Device Overview
The Refoss EM16P is a panel-installed, CT-based energy monitor for homes that need more detail than a single whole-home meter can provide. It combines two high-current main sensors with sixteen branch-circuit sensors, so it can show total consumption, individual circuit loads, and solar or feed-in behavior when the wiring and configuration support it.
This page is scoped as an energy meter. It is not a solar inverter, battery, EV charger, or standalone gateway. Its value is in measurement, local data access, Home Assistant fit, and circuit-level visibility.
Core Metering Fields
Refoss lists the EM16P as supporting up to 18 monitored circuits: two main circuit sensors up to 200 A each and sixteen branch circuit sensors up to 60 A each. That makes maxCurrentAmps useful for buyer filtering, because a 200 A main-sensor limit is suitable for many North American residential panels but still needs to be checked against the actual service and conductor layout.
The stored accuracyClass is a measurement-accuracy note, not a billing-grade meter class. Refoss publishes measurement accuracy within +/-2%, which is useful for home energy insight and automation but should not be treated as utility billing certification.
Installation And Electrical Fit
The product page positions EM16P for single-phase 2-wire, split-phase 3-wire, and 3-phase 4-wire Wye systems with grounded neutral, while explicitly excluding Delta systems. It belongs inside the electrical-panel workflow, so buyers should plan around panel space, CT routing, safe breaker-panel access, and local electrical-code requirements.
The CT layout matters. A buyer who only wants total home consumption may not need sixteen branch sensors, while a Home Assistant user trying to isolate EV charging, HVAC, kitchen circuits, or solar/export behavior may benefit from the fuller channel count.
Local Data, Cloud, And Home Assistant
The EM16P stands out because Refoss markets it as an Open API product. The official product page and Open Platform material describe local Web access, Refoss Open API, MQTT, and app-free/offline operation. Refoss cloud/app history can still be useful for remote charts and stored history, but this record treats the core local-data path as available.
Home Assistant support is marked true from Refoss's EM16P product positioning and the broader Refoss/Home Assistant documentation context. The source note intentionally preserves the nuance that Home Assistant's core Refoss page currently lists EM16, while the EM16P product page points buyers toward OpenClaw/Home Assistant support. Buyers who require a specific integration path should verify the current firmware and integration route before purchase.
Solar And Feed-In Use
Refoss describes the EM16P as solar PV monitoring ready and highlights consumption/feed-in statistics and zero-feed-in automation scenarios. For EnergyMeterHub comparison purposes, supportsSolarImportExport is therefore true. The practical result still depends on CT placement, merged-channel setup, inverter/export wiring, and the automation platform used to act on surplus production.
Buying Notes
During the 2026-06-08 review, the official Refoss store page showed a $159.99 sale price and backorder / more-stock-coming wording. Because availability can change quickly, treat the purchase link as a current official route rather than a guaranteed in-stock listing.