Description
Measuring commercial currents of any scale with external CTs.
GoodWe GM330 is a commercial three-phase smart energy meter with Class 0.5S high precision and external CT inputs (5 A / 1 A secondary), engineered to provide utility-grade telemetry for GoodWe commercial hybrid inverters and SEC power controllers across heavy industrial switchboards.
Supports High-Current External CTs
Interfaces with external current transformers to measure commercial facilities of any size (from 100 A up to thousands of amps).
Class 0.5S High Precision Metering
Utility-grade measurement accuracy for dynamic export limiting, commercial peak shaving, and sub-billing analytics.
Direct Integration with GoodWe SEC & ET Inverters
High-speed RS485 Modbus telemetry ensures instantaneous closed-loop power modulation.
Standard 35 mm DIN-Rail Mounting (72 mm)
Compact industrial casing fits neatly into main commercial electrical distribution cabinets.
More product details
Commercial switchboards carry hundreds or thousands of amps that cannot pass directly through inline meters. The GM330 connects to external 5 A or 1 A secondary current transformers clamped around heavy main busbars.
- Configurable transformation ratio in software matches any external CT specification (e.g., 200/5 A, 400/5 A, 1000/5 A).
- Measures three-phase active power, reactive power, power factor, and bidirectional energy flow.
- Class 0.5S precision ensures accurate dynamic export limitation and tariff arbitrage control.
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High-speed synchronization with GoodWe SEC controllers and inverters.
The GM330 communicates over an isolated RS485 twisted-pair bus, delivering real-time power telemetry to GoodWe commercial inverters and SEC energy controllers. High-speed Modbus RTU protocol pre-configured for GoodWe commercial inverters and SEC controllers. Backlit LCD display shows real-time line voltages, line currents, frequency, and active power per phase. Low internal standby power draw (< 3 W) ensures minimal parasitic system losses.
Takes external 5 A secondary CTs
The meter accepts nA : 5A secondary inputs from external current transformers. Transformers are not supplied and can be sized to any main incomer.
Runs from 100 to 472 V AC
Supports 1P2W, 3P3W, and 3P4W networks across a wide 100 to 472 V AC window with Class 0.5 active and Class 1 reactive precision.
Fits a four-module 72 mm footprint
Measuring 72 x 85 x 72 mm and weighing 240 g, the IP20 housing mounts to standard 35 mm rail and runs between minus 30 and 70 °C.
Technical data
Utility-grade Class 0.5S energy telemetry for commercial solar-plus-storage and power plant control.
Commercial three-phase smart meter compatible with high-current external CTs.
Engineered for commercial and industrial facilities with service currents exceeding standard residential direct-connect limits, the GM330 interfaces with external 5 A / 1 A secondary current transformers. It delivers precise 3-phase telemetry to GoodWe commercial hybrid inverters (ET 15–50 kW, ETC, BTC) and SEC energy controllers across large main switchboards.
- Utility Precision
- Class 0.5S
- External CT Inputs
- 5 A / 1 A
- 4U DIN-Rail Format
- 72 mm
- Fast Telemetry
- < 1s
Measurement
- Supported grid types
- 1P2W / 3P3W / 3P4W
- Connection
- External current transformers, nA:5A (CTs NOT supplied)
- Operating voltage, 3P4W (Vac)
- 100 ~ 472 L-N
- Operating voltage, 3P3W (Vac)
- 100 ~ 472 L-L
- Frequency (Hz)
- 50 / 60
- Current transformer ratio
- nA : 5A
- Accuracy, voltage / current
- Class 0.5
- Accuracy, active energy
- Class 0.5
- Accuracy, reactive energy
- Class 1
Communication
- Method
- RS485
- Distance (m)
- 1000
Physical
- Ingress protection
- IP20
- Operating temperature (°C)
- -30 ~ +70
- Dimensions (W × H × D, mm)
- 72 × 85 × 72
- Housing
- 4 modules
- Mounting
- DIN rail
- Weight (g)
- 240
- Power consumption (W)
- < 5
- User interface
- 4 LED, reset button
Logistics
- Packaging (VPE)
- 1 per carton, 240 per pallet
Project fit
Where this model fits.
Scenarios that show which projects the GoodWe GM330 belongs in, what to verify before quoting, and when another model is the better pick.
Commercial & Industrial Solar Installations with High Service Amperage (>100 A)
Factories, warehouses, and commercial offices installing GoodWe ET 15–50 kW or ETC/BTC inverters where main service currents exceed 80 A.
Connects to standard external 5 A CTs (such as MBS KBU 58 or Chint BH-0.66) to measure commercial switchboards of any current rating.
- Confirm this model against the adjacent rating in the same family
Documents
GoodWe GM330 datasheet (EN) GoodWe GM330 DatasheetProduct questions
Does this meter include the current transformers (CTs) in the box?
No. GM330 is the standalone meter; select CTs separately or buy the GMK330 kit. The standalone GM330 meter allows installers to connect third-party or existing external CTs (5 A or 1 A secondary). If you need pre-packaged split-core CTs bundled in the box, choose the GoodWe GMK330 kit.
What is the significance of Class 0.5S accuracy for commercial solar?
Maintains high precision even when the factory is running at light loads. The "S" in Class 0.5S indicates extended accuracy at low current levels (down to 1% of rated current). This ensures that when the factory is nearly idle (e.g., weekends or nighttime), the meter still measures small power flows accurately, preventing unauthorized reverse-power export.