer local data storage, need support for an unlisted electrical configuration, or want long retention of one-second readings.
- Model:EMV3A-2P-16
- Circuit sensors:16 branch sensors, 50A each
- Supported systems:Single phase, single-split phase, and 2-wire; some 3-wire and 3-phase systems require an additional 200A sensor
- Connectivity:2.4 GHz Wi-Fi with internet connection
- Measurement accuracy:±2%
- Certifications:UL and CE listed
- Warranty:1 year
- Dimensions:10 x 5 x 5 inches
Our verdict“Choose this 16-sensor Vue 3 over the eight-sensor version if you need broader circuit coverage immediately and accept cloud-connected monitoring.”
Emporia Vue 3 Home Energy Monitor with 8 Circuit Sensors
This eight-sensor Vue 3 is a sensible middle ground for homes that need more than a whole-panel reading but don’t have a clear use for 16 circuit clamps. It shares the same solar and net-metering support, app-based reporting, and 2.4 GHz Wi-Fi requirement as the 16-sensor Emporia model. The difference is coverage: the 16-sensor version suits a more detailed circuit map, while this package keeps the included sensor count to eight. That makes it a better match for targeting major loads first, though expanding beyond those sensors may require a separate purchase. Compared with the Emporia bundle with smart plugs, it prioritizes panel circuits rather than appliance-level outlet tracking. I’d pass if local storage is a must, since internet access is required and one-second data is retained for just three hours.
Pros:- Includes eight circuit sensors for targeted branch monitoring
- Supports real-time whole-home, solar, and net-metering monitoring
- App offers energy-management automation and usage notifications
- Cloud data can be exported
Cons:- Requires 2.4 GHz Wi-Fi and an internet connection
- Some electrical configurations need an additional sensor sold separately
- One-second data is retained for only three hours
Best for: Homeowners who want to track a handful of major circuits plus whole-home and solar use without starting with 16 sensors.
Not ideal for: Buyers who want 16 circuits monitored immediately, local-only data, or outlet-level tracking through included smart plugs.
- Model:EMV3A-2P-8
- Included sensors:8 circuit sensors
- Supported systems:Single phase, single-split phase, and 2-wire; some 3-wire and 3-phase systems require an additional sensor
- Connectivity:2.4 GHz Wi-Fi and internet connection required
- Accuracy:±2%
- Compatible devices:iPhone, Android, and web app
- Certifications:UL and CE listed
- Warranty:1 year
Our verdict“Choose the eight-sensor Vue 3 over the 16-sensor package if you only need to monitor a smaller group of major circuits.”
Meross Smart Home Energy Monitor with 18-Circuit Monitoring
The Meross EM16 earns its place for buyers who want whole-home readings plus circuit-level visibility without stopping at 16 branches: it monitors two main circuits and up to 16 branch circuits. That extra coverage can help track more individual loads than the 16-sensor SEM-Meter, while Home Assistant, Open API access, and local data storage suit people who want to build their own monitoring setup. Solar-surplus detection and alerts add useful context beyond raw wattage readings. Its stated ±2% accuracy is less precise on paper than the SEM-Meter’s 1% figure, and the Meross requires compatible panel wiring and electrical installation. It also does not support Delta systems, so buyers should check their electrical service before choosing it.
Pros:- Tracks two 200A main circuits and up to 16 branch circuits
- Supports Home Assistant, Open API access, and web control
- Stores up to five years of data and offers smart alerts
- Includes solar-surplus detection and a two-year warranty
Cons:- Does not support Delta electrical systems
- Requires compatible panel wiring and electrical installation
- Stated ±2% accuracy is lower than the SEM-Meter’s 1% specification
Best for: Homeowners with compatible wiring who want to track two main circuits and up to 16 branch circuits, especially those using Home Assistant or monitoring solar surplus.
Not ideal for: Owners of Delta electrical systems, or anyone unable to arrange safe access to a compatible electrical panel and professional installation.
- Circuit monitoring:2 main circuits (200A) and up to 16 branch circuits (60A)
- Accuracy:±2%
- Supported electrical systems:Single-phase 2-wire, split-phase 3-wire, and 3-phase 4-wire Wye with earthed neutral; no Delta
- Data storage:Up to 5 years
- Connectivity:Home Assistant, Open API, and Web Control
- Solar features:Solar-surplus detection
- Warranty:2 years
- Model:EM16
Our verdict“Choose the Meross EM16 if broad circuit coverage and Home Assistant access matter more than the SEM-Meter’s tighter stated accuracy.”
Smart Home Energy Monitor with 16 Circuit Sensors
This SEM-Meter is the stronger fit when the goal is turning circuit readings into practical electricity-cost estimates. Its app supports custom peak, off-peak, and holiday rates, while solar and net-metering monitoring can help households compare consumption with generation. The stated 1% accuracy is tighter than the Meross EM16’s ±2% specification, though the Meross covers two main circuits as well as its branch circuits. This model has 16 clamp-on sensors and can operate locally through MQTT, but that route requires Home Assistant and an MQTT server; it is not a plug-and-play local option. Historical exports are also mixed: hourly data is available for 90 days, while longer-period exports remain available permanently. Installation depends on panel access and compatible wiring.
Pros:- Includes 16 clamp-on sensors for circuit-level monitoring
- Calculates costs using customizable peak, off-peak, and holiday rates
- Supports solar and net-metering monitoring
- Offers local MQTT operation without cloud access when paired with Home Assistant
Cons:- Local MQTT operation requires Home Assistant and an MQTT server
- Does not support Delta electrical systems
- Hourly exports cover only 90 days, and installation may require separately available flexible sensors for some panels
Best for: Households with time-of-use electricity rates or solar net metering that want circuit-level readings translated into estimated costs, and have the setup to run Home Assistant with MQTT if needed.
Not ideal for: Buyers who need 18-circuit monitoring, Delta-system compatibility, or local operation without configuring Home Assistant and an MQTT server.
- Circuit sensors:16 × 50 A clamp-on sensors
- Voltage support:Up to 240 VAC line-neutral, 120/240 VAC split-phase, and 415Y/240 VAC three-phase; no Delta
- Accuracy:1%
- Connectivity:2.4 GHz Wi-Fi; local MQTT mode requires Home Assistant
- Data history:Hourly exports for 90 days; daily, monthly, and yearly exports permanent
- Solar features:Solar and net-metering monitoring
- Dimensions:3.1 × 1.2 × 4.18 inches
- Warranty:1 year
- Model:SEM-Meter
Our verdict“Pick the SEM-Meter for detailed rate-based cost estimates and solar tracking, provided its panel requirements and local-server setup suit your home.”
How We Picked
I ranked these home energy monitors by how well their stated capabilities answer common buyer needs: whole-home measurement, circuit-level visibility, and practical smart-home integration. I gave weight to the number and type of sensors included, connection options such as Wi-Fi or Ethernet, and whether a product emphasizes local control, an open API, or Home Assistant support. Bundles with additional smart plugs were judged for the extra device-level detail they offer, not simply for having more accessories.
The order reflects usefulness across a range of homes, clarity about what comes in the box, and the tradeoff between setup effort and monitoring detail. A high sensor count can be valuable, but it does not automatically make a monitor the best choice if a buyer only needs whole-home readings or cannot use the integrations offered. Product names and listed features do not establish compatibility with every electrical panel, so I treat panel fit and installation requirements as checks buyers should make before purchase.
Factors to Consider When Choosing Home Energy Monitors
Before choosing among these models, decide what you want the data to help you change. A monitor can show total household use, identify demand on selected circuits, or connect readings to a broader smart-home setup; those goals call for different hardware and setup effort.
Choose Whole-Home Readings or Circuit-Level Detail
Whole-home monitoring gives a useful baseline for total consumption, while circuit sensors can help pinpoint where that use comes from. If your main question is whether household consumption rises at certain times, a whole-home view may be enough. If you want to compare heating, cooling, laundry, or other loads, circuit-level data is more informative. A common mistake is buying the highest sensor count without deciding which circuits matter; not every panel has a one-to-one sensor plan for every appliance. Make a short list of the loads you want to track, then check whether the included sensors and panel layout can support that plan.
Check Panel Compatibility and Installation Before Buying
These monitors connect to electrical equipment, so compatibility is more than a software question. Check the product’s supported service type, current rating, sensor dimensions, and panel requirements against your home’s setup. Also consider whether your panel has space for sensors and whether the installation calls for a qualified electrician. Do not assume a 16- or 18-circuit label means the device fits every panel or can monitor every branch circuit in the same way. If you cannot verify fit from the product documentation, ask the manufacturer or an electrician before ordering.
Decide How Much Smart-Home Integration You Actually Need
Home Assistant support, an open API, and local control can make energy data more useful for custom dashboards or automations. Those features matter most if you already maintain a smart-home system and are comfortable configuring integrations. Buyers who mainly want readings in a manufacturer’s app may not benefit from paying extra attention to advanced integration claims. Cloud-connected services can be easier to start with, while local options may give more control but call for more setup and troubleshooting. Confirm which data is available through the integration you plan to use, rather than relying on a general compatibility label.
Compare the Included Bundle, Not Just the Product Name
Several products in this roundup appear in versions with different sensor counts, and one Emporia bundle adds four smart plugs. Those variations affect what you can measure right away, so compare the exact package contents before choosing. Circuit sensors are suited to panel-level loads, while smart plugs can provide readings for individual plug-in devices. A larger bundle can reduce the need to add accessories later, but it may include equipment you will not use. Match the included hardware to your monitoring plan instead of treating every version of a product family as interchangeable.
Choose Wi-Fi, Ethernet, or Local Control Around Your Network
Connection choices shape reliability and how the monitor fits into your home network. Eyedro lists both Wi-Fi and Ethernet, which gives buyers a choice between wireless placement and a wired connection where the panel location allows it. Other models emphasize local control or integrations, which can suit people who want their readings available within a smart-home system. Check whether your electrical panel has dependable network coverage and whether an Ethernet cable can reach it. A feature list cannot compensate for a weak connection at the installation point, so plan the network path as part of the purchase.
Set Expectations for Data and Decisions
An energy monitor reports usage; it does not automatically explain every bill change or identify every appliance. Readings are most useful when you compare patterns over time and relate them to changes in household routines, weather, or equipment use. Circuit labels and data organization also affect how quickly you can make sense of the results. Buyers sometimes expect a monitor to produce savings on its own, but the benefit depends on acting on what the measurements reveal. Choose a model whose level of detail you will actually review, rather than collecting more data than you can use.
Frequently Asked Questions
Do I need circuit sensors, or is whole-home monitoring enough?
Whole-home monitoring is a sensible start if you want to track total household demand and spot broad changes in usage. Circuit sensors add value when you need to separate major loads and learn which parts of the home account for a pattern. They also require more panel planning, and the included count may not cover every circuit you care about. Decide which decisions you hope to make from the data before choosing a sensor-heavy bundle. If you cannot name the circuits you want to investigate, whole-home readings may meet your needs with less setup.
Can I install one of these monitors myself?
Installation depends on the product, your electrical panel, and your comfort with electrical work. These devices connect at the panel, where safety and correct sensor placement matter, so buyers should follow the manufacturer’s installation guidance and local rules. A high sensor count can add installation steps and make panel fit more important. If you are unsure about the panel layout or working around live electrical equipment, hire a qualified electrician. Confirm installation requirements before buying so the monitor does not arrive with a setup plan you cannot safely complete.
Will Home Assistant support or an open API work with my setup?
Support labels do not always mean every feature or data point is available in the same way. Check the product documentation and integration details for your specific Home Assistant version, connection method, and desired readings. Refoss EM16P highlights an open API, while several other models name Home Assistant support, but the implementation and setup can differ. Consider whether you are comfortable maintaining integrations if an update changes how data is shared. If you mainly need straightforward monitoring, an app-based workflow may be a simpler fit.
Should I choose an 8-, 16-, or 18-circuit model?
Choose based on the circuits you plan to monitor, not the largest number printed in the model name. An 8-sensor option may suit a home where only a handful of major loads need attention, while 16- or 18-circuit versions offer more potential coverage. Extra sensors are useful only if they fit your panel and correspond to circuits you want to understand. Check which sensors are included in the exact bundle, since product families can have multiple configurations. Leave room in your decision for installation layout and any circuits that cannot be monitored as expected.
Are smart plugs a substitute for circuit sensors?
No; they answer different monitoring questions. Circuit sensors measure selected electrical circuits at the panel, while smart plugs are designed to report use by compatible plug-in devices. The Emporia bundle with four smart plugs can add device-specific visibility for equipment connected through those plugs, but it will not replace panel coverage for built-in loads. Check the plug’s compatibility and ratings before using it with an appliance. If your priority is tracking fixed equipment or whole branches, focus on the circuit sensors instead.
Conclusion
For the broadest fit across detailed monitoring needs, I recommend the Emporia Vue 3 with 16 Circuit Sensors as the best overall choice. Buyers seeking a lower-complexity starting point can look at the Emporia Vue 3 with 8 Circuit Sensors as a value-oriented option, while the Eyedro 200A suits people who prioritize whole-home readings and a choice of Wi-Fi or Ethernet. For beginners, start with the setup and sensor count you can use comfortably rather than paying attention to the largest bundle. The premium-style pick for added device-level insight is the Emporia bundle with 16 sensors and four smart plugs; for specific smart-home needs, compare the Refoss EM16P, Sungrass eMonHub, and Meross Home Assistant models by the integrations and control method you intend to use. Check panel compatibility and package contents before placing an order, since those details can matter more than a model-family name.
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