smartmeter

4G Smart Meter Communications Hub

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A photo of our electric meter with a new 4G communications hub on top.

If you’ve been reading this blog for some time now, you’ll be aware that, in March last year, our smart electric meter stopped being smart. It’s now fixed, and we have a new 4G communications hub too.

For some reason, that even now we’re not entirely sure of, no regular readings were being set back to our energy supplier. This meant that we had to take manual readings, which was a pain – our meter is in a cubby hole under the stairs in our cellar, behind our tumble dryer. We get our energy from Octopus (referral link), and although they tried various things at their end, after a few weeks, it was determined that we needed an engineer visit.

Unfortunately, this has coincided with the shutdown of the Radio Teleswitch service, which controls older Economy 7 meters. This means that, nationally, there’s huge demand for engineer visits to replace these older meters with newer smart meters. Whilst the shutdown should have happened last year, it’s been delayed and will (probably) happen this year. As such, it took until January for us to finally get an engineer visit.

The Communications Hub

It turns out that the electricity meter itself was fine. The issue was in the Communications Hub; if you have smart meters, then you’ll typically have:

  • An electricity meter
  • A gas meter (if you have mains gas)
  • A communications hub, which sits on top of the electricity meter and manages the home connection and the link with your energy supplier
  • An In-Home Display (IHD) which displays your usage
  • Some Octopus customers also have an Octopus Home Mini which sends your usage data over your Wi-Fi connection in real-time.

All these talk to each other using a private Zigbee mesh network. The Communications Hub then sends data to your energy supplier using one of three methods:

  1. If you live roughly south of the M62, then it’s sent over O2’s 2G or 3G data network.
  2. If you live roughly north of the M62, then it’s sent over a lower frequency 400 MHz radio data network operated by Arqiva.
  3. Or, if you have a newer communications hub, it’ll use Vodafone’s 4G network, and these are installed nationally.

4G migration

We originally had the second type, but now we have the third type which uses 4G. And it’s been working fine since the engineer installed it back in January, which is a relief. We’ve also noticed that it has a better connection with our IHD; before, it would periodically lose connection and wouldn’t show live data.

Plus, the new 4G communications hub is more future proof. If you have an older smart meter communications hub that uses 2G or 3G, then at some point in the future, your energy supplier will need to replace it. Of the four big networks, O2 is the only one still offering 3G at the time of writing. In fact, it may have already been switched off by the time you read this.

The slower 2G networks will be around a little longer, but the plan is that they too will be switched off in 2033. So, if you live in central and southern England, or in Wales, and have a smart meter, then sometime in the next 7 years, an engineer will need to come over and replace your Communications Hub. It should only take about an hour, and, at least in our case, there was no interruption to our electricity supply whilst the work was being done. There are no plans to shut down the 4G networks any time soon; according to this web site, Vodafone’s 4G contract runs until 2038.

If you live in the North of England or Scotland, then your current communications hub should carry on working. However, if you are having connection problems, then a 4G communications hub may work better.

Meanwhile, I’m just relieved that we don’t have to do any more manual readings.

How to: read a not-so-smart export meter

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A photo of our electricity meter showing our export reading

Somewhat annoyingly, our smart electric meter stopped being smart on the 26th March. I’m not entirely sure what happened, but since then, we’ve not had any automatic electricity readings sent to our energy supplier.

After a week, I reported the issue to Octopus, who are our energy supplier. We exchanged some emails back and forth, and tried various things, but apparently to no avail. What was weirder was that the gas meter still submits regular readings.

This web site has loads of information about smart meters, including how they work and how they communicate with your energy supplier. As well as the gas and electric meters, all homes with a smart meter have a ‘communications hub’ that sits on top of the electric meter, and it’s this that sends the data. So even though it was sat on top of our electric meter, it was only sending data from the gas meter. Weirder still is our ‘in home display’ (IHD) – the small black screen that sits away from our meters in our dining room. That was still accurately displaying data from both gas and electric meters.

With Octopus unable to fix the problem remotely, we’ll need an engineer to come out. And right now, there’s a long wait for smart meter engineer visits, as energy companies are currently prioritising those with a ‘radio teleswitch’ (RTS) meter. These older meters were used for (for example) Economy 7 tariffs, and listen for a radio signal to switch to a cheaper tariff – they’ve been around since the 1980s. Alas, the radio signal is being switched off at the end of next month, and there’s an estimated 400,000 RTS meters still in use. That doesn’t leave very long to have these replaced with smart meters.

Going back to manual readings

So whilst our gas readings are being sent automatically on a regular basis, we’re back to doing manual readings for electricity. As we have solar panels, we have to do two separate readings – an import reading, for the energy we use from the grid, and an export reading, for the energy that we sell back to the grid.

For the import readings, we can just use the IHD – press a few buttons, and it’ll give us our usage. But the IHD doesn’t display export readings. For that, we have to take a reading from the screen on the meter itself.

Our electricity meter is in our cellar, under the steps down from the kitchen. After we had our kitchen renovated, we also improved the access to the cellar, but it’s still in an awkward place. I have to move our tumble dryer out of the way, and crouch in the small space under the steps to take the reading.

It’s also not the most straightforward process. The meter itself has a small screen and two buttons, and you need to know which combination of button presses are required. Thankfully, Octopus offers this excellent guide to how to read various types of meters, and so I was able to submit both import and export readings. The next day, we were credited £116 for all the electricity we’d exported since the 26th March.

Hopefully, it won’t be too long before an engineer visits and fixes the issue for us. In the meantime, I’m also waiting to see if we can get an Octopus Home Mini, which bridges across to your home Wi-Fi network and sends data in near real-time.