SONOFF S31 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home, IFTTT Supporting, 2.4 Ghz WiFi Only (4-Pack)

works great, especially after flashing tasmota open source firmware.
Easy to flash with tasmota firmware. Can easily sense power usage and set on/off timers with new firmware. I like the button on the end so it’s easy to press while the plug comes out the front. great for a diy/maker person who likes to unlock the capability of these devices.

Own Over 25 Of Them, Tasmotized And Mostly Happy
Like many other reviewers, I have purchased this particular switch to install Tasmota on. I use them for energy monitoring, and in some cases their “original intent” – outlet switching, in my home. I buy whatever pack is cheapest per unit at the time, be it 1, 2 or 4 pack versions. They’re all the same in my experience.To get them installed with Tasmota, I first tried to solder leads to them. Then I tried to solder pin headers and that was a little bit easier. I’m slightly beyond entry level skill with soldering, but I destroyed at least three units in this learning process. I finally graduated to micro-grabber electrical test clips and have ripped through over two dozen conversions now without incident.Let’s be frank. I’d rather Sonoff just offered Tasmota OS from the get-go, or made these over-the-air flashable. I will settle for nothing less than local control and I’m definitely not itching for a “new and different cloud solution or app.” I’d prefer not to hack these devices in the first place and if Sonoff works towards preventing this from a hardware or software standpoint, I will buy no more of them. At the time of this writing (March 2022), this is probably one of the cheapest way to get local energy monitoring and basic 15 amp capable on/off outlet switching.I use Home Assistant for my home automation platform. These are fully compatible with their new “energy monitoring” dashboard. This provides me with significant insight into my home’s energy use, especially now that they’re widely distributed to the overwhelming majority of my outlets. I usually capture between 13-18 kilowatt hours per day, the bulk of my usage. To be clear, I use “higher grade” energy monitoring switches in “mission critical” applications (furnace, fridge, etc.), but these are great even for non-mission critical high amp usage scenarios up to 15 amps. I’ve pushed some of mine well up to the limits and haven’t had any major problems or sparks fly.Out of a couple dozen, I’ve had one actual device failure. Oddly enough, even with different firmware, different units operate differently on my WiFi. Some stay connected to Wifi 100% of the time, others intermittently connect throughout the day. I don’t lose any granular Home Assistant data because of this, nor are they ever inaccessible and fail to turn on/off. I don’t have a good answer as to why different units behave differently with the same software. Odd behavior, but it doesn’t result in problems. I really can’t complain anyway, I’m using them well outside of the manufacturer’s intended use.Build quality is “good enough” but I wish there was a bit more consistency. Since the majority of buyers are intending to hack these, I really wish they wouldn’t cinch down some of the poor-quality screws like they are Shee-Ra or the Hulk. I’ve destroyed way more screws than I’ve wanted, and that’s with the “perfect screw removal tool” which I’ve determined to be a 2.0mm flathead screwdriver. Again, I just wish I could buy a decent quality, super cheap, 15 amp capable smart switch product with the OS of my choice out of the gate.I’ve used these to solve VERY REAL problems in my home. From triggering outlets based on other inputs to making serious dents in energy conservation, I believe the $200ish dollars I’ve put into these Sonoff S31 units will eventually pay for themselves. It’s fairly easy for me when I’m paying almost $0.25 per kilowatt hour, others might not have as good of an ROI. If anything, I’ve achieved “some level” of energy usage consciousness. I’ve killed and/or automated quite a few parasitic energy draws I wasn’t even aware of, and have easily increased my automation abilities at the same time.It’s important to know that these utilize about 2 watts each, just to function. This might not seem like much, but with two+ dozen of them running 24 hours a day – we’re talking about a ~50 watt constant load just to monitor outlet energy. For me, I’ve killed and automated much more than that, so I’m “in the black” as it were. It’s important, at least for me, to keep tabs on the cost and value of energy monitoring. I’m hoping I can continue to use these to save at least $500 in energy in the next 5 years, and so far, that seems to be a reasonable goal based on how I use them.Lastly, I don’t want to get too much into minutia, but you need a fairly robust WiFi network to support the “internet of things” over WiFi. Personally, I utilize multiple networks, including Lutron, Z-Wave, Zigbee and WiFi to get there. Put simply, I don’t use these “cheap and ubiquitous” hacked WiFi devices to service mission critical applications in any way. If a failure would cost me a fair bit of money, I spend more than $10 to capture energy usage and (sometimes) provide switching capabilities.+4 stars for being a hackable and very useful device overall. You can debate about that last star, even I waver between 4 and 5 stars. They provide much value for not much dollar and a reasonable +/-2 year path to return on investment for many people that are trying to optimize energy consumption or provide local, automated switching controls.

Excellent intelligent electricity connector on wifi

I didn’t even test them with the app, I directly flashed them with Esphome. Disassembly was a breeze, flashing them was a bit tricky but that’s what you get when you do it without an iron solder.Now that they’re flashed, I run a custom template to report the current and wattage to Home assistant. The build quality is solid and they have so far responded really well.This is really the best of both world, a great product flashed with a custom firmware I have 100% control over.

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