Device Comparison
HomeWizard kWh Meter 1-Phase vs HomeWizard Wi-Fi kWh Meter 1-Phase vs Shelly EM vs Shelly EM Gen3
A single-phase home monitoring comparison for buyers choosing between compact retrofit-friendly meters with app and smart-home options.
Free Compare
Build your own comparison
Which To Choose
Start with the practical fit, then read the table.
HomeWizard kWh Meter 1-Phase
Best fit when single-phase, solar import/export visibility, and local dashboards and Home Assistant.
HomeWizard Wi-Fi kWh Meter 1-Phase
Best fit when single-phase, solar import/export visibility, and local dashboards and Home Assistant.
Shelly EM
Best fit when single-phase, two-channel monitoring, solar import/export visibility, and local dashboards and Home Assistant.
Shelly EM Gen3
Best fit when single-phase monitoring, with two current measurement channels, solar import/export visibility, and local dashboards and Home Assistant.
Use this comparison when the install is single-phase and the real choice is between simple app visibility, Wi-Fi convenience, and local automation flexibility.
At A Glance
Key fit signals before the full table
A quick pass over the most decision-shaping details for each device in this featured comparison.
HomeWizard kWh Meter 1-Phase
- Phase
- Single-phase
- Installation
- Single-phase DIN-rail direct-connected kWh meter for installation after the circuit breaker on a 35 mm DIN rail.
- Measurement
- Direct-connected single-phase import/export kWh and power meter for monitored circuits, solar panels, EV chargers, heat pumps, or the main connection.
- Max current
- 100 A
HomeWizard Wi-Fi kWh Meter 1-Phase
- Phase
- Single-phase
- Installation
- 35 mm DIN-rail mounted direct-connected meter for a circuit, solar inverter, EV charger, heat pump, or main single-phase feed.
- Measurement
- Single-phase bidirectional kWh meter for import/export energy, active power, voltage, current, frequency, and production/consumption monitoring.
- Max current
- 100 A
Shelly EM
- Phase
- Single-phase, two-channel monitoring
- Installation
- Wall box / electrical cabinet / near-appliance retrofit with external current transformers
- Measurement
- Single-phase two-channel CT energy meter
- Max current
- 80 A
Shelly EM Gen3
- Phase
- Single-phase monitoring, with two current measurement channels
- Installation
- Retrofit in a wall box or electrical cabinet with external CT clamps; qualified electrical installation is recommended.
- Measurement
- Two-channel CT energy meter with import/export-capable measurements
- Max current
- 80 A
Before You Decide
Checks that matter before price.
- Confirm your supply type first: single-phase, split-phase, or three-phase.
- Decide whether DIN-rail wiring, CT clamps, or utility-meter access fits your switchboard.
- Choose between cloud convenience and local data access before comparing prices.
- For solar homes, make sure import, export, and load readings are measured at the right point.
| Install fit | ||||
|---|---|---|---|---|
| Phase support | Single-phase | Single-phase | Single-phase, two-channel monitoring | Single-phase monitoring, with two current measurement channels |
| Installation | Single-phase DIN-rail direct-connected kWh meter for installation after the circuit breaker on a 35 mm DIN rail. | 35 mm DIN-rail mounted direct-connected meter for a circuit, solar inverter, EV charger, heat pump, or main single-phase feed. | Wall box / electrical cabinet / near-appliance retrofit with external current transformers | Retrofit in a wall box or electrical cabinet with external CT clamps; qualified electrical installation is recommended. |
| Measurement | Direct-connected single-phase import/export kWh and power meter for monitored circuits, solar panels, EV chargers, heat pumps, or the main connection. | Single-phase bidirectional kWh meter for import/export energy, active power, voltage, current, frequency, and production/consumption monitoring. | Single-phase two-channel CT energy meter | Two-channel CT energy meter with import/export-capable measurements |
| Max current | 100 A | 100 A | 80 A | 80 A |
| Nominal voltage | Unknown | Unknown | Unknown | 110-240 V AC |
| Meter fit | ||||
| Accuracy class | Class B (MID) | Class B (MID) | Voltage +/-2%; current +/-2% from 1-50 A and +/-5% below 1 A | Voltmeter accuracy ±2%; ammeter accuracy ±2% from 1-50 A and ±5% below 1 A |
| Current sensing | Direct inline measurement up to 100 A; no external CT clamps. | Direct-connected single-phase DIN-rail kWh meter; no external CT required. | 1 x 50A CT included; supports up to 2 CTs total, with optional additional CT50A or CT80A | Two CT inputs; one 50 A CT is included and Shelly lists 50 A and 80 A compatible CTs. |
| Monitoring | ||||
| Protocol | Wi-Fi / Local API | Wi-Fi / Local API (JSON) / HTTPS / WebSocket | Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / RPC | Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / RPC |
| Local API | Yes | Yes | Yes | Yes |
| Cloud dependency | Optional for local API and Home Assistant; required for the app, remote history and firmware updates. | Optional cloud; local API and Home Assistant work without it. Disabling cloud also disables the app and firmware updates. | Optional cloud; local web, automation, APIs and at least 10 days of 1-minute logs work without Shelly Cloud. | Optional cloud; local web UI, scripting, RPC, MQTT and WebSocket work on the local Wi-Fi network. |
| Home Assistant | Yes | Yes | Yes | Yes |
| Solar fit | ||||
| Solar import/export | Yes | Yes | Yes | Yes |
| Buying context | ||||
| Price range | About EUR 30-EUR 60 | About EUR 59.95 | Unknown | About $50-$90 |
| Availability | Europe, UK, and selected European HomeWizard store markets. | HomeWizard official international / EU store regions; availability and electrical suitability depend on country, stock, and local DIN-rail installation rules. | EU store / USA store / region-dependent Shelly availability | United States and Europe via official Shelly stores; wider availability varies by regional distributor and electrical-market fit. |
| Source check | ||||
| Last verified | Aug 21, 2026 | Aug 17, 2026 | Sep 1, 2026 | Aug 23, 2026 |
| Product page | Official page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs | Official docs |
Verdict
Choose HomeWizard for simpler app-led monitoring, and Shelly when Home Assistant, MQTT, and broader local automation options matter more.
FAQ
Common decision questions.
Which energy meter should I choose?
Choose the option that matches your installation constraints and data path first. For 4 energy meter options, the full table is most useful after you know whether local data access, cloud convenience, backup behavior, solar visibility, or expansion matters most.
What should I check before comparing prices?
Check installation fit, required accessories, official documentation, monitoring platform support, and any unknown fields in the source-checked table. Price is only useful once those constraints are clear.
Can these devices work with local dashboards or Home Assistant?
HomeWizard kWh Meter 1-Phase, HomeWizard Wi-Fi kWh Meter 1-Phase, Shelly EM, Shelly EM Gen3 list Home Assistant support in the catalog. HomeWizard kWh Meter 1-Phase, HomeWizard Wi-Fi kWh Meter 1-Phase, Shelly EM, Shelly EM Gen3 are marked with local API support. Confirm firmware, region, and integration maturity before treating this as a final compatibility guarantee.
Are unknown fields a reason to avoid a device?
Not always. Unknown means the field was not confirmed from the reviewed source data. Treat it as a question for the installer, reseller, or manufacturer before making a purchase decision.
Does the verdict replace the specification table?
No. The verdict is a practical shortcut. Use the table to confirm the exact constraints that matter for your home, especially installation, monitoring, and support details.