Some registers return zero or no data. What should I check?

Update the Shelly Pro 3EM firmware to version 1.0 or later. Earlier firmware versions were missing certain register values. After the update, power-cycle the device and re-read the registers.

What data encoding do the registers use?

All measurement registers use float32 encoding, meaning each value spans two consecutive 16-bit Modbus registers. The template already accounts for this, so no manual byte-order configuration is needed.

Do I need RS-485 wiring between the gateway and the meter?

No. The Shelly Pro 3EM uses Modbus TCP over Ethernet or Wi-Fi. The ModbusCloud gateway and the meter only need to be on the same IP network.

Can I use this template with other Shelly energy meters?

The template is based on the Shelly EM and EMData register specification and has been tested on the Shelly Pro 3EM. Other Shelly meters sharing the same register map may work, but verify against the official Shelly documentation before deploying.

Free Modbus template: Shelly Pro 3EM

Name: Shelly Pro 3EM
Brand: Shelly
SKU: b098eddb-6a0f-4b09-bb4f-9c73cc2146a0

Modbus TCP template for the Shelly Pro 3EM three-phase energy meter. It reads voltage, current, active power, apparent power, power factor, and accumulated energy across all three phases and neutral. No writable control registers are included.

Registers (61)

61 read / 0 write

Name	Address	Function	Type	Unit	Access
Phase A meter error	1002	FC04	uint16		R
Phase B meter error	1003	FC04	uint16		R
Phase C meter error	1004	FC04	uint16		R
Neutral meter error	1005	FC04	uint16		R
Phase sequence error	1006	FC04	uint16		R
Neutral current	1007	FC04	float32	A	R
Neutral current mismatch	1009	FC04	uint16		R
Neutral overcurrent error	1010	FC04	uint16		R
Total current	1011	FC04	float32	A	R
Total active power	1013	FC04	float32	kW	R
Total apparent power	1015	FC04	float32	VA	R
Phase A voltage	1020	FC04	float32	V	R
Phase A current	1022	FC04	float32	A	R
Phase A active power	1024	FC04	float32	kW	R
Phase A apparent power	1026	FC04	float32	VA	R
Phase A power factor	1028	FC04	float32		R
Phase A overpower error	1030	FC04	uint16		R
Phase A overvoltage error	1031	FC04	uint16		R
Phase A overcurrent error	1032	FC04	uint16		R
Phase B voltage	1040	FC04	float32	V	R
Phase B current	1042	FC04	float32	A	R
Phase B active power	1044	FC04	float32	kW	R
Phase B apparent power	1046	FC04	float32	VA	R
Phase B power factor	1048	FC04	float32		R
Phase B overpower error	1050	FC04	uint16		R
Phase B overvoltage error	1051	FC04	uint16		R
Phase B overcurrent error	1052	FC04	uint16		R
Phase C voltage	1060	FC04	float32	V	R
Phase C current	1062	FC04	float32	A	R
Phase C active power	1064	FC04	float32	kW	R
Phase C apparent power	1066	FC04	float32	VA	R
Phase C power factor	1068	FC04	float32		R
Phase C overpower error	1070	FC04	uint16		R
Phase C overvoltage error	1071	FC04	uint16		R
Phase C overcurrent error	1072	FC04	uint16		R
Total active energy accumulated for all phases - perpetual count	1162	FC04	float32	kWh	R
Total active returned energy accumulated for all phases - perpetual count	1164	FC04	float32	kWh	R
Phase A total active energy	1170	FC04	float32	kWh	R
Phase A fundamental active energy	1172	FC04	float32	kWh	R
Phase A total active returned energy	1174	FC04	float32	kWh	R
Phase A fundamental active returned energy	1176	FC04	float32	kWh	R
Phase A lagging reactive energy	1178	FC04	float32	VARh	R
Phase A leading reactive energy	1180	FC04	float32	VARh	R
Phase A total active energy - perpetual count	1182	FC04	float32	kWh	R
Phase A total active returned energy - perpetual count	1184	FC04	float32	kWh	R
Phase B total active energy	1190	FC04	float32	kWh	R
Phase B fundamental active energy	1192	FC04	float32	kWh	R
Phase B total active returned energy	1194	FC04	float32	kWh	R
Phase B fundamental active returned energy	1196	FC04	float32	kWh	R
Phase B lagging reactive energy	1198	FC04	float32	VARh	R
Phase B leading reactive energy	1200	FC04	float32	VARh	R
Phase B total active energy - perpetual count	1202	FC04	float32	kWh	R
Phase B total active returned energy - perpetual count	1204	FC04	float32	kWh	R
Phase C total active energy	1210	FC04	float32	kWh	R
Phase C fundamental active energy	1212	FC04	float32	kWh	R
Phase C total active returned energy	1214	FC04	float32	kWh	R
Phase C fundamental active returned energy	1216	FC04	float32	kWh	R
Phase C lagging reactive energy	1218	FC04	float32	VARh	R
Phase C leading reactive energy	1220	FC04	float32	VARh	R
Phase C total active energy - perpetual count	1222	FC04	float32	kWh	R
Phase C total active returned energy - perpetual count	1224	FC04	float32	kWh	R

Shelly Pro 3EM

Overview

Key readings

Use cases

Installation

Things to watch for

Registers (61)

Working with Modbus in your projects?

More TCP templates

Domekt R 400 V

Fronius - Modbus TCP

NIBE Nibe S-Series (SG Ready)

SunSpec Model 709 — DER Trip LF

Victron Meter AcOut

FoxESS Avocado (grid)