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Energy Meter Sizing Calculator

Which 3-phase energy meter do you need for your factory, office or data centre? Enter connected load, peak current, and circuit count — get a CT rating, a meter count, and a cloud connectivity plan.

Inputs

Result

Recommended product
Titan (3-phase CT)
Class 0.5S, DIN rail, 4 modules, WiFi + Ethernet + RS485
Main incomer CT rating
800 A
Meters required
12units
Total facility load
500kW
Use a mix of WiFi and Ethernet depending on panel location; MQTT to the Energy Intelligence Platform handles aggregation.
For rapid audits or temporary deployment, specify Titan Audit — same metrology engine, with split-core CTs that clamp on live conductors (no shutdown).

How this works

Sizing a 3-phase energy meter comes down to three decisions: (1) the CT rating for the main incomer based on peak current; (2) the number of meters based on how many circuits you want visibility on; (3) the communication architecture — WiFi is sufficient for under 20 meters, MQTT over the facility network is cheaper at 20+ meters.

The Titan 3-phase smart energy meter covers the range: 100 / 200 / 400 / 800 A CTs, Class 0.5S accuracy, WiFi + Ethernet + RS485 all built in, 4 DIN rail modules. For audit use or temporary deployment, the Titan Audit variant uses split-core clamp-on CTs — zero-downtime install.

Frequently asked questions

Two decisions: (1) CT rating on the main incomer — match the expected peak current with some headroom (100 A, 200 A, 400 A, 800 A are standard ratings); (2) number of meters — one on the main incomer plus one on each major feeder you want to monitor separately. Most facilities start with 5–15 meters and expand.
No — only on circuits you want to analyse separately. A typical factory deploys one meter on the main incomer (for bill reconciliation + total load tracking), one per major system (compressor, HVAC plant, chiller plant, lighting feeder, production lines), and optionally one per tenant or cost centre. Over-metering is common; start with the 10–15 biggest loads.
Match the CT ratio to your expected peak current with ~20% headroom. For a main incomer drawing 600 A peak, use an 800/5 CT. For a 180 A motor feeder, use a 200/5 CT. The Titan meter accepts 100/200/400/800 A CT options — specify with the order. Current ratings below 100 A typically use direct connection or smaller LVCTs.
For permanent installation with split-core CTs, no — the CTs clamp around live conductors. For conventional toroidal CTs you need a shutdown to thread the CT over the conductor. Use Titan Audit (split-core CTs) for zero-downtime install, or schedule Titan permanent install during a planned maintenance window.
Same Class 0.5S metrology engine. Titan uses permanent toroidal CTs for fixed installation (best for long-term sub-metering). Titan Audit uses split-core clamp-on CTs for zero-downtime deployment (best for audits, temporary monitoring, or retrofits where shutdown is impossible). Both share the same app, data platform, and cloud backend.

Related pages & tools

Titan Smart Energy Meter

Class 0.5S 3-phase DIN rail meter with built-in WiFi, Ethernet, RS485.

Learn More →

Titan Audit — Energy Logger

Split-core CT energy logger for zero-downtime audit or retrofit installation.

Learn More →

kVA to kW Calculator

Convert kVA to kW and Amps to kW — useful when translating nameplate loads to real current draw.

Learn More →

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