SONOFF S31 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home Assistant, IFTTT Supporting, 2.4 Ghz WiFi Only (2-Pack)

My intended goal for purchasing a dozen of these ugs was to integrate them with Home Assistant. I was able to successfully integrate them without too much fuss. The plugs work as designed and advertised. Additionally, I am able to either use the eWeLink app to see the each plugs overall power usage and control each plug. I plan on flashing these with ESPHome firmware so I reduce the need to rely on the Sonoff cloud. These plugs do have a LAN Mode option which enables them to reduce the need for the cloud, which I really liked. Overall, plugs are a 9/10 on my rating.

I bought a single S31 to replace an unreliable Fibaro Z-Wave switch. I never even bothered to use the original S31 firmware. I took it out of the box and flashed it with ESPHome under Home Assistant. Worked great the first time with no surprises. The power monitoring seems to work, but I havent bothered calibrating it. If it continues to be reliable over time, I will definitely buy more of these.

Wouldn’t connect in normal mode. Only compatible mode. Worked but kinda screwy on updating. Other ones I’ve seen update quick every couple seconds. Now it’s stuck showing the same wattage all day even with no devices plugged in. Guess I’ll update on the replacement if it works or not.

I love these switches because they are cheap but durable and (assuming you are not afraid of soldering) it isnt so difficult to replace the Sonoff software with something open source like Tasmota. They are my goto power-measuring device on my home automation system (Home Assistant) for household appliances. But here is my warning if you do intend to reprogram them: to open up the case, you need to extract three screws and these are always in so tight that it is extremely easy to strip them, or damage the case, or both.

most apps have an option for either 2.5ghz or 5ghz. this will only work on 2.5. this should have been in the bio. will post another update after usage of a month, most notably if it crashes after brown outs.

I bought this as an inexpensive way to meter how much amperage my computer desk pulled at peak load, as well as other things like AC units, coffee machines, etc. it faithfully shows amps and watts of the load. The problem is it’s a “smart” switch which you can toggle on or off, or set automated “scenes”. In addition it has “inching” auto triggers. Even with nothing defined for the automated toggles the logs still show “device triggered” or “scene triggered” at seeming random intervals, which is really inconvenient if you’re using it at the time. Latest firmware did not fix this behavior. I’d recommend only using for short duration active metering and then removing from your path.

The S40 brings a new elegant and a little design to the previous one. It is amazing what you can do with the power consumption capabilities. And the best of all is the automatic turn off when there is an overload to protect the connected device. All of its smart options are as expected, they are even better when you have other Sonoff products. For example, I can turn on my wall plug when I turn on my light switch and more, just with the app. Overall, it is an incredible product and a must have in your smart house.

Q: Why would my firewall block a well known Ch___ government monitoring site? I guess Im a suspicious person by nature, but while setting up my Sonoff Type B wifi Smart Plug (S40TPB) I got enough red flags to make me return it. A), the instructions ask me to turn on my phones location settings and share my phones location with the Smart Plug. OK, yellow flag, but I suppose that makes sense - sorta. B) Be sure that the MAC address of the device is not on the BLACKLIST of your MAC management [I presume they mean my network firewall. Blacklisted equals a huge RED FLAG for me. C) Please contact your ISP [Internet Service Provider] and confirm our server address is not shielded [I presume they mean blocked]. cn-disp.coolkit.cc and other coolkit.cc hostnames are basically in C___a, right? Quick question for anyone reading this far; why does a blacklisted server in C___a needs to know when I turn your lights on and off? After a few minutes of digging around to see where my turn the light on requests were being routed to, I quickly unplugged this little monster and promptly brought them to my nearest UPS store for a full refund.

I bought these to use with Tasmota and it works great! Easy to disassemble with a screwdriver and a spudger, easy to solder points that are clearly labeled for programming, and doesnt look scratched up from disassembly at all. The Tasmota software is even able to see the power factor, watts, apparent power, volts, and amps! I didnt try the app that came with it, it probably sucks as most smart outlet apps do.

Plug & Play , easy to connect to ALEXA and to Smart Home, keeps the consumption data, great product