SMA HM-20 - Connection Options of the SG Ready Heat Pump

20 Application Examples
SMA Solar Technology AG
Operating manualHM-20-BE-en-19138
• If an electricity storage system is available, the solar power produced in addition and not currently required for
the operation of loads is stored. The storage device can be a battery, a charger for an electric vehicle or a heat
pump.
• Only when no more electricity is needed for self-consumption or storage for self-consumption is this "surplus"
electricity fed into the utility grid.
20.2.2 Connection options of the SG Ready heat pump
For a heat pump with Smart Grid Ready (SG Ready) control input, a suitable relay with potential-free switching output
is required. Only the SG Ready control input is controlled by the SunnyHomeManager; the heat pump itself is
permanently connected to the power supply.
In the following, options for connecting a heat pump with SG Ready interface are presented:
• Connection via compatible radio-controlled socket and separate relay
• Connection via compatible relay (direct connection)
Only selected devices support the connection to the SunnyHomeManager (see technical information "SMA
SMART HOME - Compatibility List for the SunnyHomeManager 2.0").
Connection via compatible radio-controlled socket and separate relay
The radio-controlled socket can switch a relay with potential-free output, which can be controlled on the input side via
230V
AC
. The actual load, in this case the heat pump, is put into operation by the output of the relay. If 230 V
AC
is
applied to the relay via the radio-controlled socket, the SG Ready control input is active and the heat pump starts or is
set to the programmed operating mode, e.g. to preferentially consume excess PV energy.
VAC
Potential-free
contact
Figure 21: Connection of a heat pump via compatible radio-controlled socket and separate relay