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Shelly EM / Pro 3EM Energy Monitor
Shelly (Allterco) · EU (Bulgaria)
Ready-made CT energy monitors with a local API. Pro 3EM = 3-phase DIN-rail meter, 1% accuracy, per-phase V/A/PF in real time, 60-day on-device history.
Data out
Local HTTP + MQTT (no cloud required) · WiFi; Pro models add LAN + Bluetooth
Price
EM €60–80 · Pro EM-50 €75–90 · Pro 3EM €100–130
- 110 EUR — Pro 3EM typical EU street price
Sourcing
- Shelly EU shop / AliExpress · 1–3 weeks to TH — no official TH store found
Links
Gotchas
- True kWh needs the L/N voltage tap at the meter terminals — the current side stays clip-on
- CT polarity matters for power direction
- Metal cabinets kill WiFi — use the Pro models on LAN for deployments