US Smart Power Monitor (No Relay Version)
ESPHome US Plug-In Energy Monitor, ESP8285 Wi-Fi, HLW8032 Power Meter, Relay-Free Always-On Design
Monitor Power Without Switching It Off
This ESPHome plug-in power monitor is made for devices that need to stay powered continuously.
It has no built-in relay, so it is not a smart switch and cannot remotely turn an appliance on or off. Instead, it provides energy monitoring while keeping the power path continuously connected under normal operating conditions.
It is an excellent choice for monitoring the power consumption of refrigerators, NAS devices, routers, modems, network switches, home servers, security systems, and other equipment where unexpected shutdowns are not acceptable.
Core Features
ESP8285 built-in Wi-Fi chip
HLW8032 energy metering chip
ESPHome compatible
Home Assistant compatible through ESPHome
Relay-free, monitoring-only design
No remote ON/OFF control
Continuous-power design for always-on equipment
US Type A/B plug format
Supports local Wi-Fi monitoring and automation
Designed for Critical Always-On Devices
Traditional smart plugs use a relay to control power. An incorrect automation, accidental command, relay failure, or firmware setting may switch the connected device off.
This product has no relay, so it does not intentionally cut power to the connected device.
Ideal for:
Refrigerator and freezer monitoring
NAS and home server power tracking
Router and modem monitoring
Network switch and access point monitoring
CCTV and security system monitoring
Smart-home hub monitoring
Computer and office equipment energy tracking
Note: The relay-free design does not protect against grid outages, tripped breakers, damaged wiring, or other external power failures.
Real-Time Energy Monitoring
The integrated HLW8032 metering chip can provide useful electrical data in ESPHome or Home Assistant.
Available measurements may include:
Voltage
Current
Real-time power
Total energy consumption
Device operating status based on power draw
Monitoring values may vary depending on load conditions, calibration, ESPHome configuration, and local electrical conditions.
ESPHome and Home Assistant
This monitor is designed for users who prefer local smart-home control.
After ESPHome setup, you can add the device to Home Assistant to view energy data, create dashboards, track consumption history, and build automations based on appliance power usage.
Example uses:
Receive an alert when a refrigerator stops drawing power
Check whether a NAS or router is running
Track the daily energy use of a home server
Monitor power consumption without giving automations the ability to switch equipment off
Specifications
| Item | Details |
|---|---|
| Product Type | Plug-in energy monitor |
| Plug Type | US Type A/B |
| Wi-Fi Chip | ESP8285(2MB Flash) |
| Energy Metering Chip | HLW8032 |
| Firmware Support | ESPHome |
| Home Assistant Support | Yes, via ESPHome |
| Relay | No relay installed |
| Remote Power Switching | Not supported |
| Main Function | Voltage, current, power, and energy monitoring |
| Voltage | 100～250V AC, 50Hz/60Hz |
| Current | 16A |
Package Includes
1 × ESPHome US Plug-In Energy Monitor
Safety Notice
This product is for energy monitoring only; it is not a remote power switch.
Use only with a compatible US outlet and correctly rated electrical circuit.
Do not exceed the rated voltage, current, or power.
Keep dry and away from excessive heat.
Do not use with a damaged outlet, plug, cable, or enclosure.
Do not disassemble or modify the product unless qualified to work with mains electricity.
Follow all applicable local electrical codes and safety requirements.
FAQ
Does this product have an ON/OFF function?
No. It does not include a relay and cannot switch connected equipment on or off.
Why is a no-relay design useful?
It helps ensure that smart-home automations cannot intentionally shut down your connected equipment.
Can I monitor a refrigerator, NAS, or router?
Yes. It is designed for monitoring equipment that should remain powered continuously.
Can I use it with Home Assistant?
Yes. Configure it with ESPHome, then add it to Home Assistant.
What can it measure?
Depending on configuration, it can measure voltage, current, power, and accumulated energy.
Can it prevent a power outage?
No. It prevents relay-based switching only. It cannot prevent utility outages, breaker trips, or external electrical faults.
