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Shelly energy monitoring

Shelly Energy Meters

Every Shelly energy meter we stock, from a module that measures one appliance to a DIN-rail unit that meters all three phases. What changes between them is where the measurement is taken.

The four meters

EM Mini Gen4 for one circuit inline. EM Gen3 for two clamped circuits from a wall box. Pro EM-50 for two channels on the DIN rail. Pro 3EM-3CT63 for all three phases. Every Shelly energy meter we stock is one of those four.

Read the model name

EM is the energy meter line. A 3 in front of it means three phase. Pro means the switchboard DIN rail, Mini means the small wall-box housing, and a number on the end is the current the clamp is rated to.

The PM relays measure too

Any Shelly with PM in its name measures the one circuit it switches, so a 2PM Gen4 behind a switch reports what those lights draw. The EM range is the other way round: it measures circuits it has no part in switching.

Australian stock, Melbourne support

We ship every Shelly energy monitor Australia wide, and everything here is wired for Australian mains at 230 V. Three-phase supply is common enough in Australian homes that it is worth checking your switchboard first.

Shelly · 8 products Shelly Energy Meters Australian stock
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Shelly EM Gen3 Energy Meter
Shelly

EM Gen3 Energy Meter

  • Single-phase
  • 80 A
  • CT clamps included
$99.95

Shelly that also meters · 10 products

A switch first, an energy meter second.

These turn a circuit on and off, and that is their main job. They also measure what the circuit draws while they do it, so each one doubles as an energy meter for whatever it switches. They are sold as relays, dimmers and plugs rather than meters, which is why they sit outside the list above.

Energy picker

Which Shelly energy monitor do I need?

Answer a few questions about what you want to measure and, for the whole home, your switchboard. We'll recommend which of the 8 Shelly energy monitors we stock suits the job, and explain why.

Or read the guide first
Question 1 of 1

What do you want to measure?
Buying guide · Shelly energy meters

What is a Shelly energy monitor?

It measures the power a circuit is using, and puts that number somewhere you can see it and act on it.

A Shelly energy monitor measures the power a circuit is using. It shows you how much that circuit is using right now, and keeps a running total of how much it has used over time. It does not turn anything on or off: every switch and appliance on the circuit works exactly as it did before the meter went in.

Where you see those numbers is your choice. The Shelly app shows the power usage as it changes, along with the history the meter has stored. Home Assistant finds the meter on your own network through its Shelly integration, with no Shelly account in the middle. Every meter also speaks MQTT and a local HTTP API, so any other dashboard that reads those can have the same data.

Then you can act on it. An automation can run when a circuit climbs past a figure you set, or when it drops to nothing because whatever was running has finished. A schedule can move a heavy load into a cheaper tariff window. The meter supplies the reading, and a relay or a contactor does the switching.

How to read a model name

Pro Where it goes

Pro is the DIN-rail line that sits in your switchboard, and it takes an Ethernet cable as well as Wi-Fi. Mini is the small wall-box housing, for a box the standard size will not fit. A name with neither word in it is that standard size.

Options Pro DIN rail, Ethernet Mini 29 x 34 mm – 37 x 42 mm
Pro, Mini, or nothing
3 Phases

A 3 in front of EM marks a Shelly three phase energy meter, which reads all three phases of a three phase supply at once. Without the 3 you have a Shelly single phase energy meter, which is what most Australian homes are wired for. Only the number in front of EM counts phases. The number after Gen is the generation, so a Gen3 meter is not a three phase one.

Options 3 three phase – single phase
3, or nothing
EM Measures or controls

EM means the device only measures. It is not wired to turn anything on or off, which is how one meter can cover a whole house at once. PM is a relay, so it turns the power to one circuit on and off and measures that same circuit while it does.

Options EM measures only PM measures and turns power on and off
EM or PM
Gen4 Generation

Each generation adds protocols and a faster processor rather than changing how the device wires in, so Gen4 is the one to pick for anything new. A name with no generation in it is a Pro, which runs Gen2 hardware.

Options Gen4 Zigbee, Matter, Wi-Fi Gen3 Wi-Fi, Bluetooth – Pro, Gen2 hardware
Gen4, Gen3. Pro has none

Read it as one sentence: Shelly EM Mini Gen4 is the small wall-box meter, single phase, measuring only, on the current generation. A number on the end of a Pro name is what its clamp is rated to: 50 amps on the Pro EM-50, 120 and 400 on the two larger Pro 3EMs, and 63 on the 3CT63, which is the one that comes with its transformer in the box.

What are you trying to measure?

Most people arrive knowing the job and not the range. Start from the job and the model picks itself.

Hot water or air conditioning

The two biggest loads in most Australian homes, and both are usually their own circuit at the board. The clamp closes around the wiring you already have, so no cables need changing.

We recommend Shelly EM Gen3 Up to two clamps, single phase

Solar, import and export

One channel on the mains and one on the incoming solar production gives you what you imported and what your roof made, as two separate numbers. A single channel nets them together and hides both.

We recommend Shelly Pro EM 50 Two channels, 50 A clamps

The whole house, single phase

Clamp the mains where they land in the switchboard and you see what the whole house is using. Check the main switch first: most Australian homes are 63 A or 80 A, which is more than the Pro EM-50 can read.

We recommend Shelly EM Gen3 Up to 80 A, CT 50A included

Frequently asked questions

We fit and test this gear ourselves. Can't find yours? Ask our Melbourne team

For most of them, yes. The clamps go around live cables in the switchboard and the inline models wire into a circuit, and in Australia that's a job for a licensed electrician. It's usually quick, though: a whole-house meter is normally a single visit, and your existing wiring stays as it is.

It doesn't need to talk to the inverter at all. The clamp reads the current in the cable, so the meter works the same whoever made the panels or the inverter. Put one clamp on the mains and one on the solar circuit and you get import and generation separately, without touching the solar system.

The EM Mini Gen4 and EM Gen3 store at least ten days of one-minute records in the device itself. The Pro EM-50, Pro 3EM-3CT63 and Pro 3EM-400 hold up to sixty days at the same resolution, and the Pro 3EM-120 holds at least forty-five. Anything longer than that means sending the data somewhere, either to the Shelly cloud or to your own system over MQTT.

Yes. The measurement and the on-device log are local, so a meter keeps recording through an outage and the app catches up when the connection returns. What stops is remote access and anything you have pointed at a cloud service. This is the same local-first behaviour as the rest of the Shelly range.

Phases, and where the device goes. The EM Gen3 is a wall-box meter that reads one single-phase supply across up to two clamps, so it suits one board or one pair of circuits. The Pro 3EM-3CT63 is a DIN-rail meter that reads all three phases of a three-phase supply at once, and it will also run on a single-phase board. If your switchboard has three actives coming in, the 3EM is the only one of the two that will tell you the truth.

It measures, but it is a relay, not a meter. The PM Mini Gen3 switches a circuit and reports what that circuit draws, so the measurement is tied to the load it controls. Its replacement is the EM Mini Gen4, which measures inline without switching anything. If you want the switching as well, the PM relays are on our Shelly relays page.

All of them. Every Gen2 and later device speaks MQTT and a local HTTP API, and Home Assistant's Shelly integration picks them up on the local network without the Shelly cloud in the middle. The Pro models add Modbus on top, which is what an existing building system usually wants.

With the Pro 3EM-3CT63, yes, and it is not what most people picture: the 3CT63 is a single combined three-phase transformer that sits on the phase wires over the circuit breaker, rather than three separate clamps. Its aperture is 9 mm a conductor, which is the tightest of the range, so the mains are worth measuring before you order. The Pro 3EM-120 and Pro 3EM-400 take three split-core clamps each, ordered separately, at 15 mm and 35 mm. On all three a fourth clamp for the neutral is optional and not included. The EM Gen3 comes with one CT 50A clamp in the box and takes a CT 80A as a separate order, while the Pro EM-50 takes its two clamps separately. The EM Mini Gen4 uses no clamp at all, because it wires into the circuit and measures the power passing through it.

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