All registers return zero or show no data after setup.

Confirm the VARTA pulse is reachable on your network by pinging its IP address. Check that port 502 is not blocked by a firewall on the device or the local router. Also verify the unit ID is set to 255 in the ModbusCloud template configuration, as the VARTA Modbus documentation recommends this value.

The power register shows unexpected values or alternates between positive and negative.

The power register at address 1066 is signed int16: positive values indicate the battery is charging, negative values indicate discharge. If the sign appears inverted compared to your expectation, check whether your energy management convention differs. No scaling factor applies; the value is in watts, one to one.

Writing to the batterymode register fails or has no effect.

Community reports indicate the VARTA pulse may reject writes to register 1074 when a simultaneous Modbus poll is actively reading holding registers. Pause or stagger your polling cycle before sending the write command. Also note that register 1074 is not listed in all versions of the official VARTA Modbus documentation; its behaviour may vary by firmware version.

Should I use the batterymode write register during normal operation?

Use the batterymode setpoint with caution. Sending incorrect values can override the system's built-in energy management logic and may affect battery protection routines. Test write commands in a controlled window, confirm the expected response via the power and soc registers, and consult your VARTA installation documentation before automating setpoint changes in production.

Free Modbus template: VARTA pulse (battery)

The VARTA pulse is an AC-coupled residential battery storage system, available in the pulse, pulse neo, element, and element backup variants, designed to store solar surplus and reduce grid dependency. This ModbusCloud template connects via Modbus TCP to read battery power flow and state of charge, and to write the battery mode setpoint. With these three registers you can track real-time charge and discharge power, monitor the state of charge trend over time, and send operating mode commands directly from your portal. Installers gain live visibility into VARTA pulse system behaviour without relying on the proprietary VARTA portal.

Name	Address	Function	Type	Unit	Access
power AC battery power in watts, positive when charging, negative when discharging.	1066	FC03	int16	W	R
soc Total battery state of charge, 0 to 100 percent.	1068	FC03	int16	%	R
batterymode Battery operating mode setpoint; controls charge or discharge behaviour.	1074	FC16	int16		W

VARTA pulse (battery)

Overview

Use cases

Installation

Things to watch for

Registers (3)

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