WEM3046TE vs WEM3046T: Double-CT Installation Wi-Fi Energy Meter
Introduction
IAMMETER has released WEM3046TE, a variant of the popular WEM3046T three-phase Wi-Fi energy meter. While both devices share the same measurement accuracy and communication features, WEM3046TE is specially designed for Double-CT installation.
This blog explains what Double-CT installation means, why it matters in real-world projects, and how to decide between WEM3046TE and WEM3046T.
| WEM3046T | WEM3046TE |
|---|---|
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| Wi-Fi Energy Meter 1 2.4G Wi-Fi Antenna 1 |
Wi-Fi Energy Meter 1 Current transformer 3*10 mm, 5A , split-core 2.4G Wi-Fi Antenna 1 |
What is Double-CT Installation?
In many retrofit projects, the main CTs are already occupied by the utility energy meter. Installers are often not allowed to modify these connections or share the CTs.
WEM3046TE solves this issue by using secondary clamp-on CTs (5A, 10 mm opening) that clip directly onto the wires of the main CTs, instead of the main power cables.
Advantages of Double-CT installation:
- ✅ Non-intrusive retrofit: no need to rewire existing CTs or touch the utility meter.
- ✅ Fast and safe installation: just clamp on the CTs—ideal for projects under strict compliance.
- ✅ Perfect for space-limited panels: no need to mount larger CTs on thick cables.
Key Differences: WEM3046TE vs WEM3046T
| Feature | WEM3046T | WEM3046TE |
|---|---|---|
| CT input | Direct 5A secondary CT input; can be connected in series with existing CTs (if permitted) | Double-CT installation: clamp-on CTs on the leads of main CTs |
| Installation type | Semi-intrusive: requires direct wiring to 5A CTs | Fully non-intrusive: no rewiring of main CTs required |
| Package | Main unit + antenna (no CTs included). Optional 1500A kit with Class 0.5 CTs | Main unit + antenna + 3 × 5A clamp-on CTs (10 mm opening) |
| Best for | New installations; projects requiring high-current measurement (up to 1500A with optional kit) | Retrofit projects; utility CT cannot be shared; limited panel space |
| Target users | Installers who can manage CT wiring | Engineers upgrading existing systems, especially under compliance limits |
Wiring diagram of WEM3046T
Wiring diagram of WEM3046TE
When Should You Choose Each Model?
- Choose WEM3046TE if:
- You cannot modify the existing CTs connected to the utility meter.
- The panel has no space for large CTs.
- You need a non-intrusive, quick retrofit solution.
- Choose WEM3046T if:
- You are designing a new system where 5A CT wiring is accessible.
- You need to measure very high current (up to 1500A with external CTs).
- You are allowed to connect in series with existing 5A CTs.
Installation Notes for WEM3046TE
- 🔄 Clamp direction: Ensure correct orientation (K → L or S1 → S2). A reversed direction will cause negative power readings.
- 🛠 Stable clamping: The included clamp-on CTs must firmly grip the wires of the main CTs.
- ✅ Verification: After installation, cross-check the measured phases and power direction with the actual site condition.
Package Options
- WEM3046T Standard Package
- Main unit + external antenna
- No CTs included
- Optional 1500A kit (with 3 × Class 0.5 CTs)
- WEM3046TE Standard Package
- Main unit + external antenna
- 3 × 5A clamp-on CTs (10 mm opening) included by default
FAQs
1. What is the main difference between WEM3046T and WEM3046TE?
WEM3046T requires direct wiring to 5A CTs, while WEM3046TE uses secondary clamp-on CTs that attach to the main CT leads.
2. Can WEM3046TE be used for residential solar monitoring?
Yes. Both WEM3046T and WEM3046TE can monitor solar PV systems, grid import/export, and household consumption. The choice depends on whether you can access or modify the CT connections.
3. Does Double-CT installation affect measurement accuracy?
Slightly. Since WEM3046TE relies on clamp-on CTs measuring the current of another CT’s leads, accuracy may be lower than direct CT wiring. However, it is still suitable for most monitoring applications where non-intrusive installation is the priority.
4. Which model should I choose for industrial projects?
- If you need to measure very high currents (up to 1500A) and can wire CTs directly → WEM3046T.
- If the utility CT cannot be touched, and safety or compliance requires a non-intrusive retrofit → WEM3046TE.
5. Do these two models include all the other features of IAMMETER three-phase meters?
Yes. Compared with other IAMMETER three-phase meters, the only difference is the CT input form. Both WEM3046T and WEM3046TE still provide all the standard features, including reactive power and reactive energy measurement, net metering, open API, and MQTT support.
Conclusion
WEM3046TE is not a replacement for WEM3046T—it’s a complementary solution designed for specific scenarios.
- If you can connect directly to 5A CTs → WEM3046T is the right choice.
- If you need a non-intrusive retrofit and cannot alter existing CTs → WEM3046TE is the perfect fit.
With both options available, IAMMETER ensures that whether you are building a new installation or upgrading an existing system under strict compliance, you always have the right Wi-Fi energy meter for the job.
👉 Learn more and compare models
[WEM3046TE Vs WEM3046T](WEM3046T & WEM3046TE Three-Phase Wi-Fi Energy Meters - IAMMETER?utm_source=0826news)
