Description
QEED Single-Phase AC/DC Power Meter
QI-POWER-485-300-LV Single Phase AC/DC Power & Energy Meter
The QEED QI-POWER-485-300-LV is the low-voltage version of the QI-POWER-485 single-phase power meter. It measures RMS AC or DC current and voltage, calculates power and energy values, and provides the measured data through RS485 Modbus RTU.
It is suitable for low-voltage AC/DC energy monitoring applications such as DC motor control, telecom systems, UPS, battery monitoring, data centres, hydro, wind, aviation and shipbuilding systems where the electrical frequency or waveform may vary.
Current Range
Up to 300A AC / 400A DC
Voltage Range
Up to 80Vac / 100Vdc
Communication
RS485 Modbus RTU
Energy
Bidirectional energy metering
Overview
QI-POWER-485-300-LV is designed for single-phase low-voltage AC/DC measurement. Through one compact device, users can monitor current, voltage, power, energy, frequency, power factor and THD from an RS485 Modbus master system.
The meter can be mounted horizontally or vertically using DIN rail clips or screw mounting. It is useful for compact panels, equipment skids, battery systems and industrial monitoring panels where standard AC energy meters are not suitable for DC or variable-frequency applications.
Positioning: Compact low-voltage AC/DC Modbus power and energy meter for DC systems, batteries, UPS, telecom, data centre and variable-frequency applications.
Key Features
AC/DC Measurement
Measures RMS AC or DC current and voltage for low-voltage single-phase systems.
300A AC / 400A DC
Supports current measurement up to 300A AC or 400A DC.
80Vac / 100Vdc
Supports low-voltage measurement up to 80Vac or 100Vdc.
RS485 Modbus RTU
Integrated Modbus RTU output for PLC, SCADA, EMS, BMS, datalogger and IoT gateway systems.
Bidirectional Energy
Measures positive and negative energy for import / export and charge / discharge applications.
THD and Peak Values
Provides THD, voltage peak and current peak values through RS485.
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 |
Watt, VAR and VA |
| Energy |
Bidirectional energy, positive and negative energy values |
| Power Factor |
Cosφ |
| Frequency |
Frequency value, with option to calculate frequency from current channel |
| Power Quality |
THD |
Typical Applications
Battery Monitoring
Monitor DC voltage, current, power and bidirectional energy for battery systems.
UPS Systems
Useful for UPS DC link and low-voltage AC/DC power monitoring.
Telecom Power
Suitable for telecom DC power systems and remote equipment monitoring.
Data Centres
Supports low-voltage power monitoring for critical infrastructure and DC-backed systems.
DC Motor Control
Measure current, voltage, power and energy in DC motor control applications.
Renewable Energy
Applicable for hydro, wind and variable-frequency or mixed AC/DC systems.
Technical Specifications
| Parameter |
Specification |
| Product Type |
Power / energy meter, single-phase AC/DC, RS485 Modbus |
| Power Supply |
9 to 30 Vdc, with polarity reversal and over-temperature protection |
| Absorption |
< 1.3 W |
| Measurement |
IRMS, VRMS, W, VAR, VA, Vpk, Ipk, frequency, Cosφ, bidirectional energy, THD, min and max values |
| Type of Measure |
TRMS or DC |
| Current Range |
Up to 300A AC or 400A DC |
| Voltage Range |
Up to 80Vac or 100Vdc |
| Accuracy at 25°C up to 200Hz |
Voltage, current and active power: < 0.5% F.S.; frequency: ±0.1Hz; energy: ±1% of reading; Vpeak / Ipeak: ±5% F.S. |
| Output |
RS485 Modbus RTU |
| Baud Rate |
1200 to 115200 baud |
| Working Frequency |
DC or 1 to 400Hz |
| Sampling Rate |
11k samples per second |
| Input Impedance |
1MΩ ±1% |
| Overvoltage Category |
Cat IV up to 100V |
| Isolation |
3kV on bare wire for current measurement; 4kV for voltage measurement |
| Protection Index |
IP20 |
| Operating Temperature |
-15°C to +65°C |
| Storage Temperature |
-40°C to +85°C |
| Humidity |
10% to 90%, non-condensing |
| Dimensions |
89.1 x 99.25 x 28.5 mm, terminals excluded |
| Weight |
370g |
| Mounting |
DIN rail clips or screw mounting, horizontal or vertical |
Configuration
The QI-POWER-485-300-LV can be configured using a USB-RS485 serial link and the free FACILE QI-POWER-485-300-LV software. It can also be configured directly using the Modbus register map from a Modbus master system.
- Modbus address setting
- Baud rate setting
- Response delay setting
- Current and voltage transformation ratio setting
- Filter adjustment for fast response or stable measurement
- Frequency measurement selection from current channel
- Energy saving on flash memory
- Minimum current cut-off threshold
- Minimum power cut-off threshold
- Factory default restore function
FACILE QI-POWER-485 Functions
| Function |
Purpose |
| Type of Measure |
Select RMS or DC-only measurement to define positive or negative reading behaviour. |
| Save on Energy Flash |
Enables 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 from faster response to more stable and accurate measurement. |
| Minimum Current Threshold |
Sets current cut-off; below this value the device reads zero. |
| Minimum Power Threshold |
Sets power cut-off; below this value the device reads zero. |
| Factory Default |
Restores the device to default configuration. |
RS485 Modbus Integration
QI-POWER-485-300-LV can be connected to an RS485 Modbus RTU network and read by PLC, SCADA, EMS, BMS, Modbus gateway, datalogger, IoT gateway or IoTWatt 4.0. The device supports standard Modbus function codes for reading and writing registers.
- Use A+ and B- connections according to Modbus RTU wiring practice
- Assign unique Modbus address when multiple devices share the same RS485 bus
- Confirm baud rate, parity and response delay during commissioning
- Use Modbus register map for integration into third-party systems
- Use RS485 gateway for cloud monitoring and IoTWatt 4.0 integration
Commissioning note: Any DIP-switch change may require power cycling or a reset command. Save configuration through the command register before returning the DIP switches to the required normal operating mode.
Installation Note
High-intensity magnetic fields can affect measurement values. Avoid installation near permanent magnets, electromagnets or iron masses that may strongly change the magnetic field. If irregular measurement behaviour is observed, reorient or move the device to a more suitable location.
QI-POWER-485-300-LV Supply and Integration
Saturn Pyro supports QEED QI-POWER-485-300-LV power and energy meters for AC/DC low-voltage monitoring, battery systems, UPS, telecom power, DC motor control, RS485 Modbus integration, IoT gateway connection and IoTWatt 4.0 projects in Malaysia.
Enquire Now
More detail about Saturn Pyro Sdn Bhd
Malaysia
