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.

Free Modbus template: 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.

Name	Address	Function	Type	Unit	Access
power Instantaneous active power at the charge point, signed watts.	260	FC03	int32	W	R
energy Cumulative energy delivered at the charge point, integer value.	270	FC03	int32		R