SMA SUNNY HOME MANAGER - Manual (Page 73)

SMA Solar Technology AG 9 Load Control
User Manual HoMan_Portal-BA-en-17 73
9.3.14 Setting Automatic Switch-Off
If the load has its own automatic switch-off, you must provide additional details so that the
SMA radio-controlled socket can detect whether the load is in operation or in standby mode.
Requirement:
☐ The load must not be program-controlled.
Procedure:
1. In the field Load has internal automatic switch-off, activate the checkbox Yes.
2. If required, in the text field Threshold for disconnection, adjust the predefined threshold for
power consumption in standby mode (for information on power consumption in standby mode,
see the load manual). Tip: Typically, the threshold is approx. 50% of the average power
consumption during operation.
3. If required, in the text field Detection time for disconnection, adjust the preset time period for
which the threshold of the power consumption must at least be exceeded in order to detect
standby mode.
Example: Heating element with automatic switch-off
A heating element heats the water in a hot water tank. An integrated thermostat ensures that the
heating element is switched off automatically above a specific defined target temperature.
The heating element is controlled via an SMA radio-controlled socket.
Within the time period defined for the heating element (see Section 9.3.16, page 74), it is switched
on and off depending on the availability of PV energy. If the automatic switch-off is activated and
the water has not yet reached the set temperature at the end of the time period, the heating element
can continue to draw electric current from the SMA radio-controlled socket even though the time
period has expired, until the target temperature is reached and the heating element has switched to
standby mode on its own. The Sunny Home Manager recognizes the standby mode of the heating
element and switches the SMA radio-controlled socket off.