
Modbus TCP
E3/DC e3dc (grid)
E3/DC
Overview
The E3/DC e3dc (grid) is a single-register Modbus TCP meter template targeting the grid connection point of E3/DC home power stations (S10 product family). It reads the instantaneous grid power from holding register 40073 as a signed 32-bit integer: positive values indicate power drawn from the grid, negative values indicate export to the grid. The ModbusCloud Gateway connects to the E3/DC unit over the local Ethernet network on port 502. This template gives installers and energy managers a live view of grid exchange in the ModbusCloud portal without any additional hardware.
Use cases
- Monitor real-time grid import and export to verify that the E3/DC system is operating within expected power limits.
- Alert on sustained grid import above a threshold to detect when battery storage is no longer covering household load.
- Track grid export values over time to confirm that feed-in limits imposed by the grid operator are not exceeded.
- Compare grid power readings against expected PV production to identify unexpected consumption patterns or metering faults.





