Writes to batterymode_a return an illegal address error. What is wrong?

Not all SolarEdge inverter models expose the StorEdge control registers over Modbus. Battery control registers are only available on inverter hardware that has battery support enabled. Confirm your model is a StorEdge or Hybrid variant and that the battery is commissioned in SetApp. If the error persists, the firmware may need updating.

I set batterymode_a to 4 but the inverter reverts to a previous mode. Why?

SolarEdge implements a Remote Control Command Timeout. If no new command is sent within the timeout window (default 3600 seconds), the inverter falls back to the Storage Default Mode. Send periodic keep-alive writes to batterymode_a, or set the timeout to a shorter value so the fallback is predictable.

The Gateway connects but no acknowledgement appears after writing batterymode_b. What now?

Modbus TCP on SolarEdge supports only a single concurrent connection and session. If another client (such as a home automation system or a monitoring app) is holding the TCP socket, the ModbusCloud Gateway write will fail. Close all other Modbus connections to the inverter before attempting writes.

Is it safe to freely write any wattage value to the remote charge/discharge register?

Use caution: writing an excessively high charge or discharge power to batterymode_b may trigger the inverter's internal protection limits or conflict with grid-operator export restrictions configured on the site. Always confirm the commanded value is within the rated battery and inverter limits, and test with conservative values first. Incorrect setpoints may cause unexpected behaviour and could affect your warranty.

Free Modbus template: SolarEdge Hybrid Inverter (battery)

The SolarEdge Hybrid Inverter is a StorEdge-compatible PV inverter with integrated DC-coupled battery management, used in residential and small commercial solar-plus-storage installations. This Modbus TCP template targets the inverter's StorEdge control block, providing two write registers: batterymode_a selects the storage operating mode (such as self-consumption or remote control) and batterymode_b sets the remote charge or discharge power command in watts. Together, these registers allow external control of battery dispatch from the ModbusCloud portal, enabling tariff-aware charging and export strategies.

Name	Address	Function	Type	Unit	Access
batterymode_a Storage control mode selector: Disabled, Self-Consumption, Time of Use, or Remote.	57357	FC16	uint16		W
batterymode_b Remote charge/discharge power command in watts, float32.	57360	FC16	float32	W	W