Best Energy Monitor Singapore (2026): 3 Picks a Licensed Electrician Would Actually Install
Disclosure: As an Amazon Associate, MM Engineering Works earns from qualifying purchases. This doesn't change our picks — we only list meters we'd be comfortable fitting into a Singapore DB box.
Your SP bill tells you how much you used. It never tells you what used it. A home energy monitor does — live, appliance by appliance, phase by phase. And before you spend S$15,000+ on a 3-phase upgrade or a new DB box, it can tell you whether you actually need one.
Quick answer: The best energy monitor Singapore homes can buy in 2026 is the Shelly 3EM — it fits our 230/400V 50Hz supply, mounts on the DIN rail in your DB box, and tracks up to three circuits or all three phases in one app.
- Best overall: Shelly 3EM — proven, most-reviewed, has a relay for load control
- Best value / single-phase homes: Shelly 3EM-63W Gen3 — compact, watches 3 circuits at once
- Best for landed 3-phase, solar & EV: Shelly Pro 3EM 120A — LAN + Wi-Fi, bidirectional, 120A clamps
Shelly 3EM
Three clamp sensors, Wi-Fi, DIN rail. Works on single-phase or 3-phase.
Check price on Amazon.sgShelly 3EM-63W Gen3
Newest generation. Up to 63A per channel — ideal for HDB, condo & single-phase landed.
Check price on Amazon.sgShelly Pro 3EM 120A
For 3-phase landed homes, solar PV and EV owners. LAN, Wi-Fi, Bluetooth, Matter.
Check price on Amazon.sgKey takeaways
- Singapore runs on 230V single-phase / 400V 3-phase at 50Hz — buy a meter built for that, not a US 120/240V split-phase monitor.
- The SP app shows whole-home usage in 30-minute blocks; an energy monitor shows each circuit or phase second by second.
- All three picks are DIN-rail meters that sit inside your DB box, so they must be installed by an EMA-licensed electrician.
- One to two weeks of monitor data can show whether you really need a S$15,000–S$28,000 3-phase upgrade — or just a circuit rebalance.
- No hub and no subscription needed — all three work with the free Shelly app and Home Assistant.
Why your SP bill (and the SP app) isn't enough
Most Singapore homes now have an SP advanced meter, and the SP app shows your usage in half-hour blocks. That's useful for spotting a bad month. It's useless for answering the questions homeowners actually ask us:
- "Which appliance is eating my bill — the aircon, the water heater, or something left on?"
- "Why does my breaker trip when the aircon and oven run together?"
- "Can my supply handle an EV charger, or do I need a 3-phase upgrade?"
- "Are my three phases balanced, or is one overloaded?"
The SP meter sees your whole home, one number, 30 minutes late. An energy monitor sees each circuit or each phase, second by second, on your phone. That's the difference between guessing and knowing.
The S$20,000 question we get on site visits
A pattern we see again and again: a landed homeowner calls because the main breaker keeps tripping. Another contractor has already told them they need a full 3-phase upgrade — a S$15,000–S$28,000 job with SP Group applications and weeks of waiting.
Sometimes that's right. But often, when we measure the load properly, the real story is different: one overloaded circuit, an ageing water heater, or two big appliances that always start at the same time. The fix is a circuit rebalance or a DB box replacement — a fraction of the cost.
The lesson: the homeowners who save the most money are the ones who measure before they spend. A few hundred dollars of data beats a five-figure guess.
That's why we now tell clients: if you're facing a big electrical decision — 3-phase upgrade, DB box replacement, an EV charger or solar — put an energy monitor in first. Two weeks of real data makes every quote you get easier to judge.
How we chose the best energy monitor Singapore homes need
We didn't rank these on star ratings. Each pick had to pass the same checks we'd apply before fitting anything into a client's distribution board:
- Built for Singapore's supply — rated for 230/400V, 50Hz, single-phase and 3-phase.
- DIN-rail mounting — it must sit neatly and securely in a standard DB box.
- Per-circuit or per-phase data — not just one whole-home number.
- Local control, no subscription — works on Wi-Fi with a free app, plus Home Assistant for power users.
- Available on Amazon.sg with delivery to Singapore.
Shelly's 3EM family was the only range that passed every check across HDB, condo and landed homes, which is why all three picks for the best energy monitor Singapore list come from it.
Best energy monitor Singapore comparison table (2026)
| Feature | Shelly 3EM | Shelly 3EM-63W Gen3 | Shelly Pro 3EM 120A |
|---|---|---|---|
| Best for | Most homes | HDB, condo, single-phase landed | 3-phase landed, solar, EV |
| Phases | 1 or 3 | 1 or 3 | 1 or 3 |
| Sensor type | Clamp-on CTs | Pass-through, up to 63A/channel | Clamp-on CTs, 120A |
| Connection | Wi-Fi | Wi-Fi + Bluetooth | Wi-Fi + LAN + Bluetooth |
| Load control | Yes — contactor relay | No | No (automations via app) |
| Solar export tracking | Yes | Yes | Yes — bidirectional |
| Smart home | Alexa, Google, Home Assistant | Shelly app, Home Assistant | Matter, Alexa, Google, Home Assistant |
| Mounting | DIN rail (in DB) | DIN rail (in DB) | DIN rail (in DB) |
All three are built for 230/400V 50Hz European-style supplies — the same as Singapore. Check the live price and delivery date on Amazon.sg before ordering; these models ship from Amazon's international store.
The 3 best energy monitors for Singapore homes, reviewed
#1 · Best overall
Shelly 3EM — the best energy monitor Singapore homes can start with
The Shelly 3EM has the longest track record of any DIN-rail energy meter on Amazon.sg, and it's the one we'd recommend if you only read one section of this guide. Three clamp sensors let you watch either all three phases of a 3-phase supply, or three separate circuits on a single-phase home — say, the aircon, the water heater and the kitchen.
Its secret weapon is the built-in relay. With a contactor, it can automatically cut a non-essential load (like a water heater) when total demand gets close to your breaker's limit. For homes that trip because two big appliances clash, that alone can delay or avoid an upgrade.
- Proven, huge user base
- Relay for load-shedding
- Works with Home Assistant, Alexa, Google
- Older generation (no Matter)
- Wi-Fi only — weak signal in metal DB boxes
Fits inside your DB box — must be installed by an EMA-licensed electrician.
#2 · Best value
Shelly 3EM-63W Gen3 — compact and modern
The Gen3 model is Shelly's newest slim meter. Instead of clamps, your circuit cables pass through the meter, which measures up to 63A per channel. That's plenty for a typical HDB flat, condo, or single-phase landed home — and it means you can monitor three individual circuits with very tidy wiring.
It's the smart buy if you're still on single-phase and planning ahead: it works now, and it can monitor all three phases after a 3-phase upgrade. For HDB and condo owners, it's the best energy monitor Singapore electricians can fit without crowding the DB box.
- Newest hardware, real-time clock
- Monitors 3 circuits independently
- Small footprint in crowded DBs
- 63A per channel max
- No relay for load control
Pass-through installation — this one definitely needs an electrician.
#3 · Premium pick
Shelly Pro 3EM 120A — for 3-phase landed, solar and EV homes
If you own a 3-phase terrace, semi-D or bungalow — or you have solar panels or an EV — this is the professional-grade option. The LAN port is the big upgrade: DB boxes are often metal and in the far corner of the house, where Wi-Fi drops out. A wired connection keeps your data flowing.
It measures in both directions, so you see exactly how much solar you export versus import, and the 120A clamps cover large landed supplies. It also supports Matter, so it slots into newer smart-home systems cleanly. For 3-phase landed homes, this is the best energy monitor Singapore owners can buy without going to commercial-grade gear.
- LAN + Wi-Fi + Bluetooth
- Bidirectional (solar ready)
- 120A clamps for big supplies
- Highest price of the three
- Overkill for most HDB flats
Pairs well with a 3-phase power upgrade — ask us to fit it on the same visit.
Which best energy monitor Singapore option fits your home?
Tap your situation:
- HDB / condo: Shelly 3EM-63W Gen3 — monitor aircon, water heater and kitchen as three separate circuits.
- Landed, single-phase: Shelly 3EM-63W Gen3, or the Shelly 3EM if you want a relay for load-shedding.
- Landed, 3-phase: Shelly Pro 3EM 120A — 120A clamps and a wired LAN connection.
- Breaker keeps tripping: Shelly 3EM — its relay can cut a non-essential load before the main breaker trips. Get an LEW to check the DB too.
- Solar or EV: Shelly Pro 3EM 120A — bidirectional metering shows export vs import.
What your appliances really cost to run in Singapore
From 1 October to 31 December 2026, the SP Group household tariff is about 28.6 cents per kWh before GST (roughly 31.2 cents with 9% GST). Here's what that means for typical loads — the kind of numbers an energy monitor shows you on day one:
| Appliance (example) | Typical use | Energy / month | Cost / month* |
|---|---|---|---|
| Aircon compressor, ~1.2 kW | 8 hours a night | ~288 kWh | ~S$90 |
| Storage water heater, 3 kW | 1 hour a day | ~90 kWh | ~S$28 |
| "Always-on" standby load, 50 W | 24/7 | ~36 kWh | ~S$11 (S$135/year) |
| 7 kW EV charger | 2 hours a day | ~420 kWh | ~S$131 |
*At ~31.2¢/kWh incl. GST, Q4 2026 SP tariff. Your real numbers depend on your appliances and habits — which is exactly what a monitor reveals.
Most homeowners are surprised by two things: how much the standby load costs over a year, and how much one old aircon or water heater adds compared to a newer one. Seeing it live on your phone is what makes people actually change habits.
What NOT to buy on Amazon.sg
Plenty of energy monitors on Amazon.sg aren't made for Singapore. As electricians, these are the ones we'd steer you away from:
- US "split-phase" monitors (many popular US brands) — designed for 120/240V North American panels. Singapore uses 230/400V. They need extra parts to work here, if at all.
- Smart plugs with US or European (Schuko) plugs — they don't fit Singapore's 3-pin sockets, and adaptors on high loads are a fire risk.
- Cheap no-brand DIN meters with no certification marks — this device sits inside your DB box. It should carry recognised safety marks (e.g. CE).
- EV wallboxes from overseas listings — EV chargers in Singapore must be LTA type-approved and installed by an LEW.
Installing an energy monitor in Singapore: the legal bit
All three meters in this guide go inside your distribution board (DB box). That's live electrical work, and in Singapore it should be done by an EMA-licensed electrician. A badly fitted sensor can loosen connections, overheat, or void your home insurance.
The good news: it's a quick job, and it's best done alongside other work. A sensible path looks like this:
- Pick your meter. Use this guide to choose the best energy monitor Singapore option for your home (free).
- Order it on Amazon.sg — it ships to your door.
- Book an EMA-licensed electrician to fit and set it up. WhatsApp us your order confirmation for a fixed-price install quote.
- Collect 1–2 weeks of data, then make your big decision — rebalance, DB box replacement, 3-phase upgrade or EV charger — with real numbers, not guesses.
WhatsApp us for an install quote
Best energy monitor Singapore FAQ
What is the best energy monitor in Singapore?
The best energy monitor Singapore homeowners can buy in 2026 is the Shelly 3EM for most homes, the Shelly 3EM-63W Gen3 for HDB, condo and single-phase landed homes, and the Shelly Pro 3EM 120A for 3-phase landed homes with solar or an EV. All three are DIN-rail meters built for Singapore's 230/400V 50Hz supply.
Does Singapore's SP app already show my electricity usage?
If you have an SP advanced meter, the SP app shows your whole-home usage in half-hour blocks. It can't show individual appliances, individual circuits, or the balance between phases — that's what a home energy monitor adds.
Can I install an energy monitor myself in Singapore?
DIN-rail energy monitors are installed inside your DB box, which is live electrical work. In Singapore, this should be done by an EMA-licensed electrician for safety and compliance.
Will an energy monitor work on a single-phase HDB or condo supply?
Yes. All three Shelly meters in this guide work on single-phase supplies. On single-phase, their three channels can monitor three separate circuits, such as aircon, water heater and kitchen.
Which energy monitor is best for a 3-phase landed house?
The Shelly Pro 3EM 120A is the strongest choice for 3-phase landed homes because of its 120A clamps, LAN connection and bidirectional metering. The Shelly 3EM is a solid lower-cost alternative.
Can an energy monitor tell me if I need a 3-phase upgrade?
It gives you the evidence. One to two weeks of peak-demand data shows whether your supply is genuinely too small or whether a few clashing loads are the problem. Share the data with your LEW before committing to an upgrade.
Do these meters work with solar panels?
Yes. All three can track energy in both directions, so you can see solar export and import. The Shelly Pro 3EM is the best fit for solar homes.
Do Shelly meters need a hub or subscription?
No. They connect directly to your home Wi-Fi (the Pro 3EM also supports LAN), and the Shelly app is free to use.
Measure first. Spend smarter.
Pick your meter, have it fitted properly, and make your next electrical decision with real data.
Sources: SP Group electricity tariff revision for 1 Oct–31 Dec 2026; Open Electricity Market (SP advanced meters, half-hourly data); LTA EV charger regulations; Shelly product specifications. Product availability and prices on Amazon.sg change — always check the listing before buying.