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.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 7, read only
- Brand
- Strong Energy
- Compatible models
- Hybrid Inverter · Alfred 10
- Last updated
Registers (7)
7 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| power_a | W | Read | |||
| power_b | W | Read | |||
| power_c | W | Read | |||
| energy | Read | ||||
| currents_a | Read | ||||
| currents_b | Read | ||||
| currents_c | Read |
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Use cases
- Monitor per-phase grid active power on phases A, B, and C to detect load imbalances across the three-phase supply.
- Track cumulative grid energy to verify monthly import and export totals against utility billing statements.
- Alert on unexpected phase-current spikes on currents_a, currents_b, or currents_c to identify wiring faults early.
- Compare power_a, power_b, and power_c simultaneously to spot persistent single-phase overloads in a residential installation.
- Report historical grid power trends per phase to support annual energy audits or building performance reviews.
Installation
Enable Modbus TCP on the Alfred 10 through the inverter web interface or the Strong Energy app, under the communication or network settings section, and note the assigned IP address and port (default 502).
Connect the Alfred 10 to the same LAN segment as the ModbusCloud Gateway, using a standard Ethernet cable to the inverter's RJ45 network port.
In the ModbusCloud portal, add a new device, select the Strong Energy Alfred 10 (grid) template, enter the inverter's IP address, port 502, and the correct Modbus unit ID.
Verify the connection by checking that live values appear for power_a, power_b, and power_c in the portal dashboard; non-zero readings during daylight or load confirm a successful link.
Things to watch for
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. Keeping the connection alive typically needs a poll every 10 to 30 seconds, while ModbusCloud polls at most once per minute, every 5 minutes by default. If freezing persists, restart the inverter's communication module and re-check the network link for intermittent packet loss.
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