Description
QEED Single-Phase AC/DC Power Meter
QI-POWER-485-LV Single Phase AC/DC Power & Energy Meter
The QEED QI-POWER-485-LV is the low-voltage version of the QI-POWER-485 single-phase power and energy meter. It is designed to measure TRMS AC or DC current and voltage, calculate electrical power values and transmit measurements through RS485 Modbus RTU.
The device is suitable for low-voltage AC/DC applications, battery systems, telecom power, DC motor monitoring, data centres, renewable energy support systems, laboratory panels and industrial equipment where compact Modbus metering is required.
Measurement
Single-phase AC/DC TRMS
Voltage Version
Low-voltage input version
Communication
RS485 Modbus RTU
Energy
Bidirectional energy metering
Overview
QI-POWER-485-LV is used when current, voltage, power, energy and basic power quality values need to be measured from a compact DIN rail device and read by a Modbus master. The LV version is intended for low-voltage applications compared with the standard higher-voltage QI-POWER-485 version.
Through RS485 Modbus RTU, the device provides measurements such as current, voltage, active power, reactive power, apparent power, peak values, frequency, power factor, bidirectional energy and THD. It can be configured by software or by Modbus register map.
Positioning: Compact low-voltage single-phase AC/DC Modbus power meter for industrial monitoring, DC systems, energy logging and IoT / EMS integration.
Key Features
Low Voltage Version
Designed for low-voltage AC/DC measurement applications where the standard high-voltage version is not required.
TRMS Measurement
Measures RMS AC or DC current and voltage, suitable for non-ideal electrical waveforms.
RS485 Modbus RTU
Integrated RS485 Modbus RTU output for PLC, SCADA, EMS, BMS, IoT gateway and datalogger systems.
Bidirectional Energy
Supports positive and negative energy measurement for consumed and generated energy applications.
THD Available
Provides THD value through RS485 for basic waveform distortion visibility.
Configurable Filter
Filtering can be adjusted for faster response or more stable measurement values.
Measurements Available via RS485
| Measurement Group |
Available Values |
| Current |
IRMS, Ipeak |
| Voltage |
VRMS, Vpeak |
| Power |
Active power W, reactive power VAR, apparent power VA |
| Energy |
Bidirectional energy kWh, positive and negative |
| Power Factor |
Cosφ |
| Frequency |
Frequency value, with option to measure frequency on current channel instead of voltage channel |
| Power Quality |
THD value available through RS485 |
Strengths
- Low-voltage version of the QI-POWER-485 single-phase power meter
- TRMS AC/DC current and voltage measurement
- 0.5% accuracy reference
- Integrated RS485 Modbus RTU communication
- Bidirectional energy metering for imported and exported energy
- DIN rail mounting, suitable for compact panel installation
- Fully configurable by free QI-POWER-485 interface software or Modbus registers
- Firmware update through bootloader function
- Measurement register format selection: MSW first, LSW first or hundredths
Typical Applications
DC Power Systems
Suitable for low-voltage DC panels, battery systems and DC bus monitoring.
Telecommunication Sites
Useful for telecom DC power monitoring and energy visibility.
Data Centres
Can be used for low-voltage AC/DC monitoring in critical infrastructure panels.
Battery Monitoring
Supports AC/DC power and bidirectional energy measurement for battery-related systems.
Motor Control
Suitable for low-voltage DC motor power and energy monitoring applications.
IoTWatt 4.0
Can be integrated through RS485 gateways into IoTWatt 4.0 dashboards and analytics.
Technical Specifications
| Parameter |
Specification |
| Product Type |
Single-phase AC/DC TRMS power and energy meter |
| Version |
Low-voltage version of QI-POWER-485 |
| Current Measurement |
QI-POWER-485-LV family supports AC/DC current measurement, model dependent |
| Voltage Measurement |
Low-voltage AC/DC voltage measurement, model dependent |
| Power Supply |
9 to 30 Vdc, with reverse polarity and over-temperature protection |
| Accuracy Reference |
Voltage, current and active power: < 0.5% F.S. at 25°C up to 400Hz |
| Type of Measurement |
RMS or DC |
| Output |
RS485 Modbus RTU |
| Configuration |
Q-WIZARD / FACILE QI-POWER-485 software or Modbus register map |
| Mounting |
DIN rail mounting, horizontal or vertical |
| Galvanic Isolation |
4kV isolation for voltage input |
Selection note: Confirm the exact QI-POWER-485-LV variant, voltage range and current range before ordering, especially when measuring AC/DC battery systems, DC buses or non-standard low-voltage applications.
Configuration Options
The device can be configured using a USB-RS485 serial link and the free QI-POWER-485 configuration software. Configuration can also be done directly through the Modbus register map when using a Modbus master system.
- Modbus address setting
- Baud rate setting
- Communication delay setting
- Current transformer and voltage transformer ratio setting
- RMS or DC type of measurement selection
- Filter setting from faster response to more stable measurement
- Frequency measurement selection on current channel instead of voltage channel
- Energy counter saving on device flash memory
- Minimum current cut-off threshold
- Minimum power cut-off threshold
FACILE / Q-WIZARD Software Functions
| Function |
Purpose |
| Type of Measure |
Select RMS or DC-only measurement to define positive or negative reading behaviour. |
| Save on Energy Flash |
Allows energy counters to be saved directly on the device flash memory. |
| Report of Transformation |
Defines CT and / or VT transformation ratio. Default ratio is 1:1. |
| Filter |
Adjusts reading response: lower value for faster response, higher value for more stable measurement. |
| Minimum Current Threshold |
Sets current cut-off; below this value the device measures zero. |
| Minimum Power Threshold |
Sets power cut-off; below this value the device measures zero. |
| Factory Default |
Restores default configuration settings. |
RS485 Modbus Integration
QI-POWER-485-LV can be integrated into RS485 Modbus RTU networks for central monitoring and logging. It can be connected to PLC, SCADA, BMS, EMS, data logger, IoT gateway, Modbus TCP gateway or IoTWatt 4.0 depending on the system architecture.
- Use RS485 Modbus RTU for remote power and energy monitoring
- Connect multiple meters on the same RS485 bus with unique Modbus addresses
- Use a USB-RS485 converter for configuration and commissioning
- Use a gateway for cloud monitoring or IoTWatt 4.0 integration
- Verify baud rate, parity, address and register mapping during commissioning
Commissioning note: Set the DIP switches and software configuration according to the intended method. After configuration, save the setting and power-cycle the device before normal operation if required by the setup procedure.
QI-POWER-485-LV Supply and Integration
Saturn Pyro supports QEED QI-POWER-485-LV single-phase AC/DC low-voltage power meters for energy monitoring, battery system monitoring, DC power measurement, RS485 Modbus integration, IoT gateway connection and IoTWatt 4.0 projects in Malaysia.
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Malaysia
