SONOFF S31 WiFi Smart Plug User Manual

1. Introduction

The SONOFF S31 WiFi Smart Plug is a compact and intelligent outlet designed to bring convenience and energy efficiency to your home. With features like energy monitoring, voice control, and remote access, it allows you to manage your electronic devices from anywhere. This manual provides detailed instructions for setting up, operating, and maintaining your S31 Smart Plug.

SONOFF S31 WiFi Smart Plug with energy monitoring app interface

Figure 1: SONOFF S31 WiFi Smart Plug and its accompanying eWeLink app interface showing energy consumption data.

2. Safety Information

Please read all safety warnings and instructions carefully before using this product to ensure safe operation and prevent damage. Keep this manual for future reference.

The SONOFF S31 Smart Plug is ETL/FCC/RoHS certified, ensuring compliance with safety and environmental standards.
It features overload protection. You can set threshold values for power, current, and voltage within the app to ensure connected devices operate safely and prevent potential hazards like overheating or fire.
Maximum rated current: 15A. Maximum power: 1800W. Do not exceed these limits.
Ensure the plug is fully inserted into a standard 120V outlet.
Do not disassemble or modify the device.
Keep out of reach of children.

SONOFF S31 Smart Plug safety features including ETL certified, overload protection, 15A max current, and V-0 rating PC fire-resistant shell

Figure 2: Key safety features of the SONOFF S31 Smart Plug, highlighting its certifications and protective mechanisms.

3. Product Features

The SONOFF S31 Smart Plug offers a range of features to enhance your smart home experience:

Remote Control: Manage electronic devices from anywhere using the eWeLink app.
Voice Control: Compatible with Amazon Alexa and Google Home for hands-free operation.
Power Consumption Monitoring: Track real-time power, current, and voltage of your appliances. Store up to 100 days of electricity usage data and total electricity cost.
Scheduling & Timer: Create schedules and set timers to automatically turn devices on and off at specific times.
Overload Protection: Set limits for power, current, and voltage to protect your devices.
LAN Control: Control devices within your local network even without internet access.
Share Control: Share control of the smart plug with family members through the eWeLink app.

Diagram illustrating various features of the SONOFF S31 Smart Plug including remote control, power monitoring, LAN control, mini size, voice control, timing schedule, and share control.

Figure 3: Overview of the smart features available with the SONOFF S31 Smart Plug.

4. Setup Guide

Follow these steps to set up your SONOFF S31 WiFi Smart Plug:

Download the eWeLink App: Search for "eWeLink" on the App Store (iOS) or Google Play Store (Android), or scan the QR code provided in the quick start guide included with your product. Install the app on your smartphone or tablet.
Register and Log In: Open the eWeLink app, register a new account if you don't have one, and then log in.
Plug In the Smart Plug: Insert the SONOFF S31 Smart Plug into any standard 120V wall outlet. Ensure the outlet is powered.
Enter Pairing Mode: Press and hold the button on the smart plug for approximately 5 seconds until the LED indicator starts blinking rapidly. This indicates it's in pairing mode.
Add Device in App: Open the eWeLink app, tap the "+" icon in the upper right corner, and follow the on-screen instructions to add your device. You will need to select your 2.4GHz Wi-Fi network and enter its password. Note: The SONOFF S31 only supports 2.4GHz Wi-Fi networks. Ensure your device is connected to a 2.4GHz network during setup.
Name Your Device: Once successfully paired, you can name your smart plug (e.g., "Living Room Lamp," "Coffee Maker") for easy identification and control.

Quick Start guide showing three steps: 1. Download eWeLink APP, 2. Power on, 3. Open eWeLink APP and click '+' to start pairing.

Figure 4: Visual guide for the quick setup process of the SONOFF S31 Smart Plug.

5. Operating Instructions

5.1. App Remote Control

After successful setup, you can control your smart plug from anywhere with an internet connection:

Open the eWeLink app.
Tap on the device name to toggle it on or off.
Access detailed settings, including power monitoring, schedules, and timers, by tapping on the device icon.

Hand holding a smartphone showing the eWeLink app interface for remote control of smart devices in a home setting.

Figure 5: Remote control of the smart plug via the eWeLink app.

5.2. Voice Control

The SONOFF S31 is compatible with Amazon Alexa and Google Home. To enable voice control:

Link your eWeLink account to your Amazon Alexa or Google Home app.
Discover devices within the Alexa or Google Home app.
Use voice commands such as:
- "Alexa, turn on [device name]."
- "Hey Google, turn off [device name]."

Woman using voice commands with Alexa to control a smart plug, with speech bubbles showing 'Alexa, turn on the light' and 'Okay'.

Figure 6: Hands-free voice control with Amazon Alexa and Google Home.

5.3. Power Consumption Monitoring

Monitor your energy usage directly from the eWeLink app:

In the eWeLink app, select your S31 Smart Plug.
Navigate to the "Consumption" or "Power Monitoring" section.
View real-time power (Watts), current (Amps), and voltage (Volts).
Access historical data for up to 100 days to track trends and total electricity cost.

Smartphone screen displaying power consumption data for a smart plug, with a graph of daily consumption and real-time monitoring options.

Figure 7: Detailed power consumption monitoring within the eWeLink app.

5.4. Overload Protection System

The S31 Smart Plug includes an overload protection system to safeguard your appliances and home:

Within the eWeLink app, go to the device settings for your S31 Smart Plug.
Locate the "Overload Protection System" (OPS) settings.
Set maximum thresholds for power, current, and voltage. If the connected appliance exceeds these set limits, the smart plug will automatically turn off to prevent damage or fire.

Comparison showing SONOFF S31's overload protection system settings on a smartphone screen next to a microwave, indicating it can limit values to ensure safe operation.

Figure 8: Configuring overload protection settings for the SONOFF S31 Smart Plug.

6. Maintenance

To ensure optimal performance and longevity of your SONOFF S31 Smart Plug:

Keep the device clean and dry. Use a soft, dry cloth for cleaning. Do not use liquid cleaners or sprays.
Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
Do not place heavy objects on the smart plug or connected cables.
Regularly check for firmware updates in the eWeLink app to ensure you have the latest features and security enhancements.

7. Troubleshooting

If you encounter issues with your SONOFF S31 Smart Plug, refer to the following common problems and solutions:

Problem	Possible Cause	Solution
Device cannot connect to Wi-Fi / Pairing fails.	Incorrect Wi-Fi password. Not connected to a 2.4GHz Wi-Fi network. Weak Wi-Fi signal. Router settings (e.g., too many devices, firewall).	Double-check your Wi-Fi password. Ensure your phone is connected to a 2.4GHz Wi-Fi network during pairing. Temporarily disable 5GHz on your router if necessary. Move the smart plug closer to your Wi-Fi router. Restart your router. Try resetting the smart plug and re-pairing.
Device is offline in the app.	No internet connection. Power outage. Wi-Fi signal loss.	Check your home internet connection. Ensure the smart plug is receiving power. Verify Wi-Fi signal strength. Unplug and re-plug the smart plug.
Voice control not working.	eWeLink account not linked to Alexa/Google Home. Device not discovered by voice assistant. Incorrect device name.	Ensure your eWeLink account is correctly linked in the Alexa/Google Home app. Ask Alexa/Google to "discover devices." Use the exact device name you set in the eWeLink app.

8. Specifications

Specification	Value
Model Number	S31
WiFi Requirement	2.4Ghz Only
Rated Voltage	120V
Rated Current	15A Max
Max Power	1800W
AC Frequency	2.4 Ghz (This seems to be a typo in source, likely meant Wi-Fi frequency)
Product Dimensions	3 x 1.57 x 1.3 inches
Item Weight	3.2 ounces
Material	Polycarbonate (PC)
Certifications	ETL, FCC, RoHS

Note: The maximum power may vary based on local voltage.

9. Warranty and Support

The SONOFF S31 WiFi Smart Plug comes with a 1 Year Warranty from the date of purchase.

For technical support, troubleshooting assistance, or warranty claims, please visit the official SONOFF website or contact their customer service. Keep your purchase receipt as proof of purchase for warranty purposes.

You can find more information and support resources at the SONOFF Store on Amazon.

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SONOFF S31