Tuya Smart WiFi Energy Clamp Meter

1. Product Overview

The Tuya Smart WiFi Energy Clamp Meter (Model PJ-1103C) is a smart device designed to monitor electricity consumption and generation in real-time. It features bidirectional measurement, app-based monitoring, and a buzzer alarm for threshold alerts. This device integrates with the Tuya Smart and Smart Life applications, providing comprehensive energy data and control.

Figure 1: Tuya Smart WiFi Energy Clamp Meter (PJ-1103C) with two current transformers.

2. Setup Guide

2.1. Download the Application

The device operates with either the Smart Life or Tuya Smart application. Download your preferred app from your device's app store:

• For iOS: Search for 'Smart Life' or 'Tuya Smart' in the Apple App Store.
• For Android: Search for 'Smart Life' or 'Tuya Smart' in the Google Play Store or Android Market.

Alternatively, you can scan the QR codes provided in the original product documentation to directly download the apps.

2.2. Add the WiFi Meter to the App

1. Ensure your mobile device is connected to a 2.4 GHz Wi-Fi network. This device does not support 5 GHz Wi-Fi.
2. Power on the WiFi Energy Clamp Meter.
3. Press and hold the reset button on the device for approximately 5 seconds until the red indicator light flashes quickly. This indicates the device is in pairing mode.
4. Open the Smart Life or Tuya Smart app on your mobile device.
5. Tap 'Add Device' or the '+' icon. The app should automatically discover the 'WiFi dual meter' or similar device. If not, select 'Electrical' > 'Smart meter (Wi-Fi)' manually.
6. Follow the on-screen prompts to connect the device to your 2.4 GHz Wi-Fi network by entering your Wi-Fi password.
7. Once successfully added, tap 'Done'. You can now monitor electricity usage through the app.

2.3. Wiring Diagram and Installation

WARNING: Installation should only be performed by qualified electrical personnel. Ensure all power is turned off at the main breaker before proceeding with any wiring.

2.3.1. Wiring for Energy Consumption and Generation Measurement

This configuration is used to monitor both power drawn from the grid (consumption) and power fed back into the grid (generation), typically from solar panels.

Figure 2: Wiring diagram for measuring energy consumption and generation.

• Connect the 'L' (Live) and 'N' (Neutral) terminals of the meter to your AC power supply (100-240V).
• Connect Current Transformer 1 (CT1) to terminals S1 and S2 for Channel A. Clamp CT1 around the live wire of the circuit you wish to monitor for consumption (e.g., main load).
• Connect Current Transformer 2 (CT2) to terminals S1 and S2 for Channel B. Clamp CT2 around the live wire of the circuit you wish to monitor for generation (e.g., solar inverter output).

2.3.2. Wiring for 'From Grid' or 'To Grid' Measurement

This configuration is used to specifically monitor the net energy flow between your premises and the main electrical grid.

Figure 3: Wiring diagram for measuring energy flow from/to the grid.

• Connect the 'L' (Live) and 'N' (Neutral) terminals of the meter to your AC power supply (100-240V).
• Clamp the Current Transformer(s) around the live wire(s) of the main incoming power line from the grid.

Important Note for Wiring:

When installing, please ensure that the circuit measured by the Current Transformer (CT) is in the same phase as the circuit powering the meter module.

2.4. Correct Clamp Direction

The direction of the current transformer clamp is crucial for accurate readings (generating vs. consuming power). After installation, verify the clamp direction in the app:

1. If your solar system is actively generating power, adjust the clamp's direction until the app displays 'Generating power'.
2. If your solar system is not generating (or you are only consuming), adjust the clamp's direction until the app displays 'Consuming energy'.
3. Perform this verification for each channel (CT clamp) installed.

Figure 4: App interface showing 'Generating power' (Reverse) and 'Consuming energy' (Forward) based on clamp direction.

3. Operating Instructions

3.1. Monitoring Electricity Usage

Once connected, the app provides real-time and historical data:

• Total Forward Energy: Total energy consumed.
• Total Reverse Energy: Total energy generated/exported.
• Voltage (V): Current line voltage.
• Total Power (W): Instantaneous total power.
• Frequency (Hz): Line frequency.
• Channel A/B: Detailed readings for each CT clamp, including Active Power (W), Current (mA), and Power Factor.

3.2. Energy Data History

The app allows you to view energy consumption and generation data over different periods:

• Daily View: Shows energy trends throughout the day.
• Monthly View: Provides a summary of energy usage/generation for the month.
• Yearly View: Displays annual energy performance.

3.3. Buzzer Warning and Alarm Settings

The device features a built-in buzzer and app notifications to alert you when monitored parameters exceed predefined thresholds.

1. Navigate to the 'Setting' section within the device interface in the app.
2. Buzzer: Toggle the 'Buzzer' option to enable or disable the audible alarm on the device.
3. Alarm Settings: Configure various thresholds:
• Over power threshold (A/B)
• Over voltage threshold
• Under voltage threshold
• Over current threshold (A/B)
4. When any set threshold is exceeded, the device buzzer will sound (if enabled), and the app will send an alarm message.

Figure 5: App interface displaying buzzer warning and over-current alarm.

Figure 6: App interface for configuring alarm thresholds and report rate.

3.4. Report Rate Setting

You can adjust how frequently the device reports data to the app:

1. In the 'Setting' section, tap 'Report rate setting'.
2. Select your desired reporting interval (e.g., 10 seconds).
3. Tap 'Confirm' to save the setting.

4. Maintenance

4.1. Clearing App Electricity Data

To reset or clear all accumulated electricity data from the app:

1. Quickly press the reset button on the device 5 times. The indicator LED will blink quickly. If it fails to blink, repeat the action until it does.
2. Wait for approximately 10 seconds.
3. In the Smart Life or Tuya Smart app, navigate to the device's settings page.
4. Scroll down and tap 'Disconnect and wipe data'. Confirm your action.

5. Troubleshooting

5.1. App Shows Current and Power as '0'

Q: After I configure it with the App, why does the App show 'the Current and Power as '0''?

A: The current transformer (clamp) needs to sense current flow. Ensure that only one wire (either the live wire or the neutral wire, but not both) is placed inside the clamp. Then, turn on the electrical device being monitored. The clamp will then sense the current, and the App will display current and power values.

5.2. App Appears Stuck After Changing Report Rate

Q: After I change the report rate to less than 10 seconds, why does my App seem stuck?

A: This usually indicates that the network return is too slow. Please sign out of the App and then sign back in. Change the report rate back to 10 seconds, and it should function correctly.

5.3. Home Assistant Compatibility

While some users report success, direct compatibility with Home Assistant can vary. It is generally recommended to use the 'Tuya Local' integration (available via HACS) for better integration and local control, rather than relying solely on the Tuya cloud integration.

5.4. ESPHome Flashing

This device is typically not based on ESP (ESP8266/ESP32) modules, meaning it cannot be flashed with ESPHome firmware.

6. Specifications

Figure 7: Dimensions of the PJ-1103C module and current transformer.

7. User Tips

• App Choice: For potentially more features and unlocked graphs, some users recommend using the 'Tuya Smart' app over 'Smart Life', as certain graph functionalities might be paid in 'Smart Life'.
• Clamp Direction: Always double-check the clamp direction in the app to ensure it correctly displays 'Generating power' or 'Consuming energy' for accurate readings.
• Safety First: The indirect measurement method using split-core current transformers is inherently safe as it does not require interrupting the main power supply during setup or operation. However, always exercise caution and follow safety guidelines.
• Accuracy: The device generally provides accurate readings. If needed, voltage can be calibrated within the app using an offset adjustment feature to match readings from a multimeter.
• Data Update Rate: The device typically updates data every 3 seconds at its maximum report rate.

8. Safety Warnings

8.1. Safety Installation

WARNING: Failure to follow these instructions may result in death or serious injury.

• The power clamp must be installed and serviced only by a qualified electrical personnel.
• Do not touch the terminals of the device during testing.
• Turn off all power supply for this equipment at the main breaker before installing or servicing.
• Make sure that the power supply is off before connecting or disconnecting it to an auxiliary device.
• Always use a properly rated voltage sensing device to confirm power is off before working on electrical circuits.

DANGER ELECTRIC SHOCK

8.2. Safety Handling

WARNING: Failure to follow these safety notices could result in fire, electric shock, other injuries, or damage to the Power Clamp and other property. Read all the safety notices below before using the Power Clamp.

• Avoid high humidity or extreme temperatures.
• Avoid long exposure to direct sunlight or strong ultraviolet light.
• Do not drop or expose the unit to intense vibration.
• Do not disassemble or try to repair the unit on your own.
• Do not expose the unit or its accessories to flammable liquids, gases, or other explosives.

8.3. Uninstalling the Clamp

WARNING: FOR SAFETY. If you need to remove the current transformer clamp, please be sure to turn off the power to the measuring device and the circuit being monitored first, otherwise there is a risk of electric shock.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the seller's terms of service or contact the point of purchase. Keep your purchase receipt as proof of purchase.