Description
QEED Single-Phase AC/DC Power Analyser
QI-POWER-485-300 Single Phase AC/DC Power & Energy Meter
The QEED QI-POWER-485-300 is a single-phase AC/DC TRMS power and energy analyser designed for direct measurement of current and voltage. It measures high-current AC/DC systems and provides electrical values through RS485 Modbus RTU for monitoring, logging and automation systems.
Compared with the LV version, the QI-POWER-485-300 is intended for higher-voltage applications. It is suitable for photovoltaic systems, inverter monitoring, AC/DC motor measurement, industrial power monitoring, telecom power, UPS and high-current energy applications.
Current Range
Up to 300A AC / 400A DC
Voltage Range
Up to 800Vac / 1000Vdc
Communication
RS485 Modbus RTU
Energy
Bidirectional energy totaliser
Overview
QI-POWER-485-300 is designed for single-phase AC/DC power measurement where current, voltage, power, energy, frequency, power factor and THD need to be read digitally by a Modbus master. It is especially useful where conventional AC-only meters cannot measure DC systems or variable-frequency applications.
The device can be configured through FACILE / Q-WIZARD software using an RS485-USB connection, or directly by using the Modbus register map. It supports DIN rail mounting and can be installed horizontally or vertically depending on the panel layout.
Positioning: High-current single-phase AC/DC Modbus power meter for PV, inverter, motor, UPS, telecom, industrial monitoring and IoTWatt 4.0 integration.
Key Features
AC/DC TRMS Measurement
Measures both AC TRMS and DC current / voltage values for mixed AC/DC applications.
300A AC / 400A DC
Supports high-current direct measurement without external CTs for many applications.
High Voltage Input
Suitable for voltage measurement up to 800Vac or 1000Vdc.
RS485 Modbus RTU
Provides Modbus data for PLC, SCADA, EMS, BMS, datalogger and IoT gateway systems.
Bidirectional Energy
Measures positive and negative energy for import / export and generation / consumption monitoring.
Configurable Filtering
Filter setting can be adjusted for faster response or more stable measurement values.
Measurements Available via RS485
| Measurement Group |
Available Values |
| Current |
IRMS, Ipeak, minimum and maximum current values |
| Voltage |
VRMS, Vpeak, minimum and maximum voltage values |
| Power |
Active power W, reactive power VAR and apparent power VA |
| Energy |
Bidirectional energy totaliser, positive and negative kWh |
| Power Factor |
Cosφ |
| Frequency |
Frequency value, with option to measure frequency from current channel |
| Power Quality |
THD, voltage peak and current peak visibility |
Typical Applications
PV Plants
Measure string, combiner or inverter-side current, voltage, power and energy values.
Inverter Monitoring
Suitable for variable-frequency measurement from DC up to 400Hz.
AC/DC Motors
Measure current, voltage, power factor, active power, reactive power and apparent power.
UPS and Telecom
Monitor AC/DC power and energy in backup power, DC systems and radio base station applications.
Industrial Energy Monitoring
Use as a Modbus power analyser for industrial panels, machines and power distribution equipment.
IoTWatt 4.0
Can be integrated through RS485 gateways into IoTWatt 4.0 dashboards, reports and analytics.
Technical Specifications
| Parameter |
Specification |
| Product Type |
Single-phase AC/DC TRMS power and energy analyser |
| Power Supply |
9 to 30Vdc, with polarity reversal and over-temperature protection |
| Absorption |
< 1.3W |
| Current Measurement |
Up to 300A AC or 400A DC |
| Voltage Measurement |
Up to 800Vac or 1000Vdc |
| Working Frequency |
DC or 1 to 400Hz |
| Sampling Rate |
Approx. 12kHz at 50Hz |
| Accuracy Reference |
Voltage, current and active power: < 0.5% F.S.; energy: approx. ±1% of reading; frequency: ±0.1Hz |
| Output |
RS485 Modbus RTU |
| Baud Rate |
1200 to 115200 baud, standard 9600 |
| Input Impedance |
1MΩ ±1% |
| Overvoltage Protection |
Category III up to 600V; Category II up to 1000V |
| Isolation |
3kV on bare wire for current measurement; 4kV on voltage input |
| Protection Index |
IP20 |
| Operating Temperature |
-15°C to +65°C |
| Storage Temperature |
-40°C to +85°C |
| Humidity |
10% to 90%, non-condensing |
| Dimensions |
46.1 x 63 x 26.4mm, terminals excluded |
| Weight |
Approx. 370g for 300A version |
| Enclosure |
V0-rated enclosure material, epoxy resin filled |
Configuration
Using an RS485-USB serial link, the QI-POWER-485-300 can be connected to the FACILE / Q-WIZARD configuration software. The same device can also be programmed directly using the Modbus register map from a supervisory or master system.
- Set Modbus address
- Set baud rate and Modbus response delay
- Configure CT and VT transformation ratio
- Select RMS or DC measurement mode
- Adjust filtering from fast response to stable measurement
- Select frequency measurement from current channel if required
- Configure minimum current cut-off threshold
- Configure minimum power cut-off threshold
- Enable energy saving on device flash memory
- Restore factory default settings
Commissioning note: Set the DIP switches correctly for FACILE / Q-WIZARD configuration or direct RS485 configuration. After changing settings, save the configuration through the command register and power-cycle the device where required.
FACILE / Q-WIZARD Software Functions
| Function |
Purpose |
| Type of Measure |
Select RMS or DC-only measurement behaviour and polarity handling. |
| Save on Energy Flash |
Allows the energy counters to be saved directly on the device flash memory. |
| Report of Transformation |
Defines current and voltage transformation ratio. Default ratio is 1:1. |
| Filter |
Adjusts reading response for faster output or more stable measurement. |
| Minimum Current Threshold |
Sets current cut-off value. Below this value the device reads zero. |
| Minimum Power Threshold |
Sets power cut-off value. Below this value the device reads zero. |
| Factory Default |
Restores the device to the default configuration. |
RS485 Modbus Integration
QI-POWER-485-300 can be connected into an RS485 Modbus RTU network and read by PLC, SCADA, EMS, BMS, Modbus gateway, datalogger, IoT gateway or IoTWatt 4.0. It is suitable for both temporary commissioning checks and permanent energy monitoring installations.
- Use unique Modbus addresses for multiple devices on the same RS485 bus
- Verify baud rate, parity and Modbus response delay during commissioning
- Confirm voltage and current scaling before live monitoring
- Use a USB-RS485 converter for local configuration and testing
- Use an RS485 gateway for cloud dashboards and IoTWatt 4.0 integration
Installation Note
The QI-POWER-485-300 can be mounted horizontally or vertically depending on panel space and conductor routing. For high-voltage and high-current applications, installation should be carried out with proper isolation, safe working procedures, correct conductor routing and verification of voltage category.
Selection note: Use the QI-POWER-485-300 for higher voltage applications. Use the QI-POWER-485-300-LV where the system is limited to low-voltage measurement up to 80Vac / 100Vdc.
QI-POWER-485-300 Supply and Integration
Saturn Pyro supports QEED QI-POWER-485-300 single-phase AC/DC power meters for PV systems, inverters, AC/DC motors, UPS, telecom, industrial monitoring, RS485 Modbus integration, IoT gateway connection and IoTWatt 4.0 projects in Malaysia.
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