Sonoff
Sonoff POW Elite POWR320D
- Wi-Fi
Verified September 2026
This is a 20A in-line wired switch, not a plug — it's wired directly into the circuit it monitors, typically an immersion heater or another hardwired appliance. That's mains-wiring work, realistically electrician territory for anything permanent, unlike a £15 plug-in energy monitor you just plug in and forget. The trade-off buys you whole-circuit monitoring a plug-in device can't offer, plus an on-device LCD for at-a-glance power, voltage and current without opening Home Assistant. Works locally via the SonoffLAN HACS integration, and the ESP32 inside is ESPHome-flashable if you want eWeLink out of the picture entirely.
In Home Assistant
| Control | Type | What it does |
|---|---|---|
| Switch | Switch | Relay on/off, controlled locally via SonoffLAN when LAN mode succeeds, or over cloud as a fallback if local commands fail. |
| Power | Sensor (W) | Real-time active power from the onboard CSE7766 chip; confirm SonoffLAN is updated to avoid the known scaling bug reported on this model. |
| Voltage | Sensor (V) | Live mains voltage reading, same source and scaling caveat as the power sensor. |
| Current | Sensor (A) | Live current draw, useful for near-zero-current detection (e.g. finished appliance cycle) since it updates faster than cumulative energy. |
| Energy | Sensor (kWh) | Total consumption; reported as sometimes lagging until the eWeLink app has been opened at least once to trigger a push update. |
SonoffLAN pulls live power, voltage and current straight off the device's CSE7766 metering chip, but early releases misparsed the POWR320D's payload and reported values 100x too high — fixed from SonoffLAN v3.2.0, so update the HACS integration before trusting the numbers. A separate reported issue shows local switch commands sometimes bouncing with an encrypt mismatch even though local polling and cloud control both work fine, so a LAN-only setup can occasionally need an eWeLink cloud fallback for reliable on/off. If you flash ESPHome instead, the community template drives the bistable relay from two GPIO pins and reads the CSE7766 chip over a third, but flashing over 3.3V DC rather than mains AC has caused reported boot loops on this specific board.
Specs
- wifi
- 802.11 b/g/n, 2.4GHz
- display
- LCD showing power/voltage/current
- max load
- 20A
- plug type
- n/a (in-line wired switch)
- dimensions mm
- 98 x 54 x 31
- voltage rating
- 100-240V AC, 50/60Hz
- casing material
- PC, V0 flame-rated
- energy monitoring
- true