All registers return zero or timeout. What should I check?

Confirm that Modbus TCP is explicitly enabled in the Alfred 10 communication settings, as it is often disabled by default. Verify the inverter's IP address is reachable from the ModbusCloud Gateway by pinging it from the same subnet. Also check that no firewall or VLAN is blocking port 502.

Power values seem 10x or 100x too high or too low. Why?

The alfred 10 grid registers store active power as int32 values, but the scaling factor depends on firmware version. If readings appear off by a fixed multiplier, check the manufacturer documentation or release notes for your firmware version. Do not apply an additional software scaling factor unless confirmed by the official register map.

Phase currents read negative values. Is that correct?

Yes. The currents_a, currents_b, and currents_c registers are signed int32 types, so current flowing in the import direction may be represented as a negative value depending on the inverter's sign convention. Cross-check the sign against a clamp meter to confirm direction before setting up alerts.

The gateway connects but values freeze and stop updating. What now?

The Alfred 10 may drop idle TCP connections after a timeout period. Ensure the ModbusCloud Gateway poll interval is short enough to keep the connection alive, typically 10 to 30 seconds. If freezing persists, restart the inverter's communication module and re-check the network link for intermittent packet loss.

Free Modbus template: Strong Energy Alfred 10 (grid)

The Strong Energy Alfred 10 is a modular all-in-one hybrid inverter and battery storage system rated at 10 kW, designed for residential and light commercial PV installations. This Modbus TCP template targets the grid-connection meter function embedded in the Alfred 10, reading per-phase active power on phases A, B, and C, cumulative grid energy, and per-phase AC currents. All seven registers are read-only and polled via function code 3 over a standard TCP connection to the inverter. Use these values in the ModbusCloud portal to track grid import and export in real time across all three phases.

Name	Address	Function	Type	Unit	Access
power_a Active power on phase A, signed, watts.	•••	•••	•••	W	R
power_b Active power on phase B, signed, watts.	•••	•••	•••	W	R
power_c Active power on phase C, signed, watts.	•••	•••	•••	W	R
energy Cumulative grid energy, unsigned 32-bit counter.	•••	•••	•••		R
currents_a AC current on phase A, signed, milliamps or scaled amps.	•••	•••	•••		R
currents_b AC current on phase B, signed, milliamps or scaled amps.	•••	•••	•••		R
currents_c AC current on phase C, signed, milliamps or scaled amps.	•••	•••	•••		R

Strong Energy Alfred 10 (grid)

Overview

Use cases

Installation

Things to watch for

Registers (7)

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Question about your setup?

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Strong Energy Alfred 10 (pv)

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