Playing with: DDS238-2 Zigbee Smart Meter

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A quick teardown followed by a brief look at the Tuya app interface for this Zigbee smart meter.
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[@SteveBrace]

So the 100W bulb came on immediately, then you went to find a torch to read the display... I think I can see another option @Julian Ilett 🤔

[@techman2471]

Thank you for pointing that out. After reading your comment, I hadn't laughed that hard in awhile!🤣

[@JulianIlett]

Well, in my defense, 100W bulbs do get very hot!

[@joeabad5908]

Another informative video.. Thank you for uploading

[@jonathanInLondonUK]

At 20:36 there's a "switch prepayment" option. I imagine you can put it in to prepayment mode, add credit, and the remaining power will be a countdown to zero, and then the relay will click. I think also that Imp usually refers to "impulses" with power meters.

[@medienmond]

The zigbee module is a tuya module and is normally really quick adapted in zigbe2mqtt for use in homeassistant. I have several lights and relays with tuya modules working in my homeassistant instance. Working flawless until today.

[@jlucasound]

What pinched that white neutral wire? Is that OK?

[@douro20]

Not all smart meters have remote disconnect. There are a few companies which make screwdrivers with built-in fixed torque limiters. Felo is probably the best known example.

[@JulianIlett]

The energy companies rarely use the remote disconnect - someone might be using a mains-powered CPAP machine.

[@bacemli]

Thank you for the detailed description. Could you kindly post the link to purchase it?

[@FMontanari709]

Probably the "available power" is meant for battery backup systems? So you enter the battery capacity and it measures how much juice is left and how much has it been charged? (That would also explain the reverse power thingy)

[@carloseduardocolpo5863]

A moving average can be made of the last 5 measurements divided by the sum of the elapsed time or something like that taking into account the total amount

[@aaronmdjones]

Hello again Julian. Nice video! You can however sort out your orientation problem by installing a DIN rail terminal block next to it so you can bring the inverter line conductor down to the bottom side of the device in its upright position. See e.g. ToolStation product codes 14371 or 14055 (as appropriate).

[@medienmond]

You really need to Set Up a homeassistant for your home. Just for statistics it's awesome. And it integrates all wifi and zigbee stuff into one thing that is under your own control.

[@aspendell209]

A 100w light bulb would generate 160 pulses/hr. 3600 secs/160 = 22.5 secs per pulse. Yours was slightly under 100w, so maybe every 24 secs on your setup.

[@JulianIlett]

Ta. I'll be needing a formula like this: Watts = Constant / pulse interval (in milliseconds).

[@aspendell209]

@@JulianIlett Watts = (.625 / interval secs) * 3600 secs . 1 watt = 1.6 pulses, take the inverse 1 / 1.6 = 0.625 or to simplify: watts = 2250 / interval secs

[@aspendell209]

@@JulianIlett Keep in mind while coding, that your pulse intervals will be very long if measuring low power. a 10w load would only update every 225 secs, and 37.5 mins for 1w.

[@JulianIlett]

Yeah, that's what I arrived at: Watts = 2,250,000 / interval-in-millis At night the pulse output will be inactive. I'd like to use an interrupt rather than polling, but I may have to have a separate loop to check if the light is flashing at all (something that times out).

[@dougle03]

Is the WiFi version based on an ESP chip? If so, a quick reflash of that would give you access to all the raw data, then either process on chip or send it off via mqtt to influxDB and Grafana for as many graphs, charts and derived metrics your heart could desire...

[@jlucasound]

Good Morning, Julian!

[@waleedelhadidy4879]

can i use to turn on, off AC current on schedules or to protect households from over, under AC voltage trips and is it working on any 2.4 GHz router WiFi or it needs special router to connect

[@webchimp]

Maybe that available power is if some models can monitor a power bank.

[@adon8672]

Thanks for the video. Since you are using the WiFi version on solar power, is it safe to assume they are rated for both AC and DC?

[@eDoc2020]

Its power supply requires an AC input. The solar one is monitoring the inverter's output.

[@LemonJuiceGV]

Would it be possible for it to display the graph for voltage over time and frequency over time? For solar UPS diagnostic

[@jlucasound]

I always tighten MY connections with Fig Newtons. So Tasty. :-0

[@JulianIlett]

I've never heard of fig newtons - never seen them :)

[@twotone3070]

Those yellow and white wires seem to have been 'crimped' by a sharp internal component on assembly, could be a very loud bang waiting to happen.

[@eliotmansfield]

Code for pulse counting: learn.openenergymonitor.org/electricity-monitoring/pulse-counting/interrupt-based-pulse-counter

[@johnbetter919]

Thank you for posting link

[@JulianIlett]

Handy. Thanks Eliot :)

[@ilanozana9652]

Q maybe the reactive power ,but it's a resistive liad,?

[@banananaa]

It's kVArh: kilo volt-ampere-reactive hour.

[@adon8672]

Can this work directly with WiFi or a Zigbee hub is compulsory.

[@JulianIlett]

The ZigBee version requires a ZigBee hub.

[@adon8672]

@@JulianIlett thanks for the prompt response.

[@MrCalldean]

No more shed activity of late Julian?

[@richardgrier4721]

Impulses (pulses) per hour?

[@alisoncarney1745]

Are you feeding solar into the mains ???? Safely i presume

[@JulianIlett]

All MCS approved.

[@twotone3070]

I suspect that is by far the most common domestic situation in the UK.

[@Hex-Mas]

Ebay is in the crapper. Banks are black listing it, At least in the states.

[@andymouse]

Yeah tax the church.

[@muh1h1]

Are you sure those are "impressions" and not "impulses"?

[@TKomoski]

😀

[@ndmusick11]

The app looks like the B-N link I have some smart plugs

[@jordanadam87]

I dont see any fuse inside for electronics. This could be dangerous.

[@alien8r33d]

Red LED flash at 12:36.

[@ionutoctav87]

IVAP or NoN IVAP. This is the difference between the extra functions, not the zigbee vs wifi.

[@davey2k12]

Whats it update every hour I bet it gets WiFi connection issues lol

[@jlucasound]

Red Flash @12:36.

[@richardballinger517]

I've been looking at these type of meters for about three months now after looking at solar to try and cut my electric bill. To go solar I obviously needed to know what I was using which got me on to British Gas's web site. According to them someone in my situation uses on average 1.8KWh a day. Well I'm very conscientious with my energy use. Apart from the fridgefreezer, broadband, NAS, TVR, laptop and lightbulb on that's it. So how the hell do they forcast I use 8.3KWh a day? So I purchased a well known brand MID compliant unit the same form factor here to put in series with my existing electric meter. It is an early smart meter fitted with N Power who became someone else then someone else then I changed over to that lot called look after my bills who put me with Neon Reef who have both since disapeared and been taken over by British Gas. Funny thing is, British Gas don't seem to have access to my smart meter which is good but I swear it is ripping me off? I have to give them meter readings inorder for them to bill me. Anyway. Got this quality British made brand from Farnell, £187. Wired it in. Had all loads switched off. Turned on my main ON/OFF switch and away it went. Pulse/LED output flashing away like mad clocking up KWh's at an alarming rate which was odd as there was nothing loading it yet it claimed I was drawing 470A through a 100A fuse? Long story short, it was useless, sent back to Farnell, refunded. Decided to buy another direct from the manufacturer, £109. Farnell is a rip off. Connected this up to a mains safe block with no load. Did exactly the same thing except this one claimed I was drawing 570A into some virtual energy vortex? Gave up on it and was trying to arrange collection and thought I'll have one last look at it and it worked but later failed again. Had been talking with an engineer at the factory sending him photo's and video's of how I was testing it. FYI I am an electronics engineer myself. He couldn't explain it and had sent me photo's of one he had there working fine except it was from an older batch. So they were going to collect but I said I still have the problem I'm trying to solve, can't you just test one OK and send me that. Anotherone turned up day or two before christmas and this one works fine. Actually got as far as doing the same here, connecting a 100W light bulb to it. I really would have loved a wifi one but they didn't do an MID compliant one. No and my luck it will prove the original meter correct? Good video.

[@berlinberlin4246]

Has any one tryed it with Homeassistent?

[@deslomeslager]

Good question, like to know this too.

[@andymouse]

Is a "graarve" anything like a "graph" ?....cheers.🤣🤣

[@twotone3070]

It's the Home Counties version, much more up-market.

[@t0nito]

That software must be because it's Zigbee, my Wifi unit is dated 2023-01-02 and it still uses that crappy software.

[@egeotomasyon]

1:15 Kvarh = Kilo Volt*Ampere Reactive Hour . Yes Reactive Energy Unit