F&F Electricity energy meter LE-03MW
Measures 3-phase bidirectional active, reactive, and apparent energy with multi-tariff support.
The F&F LE-03MW is a MID-compliant 3-phase 2-wire electricity meter for direct measurement up to 80A. This Modbus RTU template reads voltages, currents, active/reactive/apparent power, power factor, frequency, and bidirectional energy across 4 tariff zones.
- Protocol
- Modbus RTU
- Connection
- RS485, 19200 baud
- Registers
- 66, read only
- Brand
- F&F
- Key readings
- Voltage L1 to L3 · Current L1 to L3 · Active power L1 to L3 and total · Reactive and apparent power · Consumed and exported active energy · Power factor L1 to L3
- Compatible models
- LE-03MW
- Last updated
Registers (66)
66 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Consumed active energy | kWh | Read | |||
| Exported active energy | kWh | Read | |||
| Total reactive energy | kWh | Read | |||
| Consumed reactive energy | kWh | Read | |||
| L2 phase - consumed active energy | kWh | Read | |||
| L2 phase - exported active energy | kWh | Read | |||
| L2 phase - reactive energy | kWh | Read | |||
| Active Energy Σ T2 | kWh | Read | |||
| L1 phase - consumed active energy | kWh | Read | |||
| L1 phase - exported active energy | kWh | Read | |||
| L1 phase - reactive energy | kWh | Read | |||
| L1 phase - consumed reactive energy | kWh | Read | |||
| L3 phase - consumed active energy | kWh | Read | |||
| L3 phase - exported active energy | kWh | Read | |||
| L3 phase - reactive energy | kWh | Read | |||
| Active Energy Σ T2, exp | kWh | Read | |||
| Total Active Energy Σ (T1_T2), imp | kWh | Read | |||
| Total Active Energy Σ (T1_T2), exp | kWh | Read | |||
| L1 Phase - active power | kW | Read | |||
| L2 Phase - active power | kW | Read | |||
| L3 Phase - active power | kW | Read | |||
| Active Power Σ | kW | Read | |||
| Reactive Energy 1st phase T1, imp | kvarh | Read | |||
| Reactive Energy 2nd phase T1, imp | kvarh | Read | |||
| Reactive Energy 3rd phase T1, imp | kvarh | Read | |||
| Reactive Energy Σ T1, imp | kvarh | Read | |||
| Reactive Energy 1st phase T2, imp | kvarh | Read | |||
| Reactive Energy 2nd phase T2, imp | kvarh | Read | |||
| Reactive Energy 3rd phase T2, imp | kvarh | Read | |||
| Reactive Energy Σ T2, imp | kvarh | Read | |||
| Reactive Energy 1st phase T1, exp | kvarh | Read | |||
| Reactive Energy 2nd phase T1, exp | kvarh | Read | |||
| Reactive Energy 3rd phase T1, exp | kvarh | Read | |||
| Reactive Energy Σ T1, exp | kvarh | Read | |||
| Reactive Energy 1st phase T2, exp | kvarh | Read | |||
| Reactive Energy 2nd phase T2, exp | kvarh | Read | |||
| Reactive Energy 3rd phase T2, exp | kvarh | Read | |||
| Reactive Energy Σ T2, exp | kvarh | Read | |||
| Reactive Energy Σ T1, capacitive | kvarh | Read | |||
| Reactive Energy Σ T2, capacitive | kvarh | Read | |||
| Reactive Energy Σ T1, inductive | kvarh | Read | |||
| Reactive Energy Σ T2, inductive | kvarh | Read | |||
| L1 phase - reactive power | kvar | Read | |||
| L2 Phase - reactive power | kvar | Read | |||
| L3 phase - reactive power | kvar | Read | |||
| Total reactive power | kvar | Read | |||
| Apparent Energy Σ T1 | kVAh | Read | |||
| Apparent Energy Σ T2 | kVAh | Read | |||
| L2 Phase - apparent power | kVA | Read | |||
| L3 Phase - apparent power | kVA | Read | |||
| Total apparent power | kVA | Read | |||
| L1 Phase Voltage | V | Read | |||
| L2 Phase Voltage | V | Read | |||
| L3 Phase Voltage | V | Read | |||
| L1 Phase Current | A | Read | |||
| L2 Phase Current | A | Read | |||
| L3 Phase Current | A | Read | |||
| L1 phase - power factor | Read | ||||
| L2 phase - power factor | Read | ||||
| L3 phase - power factor | Read | ||||
| Total power factor | Read | ||||
| Frequency | Hz | Read | |||
| Total Active Energy | Read | ||||
| L1 phase - total active energy | Read | ||||
| L2 phase - total active energy | Read | ||||
| L3 phase - total active energy | Read |
Loading registers…
Send your device list
If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Monitor per-phase voltages, currents, and power on a live cloud dashboard for commercial building management.
- Track consumed and exported active energy to verify correct billing at sites with solar PV generation.
- Compare tariff-zone energy usage over time to advise customers on shifting loads to cheaper tariff periods.
- Create an alert when power factor on any phase drops below a defined threshold for more than 5 minutes.
- Generate monthly energy reports for multiple customer sites from a single ModbusCloud account.
- Detect phase imbalance by monitoring per-phase current and active power readings remotely.
Installation
Wire the LE-03MW RS-485 A and B terminals to the corresponding terminals on the ModbusCloud Gateway, observing correct polarity.
Set the Modbus slave address on the LE-03MW using its front panel menu, and note the address for gateway configuration.
Confirm the meter is configured for 19200 baud, odd parity (1 stop bit), which matches the default settings in this template.
Power on the meter and verify that the LCD display shows live measurements before proceeding with communication setup.
In the ModbusCloud portal, add a new device, select the F&F LE-03MW template, and enter the correct Modbus slave address.
Verify that register values appear on the dashboard, checking at least one voltage and one energy reading against the meter display.
Things to watch for
I see no data on the dashboard after connecting the LE-03MW. What should I check?
Verify the RS-485 wiring polarity (A to A, B to B) and confirm the baud rate is set to 19200 with odd parity on both the meter and the gateway. Also ensure the Modbus slave address in the template matches the address configured on the meter.
Some reactive energy values look incorrect or show zero. Why?
The LE-03MW uses uint16 format for certain reactive energy registers (capacitive and inductive totals) and per-phase reactive power, while most other registers use float32. The template handles this, but if you have customized register mappings, double-check the data type for each register.
Can I connect multiple LE-03MW meters on the same RS-485 bus?
Yes. Assign a unique Modbus slave address to each meter using the front panel menu. Then add each meter as a separate device in the ModbusCloud portal, selecting the same LE-03MW template but entering the corresponding slave address.
Does the template support reading tariff-specific energy values?
The template reads total consumed and exported active energy as well as per-tariff energy where the meter exposes these registers via Modbus RTU. Check the register list in the template for the specific tariff registers available.
Want to see how it works?
