2.4 GHz Wi-Fi
Joins the site's own network; no gateway needed.

Smart WiFi DTU-M Wi-Fi datalogger that reports your inverter to Felicity's portal.
The Felicity Solar IOTH2406 is the Smart WiFi DTU-M — the module that puts a Felicity inverter online. It joins a 2.4 GHz network, reports to shine.felicitysolar.com and to the Felicity app, and shows three LEDs: PWR for power, COM for the link to the inverter and NET for the link to the server.
| RJ45 Port | PIN4 RS485-B, PIN5 RS485-A, PIN6 12V DC input, PIN7 GND |
|---|---|
| WiFi Network | 2.4G WiFi |
| Power Input | 12V DC (PIN6) |
| Monitoring Portal | shine.felicitysolar.com |



Felicity battery not charging? Below 0°C the BMS blocks the charge, a charge voltage under 57.6 V never fills the pack, and codes C01–C08 explain the rest.
Read: Felicity Battery Not Charging? Codes, Causes & Fixes →A long outage drained the battery, the grid came back shaky, and now there is a code on the screen. What 04, C02, 27 and the grid-return alarms really mean.
Read: Felicity Inverter Error After a Power Cut? What It Means →Inverter cutting out on hot afternoons? Error 18, T-REX 35/F35, E-CHO E12/E13, MPPT 87 and battery C09 — the official Felicity heat codes and their fixes.
Read: Felicity Inverter Overheating? Error 18 & Heat Codes →The port. On the DTU-M (IOTH2406) the RJ45 carries RS485-A and RS485-B; on the DTU-S (IOTH2407) it carries RS232-RX. Match the module to the port your inverter provides.
Connect it, then find its wireless network — the SSID starts with 'S' followed by the last ten characters of its serial number — join with the default password 12345678, and choose the site's network in the Felicity app.
To shine.felicitysolar.com, which is also reachable from a browser, and to the Felicity mobile app.