The Growatt TPM-6CTA-C-100 electricity meter (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 analyze current electricity 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 metering 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 measuring device. The included current transformers are designed for applications up to 100 A and have an inner diameter of 16 mm. This measurement principle is particularly suitable 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)
Power supply type: 3P4W
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%
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)
