B+GE-TECH WS100 (charge)
The B+GE-TECH WS100 is a compact single-phase DIN rail energy meter used in residential and light-commercial installations to sub-meter individual loads, including EV charge points. This template, configured for the charge role, reads two registers over Modbus RTU: instantaneous active power and cumulative energy. Connecting the WS100 to the ModbusCloud Gateway via an RS485 bus gives installers a live view of charge point consumption and a permanent energy record, enabling cost allocation and load monitoring without additional hardware.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 2, read only
- Brand
- B+GE-TECH
- Last updated
Registers (2)
2 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| power | W | Read | |||
| energy | Read |
Loading registers…
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Use cases
- Monitor real-time power draw at a single-phase EV charge point to verify it stays within contracted limits.
- Track cumulative energy delivered per charge session to support tenant cost allocation or reimbursement reporting.
- Alert on sustained zero-power readings during expected charging periods to detect a stuck or faulted meter.
- Compare charge point energy consumption month-over-month to identify usage trends across a shared parking facility.
- Verify that active power drops to zero after a vehicle disconnects, confirming the charge point has stopped drawing current.
Installation
Mount the B+GE-TECH WS100 on the DIN rail in the distribution board and connect the load-side AC conductors through the meter terminals according to the wiring diagram in the device manual.
Wire the RS485 bus: connect the A and B terminals of the WS100 to the corresponding A and B terminals on the ModbusCloud Gateway using a twisted-pair cable, and fit a 120-ohm termination resistor at each end of the bus if the WS100 is the last device on the segment.
In the ModbusCloud portal, add your Gateway, import the B+GE-TECH WS100 (charge) template, and assign the correct Modbus slave unit ID (default is 1; adjust if the meter's DIP switches or configuration software have been set to a different address).
Spot-check the connection by reading the power register (address 260) in the portal's live register view while a known load is energized on the metered circuit, and confirm the returned value is plausible before saving the configuration.
Things to watch for
Why does the power register always return zero even with a load connected?
Confirm the load conductors pass through the meter in the correct direction and are fully seated in the terminals. Also verify the Modbus slave ID in the portal matches the meter's configured address. At default settings the WS100 uses slave ID 1; a mismatch returns no data, which the portal may display as zero.
The gateway connects but power and energy values are garbage or very large numbers.
The WS100 returns int32 values split across two consecutive 16-bit registers in big-endian byte order. If your Modbus master or a bridging device is configured for little-endian or word-swapped order, the 32-bit assembly will be wrong. Set the word order to big-endian (high word first) in the Gateway or bridge configuration.
Energy reading is stuck and never increments, but power looks correct.
The energy register at address 270 accumulates as a signed int32. If the meter was recently reset or is brand new, the value starts at zero and increments slowly at low power levels. Check the polling interval in the portal and confirm the register type is set to int32 spanning two registers, not a single 16-bit read.
The RS485 bus works fine with one meter but fails when I add a second WS100.
Every device on the same RS485 bus must have a unique slave ID. Use the WS100 configuration software or the front-panel menu to assign distinct addresses before connecting both meters. Also ensure only the two physical ends of the bus have termination resistors fitted; extra resistors mid-bus cause signal reflections that corrupt Modbus frames.
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