> For the complete documentation index, see [llms.txt](https://docs.bituo-technik.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bituo-technik.com/troubleshooting/electrical/wi-fi-product-frequently-goes-offline.md).

# Wi-Fi product frequently goes offline?

Wi-Fi connectivity issues are typically caused by physical barriers, network settings, or electrical power factors. If your device frequently drops offline, please check the following common scenarios:

**1. Weak Signal or Metal Enclosure Interference**

* **Cause:** If the sensor is installed inside a fully metal distribution board, or separated from the router by thick concrete walls, the Wi-Fi signal will be significantly weakened (acting as a Faraday cage).
* **Solution:** Plug a Wi-Fi repeater/extender into an outlet as close to the distribution board as possible. Alternatively, consider using a distribution board with a plastic front cover/door, which allows Wi-Fi signals to pass through while keeping the metal back box compliant with local regulations.

**2. "Band Steering" & 2.4GHz Compatibility**

* **Cause:** Modern routers often use "Band Steering" (combining 2.4GHz and 5GHz under one Wi-Fi name). To optimize overall network speed, the router's logic will actively disconnect devices from the 2.4GHz band to force them onto the faster 5GHz band. Since the smart meter only has a 2.4GHz chip, it cannot connect to 5GHz and simply drops offline.
* **Solution:** Log into your router settings and separate the 2.4GHz and 5GHz networks into two different names (SSIDs), or create a dedicated 2.4GHz "Guest Network" specifically for your smart home devices.

**3. Router Device Limit (Overcrowded Network)**

* **Cause:** Standard home routers have a limit on how many devices can connect simultaneously. When overloaded, the router may temporarily kick devices offline to free up bandwidth.
* **Solution:** Disconnect a few inactive Wi-Fi devices to see if stability improves, or consider upgrading your router/adding a dedicated Access Point.

**4. Incorrect Voltage System (Mismatched Grid)**

* **Cause:** Installing the device on an incompatible power grid. For example, using an IEC 220-240V rated product on a 120V system (such as a single leg of a North American Split-Phase system). The 120V supply is far below the required operating voltage, causing the Wi-Fi module to fail or constantly reboot.
* **Solution:** Verify your local grid type before installation. Ensure the device is connected to the correct voltage (e.g., connecting across L1 and L2 for 240V in a split-phase system, or using a specific 120V version of the product).

**5. Grid Voltage Fluctuations**

* **Cause:** The device may reboot or drop offline if the local grid voltage fluctuates beyond its standard operating range (85% to 110% of the rated voltage).
* **Solution:** Ensure your local grid voltage is stable. For example, the IEC version of the SPM01 Wi-Fi is rated for 220V–240V. It requires a stable voltage between 187V and 264V (220V × 0.85 to 240V × 1.1). Extreme voltage drops or surges will cause the device to power cycle and lose connection.

**💡 Pro Tip: Assign a Static IP** To prevent IP conflicts (which can also cause offline issues when your router reassigns IP addresses after a power outage), we highly recommend logging into your router and assigning a **Static IP (DHCP Reservation)** to the sensor.