Wi-Fi network
Signal strength for Wi-Fi networks
- GOOD: Signal reading of -55 dBm or greater
- ACCEPTABLE: Signal reading between -56 dBm and -67 dBm
- POOR: Signal reading less than -67 dBm
Testing on mobile applications
- The signal strength of a particular location can be obtained using many mobile applications. The one we recommend using for Android OS is Network Cell Info Lite.
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Open the Network Cell Info Lite app and make a note of the dBm reading. Also, note the Wi-Fi name and frequency (2.4 GHz or 5 GHz). Most chargers are capable of functioning on 2.4GHz frequency.
Oftentimes, firewall settings may also have to be updated to facilitate the EV chargers to connect to the Wi-Fi network. Depending on the type of site, the site host may have to reach out to the internet provider to change the firewall settings to allow Wi-fi access to the chargers, or The site host may have to consult the property’s IT team to make changes to the firewall settings.
Mitigations for Poor WiFI Connectivity
For EV charger locations that fall under the POOR category, multiple access points will be required to provide network coverage at EV charger locations. The type of access point to be installed and its positioning in the parking lot or garage will vary for each site and should be finalized in consultation with a network engineer.
Recommendation for sites with low connectivity
There may be locations where public Wi-Fi is unavailable and cellular connectivity is poor. Such situations are typically encountered in parking garages or underground parking areas. In such cases, a new Wi-Fi connection needs to be established utilizing the building's telecommunication infrastructure.
- Determine the optimal pathway between the telecommunication room and the intended placement of the Wi-Fi modem.
- Install a new ethernet cable and connect it to the Wi-Fi modem.
- Configure the modem to establish a wireless local area network (WLAN) within the garage to facilitate connectivity for the charging stations.
It is imperative to maintain separate Wi-Fi networks for electric vehicle (EV) charging purposes and general public use. The Wi-Fi network designated for EV chargers should be secured to prevent any potential security breaches.