Free Modbus template: Strong Energy Alfred 10 (pv) | ModbusCloud
Modbus RTU
Strong Energy Alfred 10 (pv)
Strong Energy
Overview
The Strong Energy Alfred 10 is a modular all-in-one hybrid inverter and battery storage system for residential and commercial PV installations. The internal 10 kW inverter pairs with a lithium iron phosphate battery of up to 24 kWh capacity. This Modbus RTU template reads the PV string side of the Alfred 10, covering instantaneous generation power and cumulative energy yield. Connecting these two registers to the ModbusCloud Gateway gives installers and asset managers a continuous, timestamped record of PV output without relying on a proprietary cloud app.
Use cases
Monitor instantaneous PV generation power to detect soiling or shading events at the string level.
Track cumulative energy yield daily to verify performance against the design estimate.
Alert on sustained zero power readings during daylight hours to identify inverter faults early.
Compare weekly energy totals across multiple Alfred 10 sites in the ModbusCloud multi-site overview.
Report monthly PV yield figures to building owners for energy billing or feed-in tariff reconciliation.
Installation
1Enable Modbus RTU communication on the Alfred 10 via the Strong Energy app or the local web interface, and note the configured slave address (unit ID) and baud rate under the communication or Modbus section.
2Connect the ModbusCloud Gateway RS485 terminals to the Alfred 10 RS485 port, wiring A to A and B to B, and fit a 120-ohm termination resistor at each end of the bus if the Gateway is the last device on the line.
3In your ModbusCloud portal, add a new Gateway, import the Strong Energy Alfred 10 (pv) template, and assign the unit ID that matches the slave address configured on the inverter.
4Check the live register view in the portal: address 4168 should show a non-zero power value during daylight and address 4129 should show an increasing energy count; if both read zero, verify the baud rate and unit ID settings.
Things to watch for
01
Why does register 4168 show zero power even in full sun?
Confirm that Modbus RTU is enabled on the Alfred 10 and that the baud rate in the portal matches the inverter setting. A mismatch in baud rate causes silent no-response errors. Also verify the RS485 A and B wires are not swapped, as polarity inversion produces no valid response.
02
Energy at address 4129 never increments. What is wrong?
The energy register is a uint32 and rolls over at 4,294,967,295. On a new or recently reset inverter the value may read 0 correctly. If power (4168) is incrementing but energy stays flat, check whether the inverter firmware requires a minimum operating time before the energy counter activates, and confirm no communication CRC errors are logged on the Gateway.
03
The Gateway connects but all register reads time out. What should I check?
Verify the unit ID in the portal exactly matches the slave address configured on the Alfred 10. An incorrect unit ID causes the inverter to ignore all requests silently. Also ensure no other Modbus master is polling the same RS485 bus simultaneously, as bus contention will cause timeouts.
04
Values look plausible but jump erratically between reads. What causes this?
Erratic readings on an RS485 line usually indicate missing bus termination or a cable run that is too long without shielding. Fit 120-ohm resistors at each physical end of the RS485 bus, use twisted-pair cable, and keep the total bus length within the RS485 specification. If the issue persists, increase the inter-frame gap in the Gateway polling settings.
Cumulative PV energy yield, unsigned 32-bit integer.
4129
FC03
uint32
Wh
R
Working with Modbus in your projects?
ModbusCloud is the hardware-plus-software platform that installers use to monitor, visualise and control Modbus devices from one portal. This template is one of hundreds you can use right away.
