Energy values in kWh appear incorrect or much too high. What should I check?

Make sure you are using template version 1.0.1 or later, which corrected wrong energy consumption kWh values. The energy registers are uint32 and span two registers each, so byte order must match the template configuration.

The gateway cannot communicate with the meter. What are the correct serial settings?

Set the baud rate to 9600, stop bit to 1, and parity to none. Also verify that the meter is in Modbus RTU mode, not DLT645 mode, as both protocols share the same RS485 interface.

Can I connect multiple WS100 meters on one RS485 bus?

Yes. Assign each meter a unique Modbus slave address. Keep the total cable length within RS485 specifications and use proper termination resistors if the bus is long.

Which WS100 models are supported by this template?

The template supports the WS100-1943 and WS100-19L3. Both are single-phase bidirectional meters with RS485 Modbus RTU.

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Free Modbus template: 1~ energy meter BG e-tech WS100-19xx | ModbusCloud

///1~ energy meter BG e-tech WS100-19xx

Modbus RTU

1~ energy meter BG e-tech WS100-19xx

Name: 1~ energy meter BG e-tech WS100-19xx
Brand: B+G E-Tech
SKU: ac1148d3-c932-4104-a268-a19bb8eef5b6

B+G E-Tech

Reads single-phase bidirectional energy metering via Modbus RTU

Overview

Template for the B+G E-Tech WS100-19xx single-phase bidirectional energy meter. It reads voltage, current, active power, frequency, and forward/reverse energy totals over Modbus RTU. Supports direct connection up to 100A with MID accuracy class B.

Key readings

Voltage
Current
Active Power
Frequency
Total Forward Active Energy
Total Reverse Active Energy

Use cases

Monitor real-time voltage, current, and active power of a single-phase circuit on a live cloud dashboard.
Track forward and reverse energy totals to verify PV self-consumption and grid feed-in.
Set up alerts when active power exceeds a defined threshold for load management purposes.
Log energy consumption over time for tenant billing or cost allocation reports.
Compare metered energy data across multiple sites managed from a single ModbusCloud account.

Installation

1Wire the RS485 A and B terminals of the B+G E-Tech WS100 meter to the corresponding RS485 port on the ModbusCloud gateway (MCG or MLP series).
2Set the meter baud rate to 9600, parity to none, and stop bit to 1 to match the template defaults.
3Assign a unique Modbus RTU slave address on the meter and ensure it does not conflict with other devices on the same bus.
4Confirm the meter is configured for Modbus RTU mode rather than DLT645.
5Import the B+G E-Tech WS100-19xx template in the ModbusCloud platform and assign it to the correct gateway and slave address.
6Verify that voltage, current, and energy readings appear correctly on the ModbusCloud dashboard before closing the installation.

Things to watch for

Energy values in kWh appear incorrect or much too high. What should I check?: Make sure you are using template version 1.0.1 or later, which corrected wrong energy consumption kWh values. The energy registers are uint32 and span two registers each, so byte order must match the template configuration.
The gateway cannot communicate with the meter. What are the correct serial settings?: Set the baud rate to 9600, stop bit to 1, and parity to none. Also verify that the meter is in Modbus RTU mode, not DLT645 mode, as both protocols share the same RS485 interface.
Can I connect multiple WS100 meters on one RS485 bus?: Yes. Assign each meter a unique Modbus slave address. Keep the total cable length within RS485 specifications and use proper termination resistors if the bus is long.
Which WS100 models are supported by this template?: The template supports the WS100-1943 and WS100-19L3. Both are single-phase bidirectional meters with RS485 Modbus RTU.

Registers (9)

9 read / 0 write

Name	Address	Function	Type	Unit	Access
Voltage [V]	256	FC03	uint32	V	R
Current [A]	258	FC03	uint32	A	R
Active Power [kW]	260	FC03	uint32	kW	R
Frequency [Hz]	266	FC03	uint16	Hz	R
SN	4096	FC03	uint16		R
Total forward active energy [kWh]	270	FC03	uint32	kWh	R
Mobus ID	4099	FC03	uint16		R
FW Version	4100	FC03	uint16		R
Total reverse active energy [kWh]	280	FC03	uint32	kWh	R

Working with Modbus in your projects?

ModbusCloud is the hardware-plus-software platform that installers use to monitor, visualise and control Modbus devices from one portal. This template is one of hundreds you can use right away.

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Specifications

Protocol: Modbus RTU
Brand: B+G E-Tech
Registers: 9
Compatible models: WS100-1943WS100-19L3
Last updated: 2 April 2026

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