Growatt TPM-6CTA-C-100 3-Phase 100A Smart Meter RS485

The TPM-6CTA-C-100 electricity meter from Growatt (MPN: TPM-6CTA-C-100) is a three-phase smart meter designed for the precise measurement of energy flows in photovoltaic systems. Thanks to external clamp-on current transformers (CTs), an RS485 interface, and Modbus RTU communication, the meter is particularly well-suited for integration into Growatt inverter systems. It enables reliable monitoring of energy consumption as well as feed-in and purchased power and supports functions such as self-consumption optimization and export limitation. It is installed in a space-saving manner on a DIN rail.

Precise energy monitoring for three-phase PV systems

• 3-phase smart meter for power grids up to 100 A
• Class 1 measurement accuracy for reliable consumption and feed-in measurement
• External clamp-on current transformers (CTs) for easy retrofitting without interrupting power lines
• RS485 communication with Modbus RTU for integration into compatible Growatt systems
• LCD display for local viewing of key measurement values
• DIN rail mounting for installation in a control cabinet
• Supports self-consumption optimization and power limiting with compatible inverters
• Suitable for new installations and retrofitting existing PV systems

Function and Application

The electricity meter continuously measures the electrical parameters of a three-phase power grid. The recorded values are transmitted via the integrated RS485 interface using Modbus RTU to a compatible Growatt inverter. This allows the energy management system to evaluate current power consumption or feed-in and control various smart functions. It is suitable for both new photovoltaic systems and retrofitting existing systems. Since current measurement is performed via flip-open current transformers, the existing conductors do not need to be disconnected in many cases, which simplifies installation.

Compatibility

The Smart Meter was developed to work with compatible three-phase Growatt inverters. It serves as an external measurement unit for recording energy flow and is particularly needed for applications involving functions such as:

• self-consumption optimization,
• export or feed-in limitation,
• load monitoring, or
• detailed energy monitoring

are to be utilized.

Current Measurement with Clamp-On Current Transformers

It operates with external current transformers (CTs). These measure current non-contact via the conductor’s magnetic field and enable safe measurement of high currents without requiring the load current to pass directly through the meter. The included current transformers are rated for applications up to 100 A and have an inner diameter of 16 mm. This measurement principle is particularly well-suited for retrofits, as the conductors simply need to be routed through the open current transformer and then closed again.

Technical Specifications

Electric Meter

• Mounting: DIN top-hat rail
• Operating temperature: -25 °C to +55 °C
• Storage temperature: -40 °C to +70 °C
• Permissible humidity: <75% (non-condensing)
• Electrical Specifications
• Power supply type: 3P4W
• Voltage range:
• 100–415 V (L-L)
• 57.7–240 V (L-N)
• Frequency: 50/60 Hz
• Maximum measurement current: 100 A
• Voltage measurement accuracy: 0.5%
• Current measurement accuracy: 0.5%
• Power measurement accuracy: 1%
• Frequency accuracy: ±0.2%
• Communication
• Interface: RS485
• Communication protocol: Modbus RTU
• Baud rate: 9600
• Weight: approx. 230 g
• Dimensions (W × H × D): 100 × 72 × 65.5 mm

Current transformers

• Current transformer cable length: 6 m
• Secondary current: 40 mA
• Inner diameter: 16 mm

Package Contents

1x Growatt TPM-6CTA-C-100 Smart Meter
2x 3-pole current transformers (CT)
1x RS485 communication cable (15 m)