Multifunction Relay SMA Solar Technology AG
8 ZusFunktNG-TB-en-25 Technical Description
3 Multifunction Relay
3.1 Possible Applications of the Multifunction Relay
The multifunction relay can be used for various purposes. The applications possibilities for the
multifunction relay depend on the firmware version. If the inverter has the suitable firmware, you can
select one of six operating modes to control the multifunction relay. All firmware versions support the
function as a fault indicator contact. If required, remaining functions can be retrofitted via a firmware
update.
Fault Indicator Contact
You can connect a display device to the multifunction relay, which either reports disturbances or
undisturbed operation of the inverter.
Optimization of Self-Consumption
In order to optimize self-consumption, loads can be switched on or off based on the power availability
of the PV array. The minimum duty cycle is configurable.
Activating Loads via Communication Devices
The multifunction relay allows you to activate and deactivate operational loads via the communication
interface of the inverter.
Power-Dependent Charging of Batteries
The multifunction relay allows you to control the charging of batteries based on the power availability
of the PV array.
Temperature-Dependent Activation of an External Fan
At high ambient temperatures, SMA inverters reduce their power to prevent overheating. If the
installation site does not meet the climate requirements specified in the inverter installation manual,
possible losses can be minimized through the use of additional cooling. For tailored cooling,
an external fan can be controlled via the multifunction relay based on the inverter temperature.
Reporting Start of Grid Feed-In to the Grid Operator
If required by the local grid operator, you can trip a signal to the grid operator via the multifunction
relay once the inverter connects to the utility grid. The multifunction relay simulates the switching status
of the grid relay.
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