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Refoss Open API Smart Energy Monitor EM16P vs Aeotec Home Energy Meter

Install fit
Phase support Single-phase 2-wire, split-phase 3-wire, and 3-phase 4-wire Wye systems with grounded neutral; not for Delta systems. Region-specific 1-phase, 2-phase / split-phase, and 3-phase ZW095 variants.
Installation Indoor electrical-panel CT installation with clamp-on main and branch-circuit sensors. Electrical-panel clamp-meter installation; US versions use plug-in power and EU versions are wired in. Licensed-electrician installation recommended.
Measurement CT-based whole-home and circuit-level energy monitor with consumption, feed-in, voltage, current, power, power factor, and energy statistics. Clamp-based Z-Wave whole-home energy meter for consumption and solar / generator overproduction monitoring.
Max current 200 A 200 A
Meter fit
Accuracy class +/-2% measurement accuracy Over 99% measurement accuracy when current is greater than 0.05 A
Current sensing 2 main CT sensors up to 200 A each plus 16 branch-circuit CT sensors up to 60 A each. ZW095 clamp SKUs: US 2-clamp 200 A version; EU 1-clamp 60 A and 3-clamp 60 A variants.
Monitoring
Protocol Wi-Fi / local Web UI / Refoss Open API / MQTT / Home Assistant Z-Wave Plus
Local API Yes Yes
Cloud dependency Can operate offline with local Web access, Refoss Open API, and MQTT; Refoss app/cloud storage is optional for remote app charts and long-term history. No Aeotec cloud is required; the meter reports locally over Z-Wave to a compatible gateway. Remote app/cloud behavior depends on the chosen hub.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability United States and Canada through Refoss official online store; broader availability depends on regional store and reseller channels. Global / region-specific Aeotec Z-Wave SKUs; availability depends on local Aeotec retailer or distributor stock.
Source check
Last verified Jun 8, 2026 Jun 8, 2026
Product page Official page Official page
Documentation Official docs Official docs
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