Set up self-consumption control for heat pumps (SG Ready)

Using the SG Ready function is a simple and cost-effective solution to increase PV self-consumption by using a heat pump. The inverter allows a heat pump with SG Ready compatibility to be controlled.

The SG Ready specification's operating statuses 2 (normal operation) and 3 (start-up recommendation) are supported.

The heat pump/heating element is switched on when the set conditions are met. The SG Ready mode can be configured for this purpose via the inverter's Webserver menu.

In this mode, the switching signal is used to give the heat pump a start-up recommendation (in accordance with operational status 3 of the SG Ready specification). In this operational status, the heat pump runs within the controller in boosted operation for heating and domestic hot water preparation.

The configured switch-on limit should therefore at least correspond to the power consumption required for boosted operation.

For further information on connection and power consumption, please refer to the heat pump's operating manual.

Example setting: Webserver

Switched output no. 1 (OUT1) is used. This should switch based on grid excess power. According to the manufacturer, the heat pump's boosted operation (operating mode 3) requires 1700 W.

The activation limit is set to the 1700 W required for boosted operation.

50 W is entered under deactivation limit .

As soon as the 1700 W power is exceeded for the set period, the output becomes active for the selected duration, which is at least 10 minutes. The grid excess drops below the deactivation limit to approx. 0 W as soon as the heat pump switches to enhanced operation.

After the minimum duty cycle has elapsed, the switched output becomes inactive again.

You can set the maximum number of times the behaviour described above may be repeated per day in the Frequency of activation field.

INFO

If the output is to be switched based on PV power, we recommend adding the base load of the house consumption (approx. 150 to 500 W) to the activation and deactivation limit.

SG Ready settings

Parameter	Explanation
Switch output based on	Grid excess or PV power.
Activation limit [W]	The switched output is activated as of this value.
Deactivation limit [W]	Below this value, the switched output is deactivated.
Limit must be exceeded for [min]	The activation/deactivation limit must be exceeded by the number of minutes specified before the switched output is activated/deactivated. This prevents devices from being repeatedly switched on/off if, for example, no PV energy is available for a short time. 10 minutes is reasonable here.
Minimum duty cycle [min]	The switched output remains active at least until the set time has been reached. This prevents devices from being repeatedly switched on/off. The SG Ready specification states that the signal must be active for at least 10 minutes. Therefore, it is not possible to set a lower value.
Frequency of activation [number/day]	Indicates the maximum number of activations per day. For heat pumps, it is recommended to enter a maximum of 10 activations per day.