SMA SUNNY HOME MANAGER 2.0 - Configuring the Time Period

12 Load Control
SMA Solar Technology AG
Operating manualHM-20-BE-en-1984
Devices such as heating elements or fan heaters have their own automatic switch-off. An integrated thermocouple
ensures that the device automatically switches off upon reaching a configurable temperature threshold. The
SunnyHomeManager registers this disconnection via the switching device connected to the load and also switches off
the switching device for safety reasons. However, the switching device must first be able to detect whether the load is
in operation or in standby mode. You have to enter this detection value. With these settings, you also avoid a
premature disconnection of the load, so that it can also run for longer than the configured time period if necessary.
Heating element with automatic switch-off
When controlled via a switching device, the heating element is switched on and off depending on the availability of
PV energy within the time period defined. 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
switching device even though the time period has expired, until the target temperature is reached and the heating el-
ement has switched to standby mode on its own. The SunnyHomeManager recognizes the standby mode of the
heating element and switches the switching device off.
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, enter the lower threshold for the power consumption of
the load in standby mode (typically 50% of the mean power consumption in operation). When the power
consumption falls below this threshold, the SunnyHomeManager recognizes the switch to standby mode and
disconnects the switching device.
3. If required, in the text field Detection time for disconnection, enter the minimum time period over which the
power consumption must be below the lower threshold for disconnection in order that the SunnyHomeManager
recognizes the switch to standby mode.
12.5 Configuring the Time Period
You can define one or more time periods for a load in which the SunnyHomeManager can or must switch on this
load.
Length of time period
The time period in which the load should be operated must be much longer than the actual operating time so that
SunnyHomeManager has enough flexibility within the time period to identify the time when energy is the
cheapest.
Shorter service life of switching devices through frequent switching of loads
When setting time periods and device operating times, make sure that the load does not have to switch loads on
and off unnecessarily often.