SMA SUNNY HOME MANAGER 2.0 - Heat Pumps with SG-Ready Interface; Objective and Background Information

20 Application Examples
SMA Solar Technology AG
Operating manual 137HM-20-BE-en-19
9. In the field Required state of charge (SOC) for forecast-based charging, change the preset value from 0% if
applicable (e.g. to 60%).
The set value indicates the percentage of the battery charge that must be reached before the
SunnyHomeManager activates the forecast-based battery charging function, i.e. up to this value the function
forecast-based charging is deactivated.
10. In the field Charging of battery prior to optional loads place a checkmark: Active
This way you ensure that the battery is first charged before the SunnyHomeManager considers other loads such
as a heating element, for example.
20.2 Heat Pumps with SG-Ready Interface
20.2.1 Objective and Background Information
The goal of integrating heat pumps into energy management
In combination with a PV system and control via the Sunny Home Manager, heat pumps can make a major
contribution to increasing self-consumption, as they are well suited to "shifting" loads.
Heat pumps as so-called load-variable loads can be
• switched on in a targeted manner in order to store solar power, which is not to be fed into the local grid, in the
form of thermal energy and use it to cover heating requirements.
• switched off in a targeted manner in order to reduce consumption peaks or avoid them altogether.
Heat Pumps with SG-Ready Interface
The SG Ready label, which was introduced in 2012 by the Bundesverband für Wärmepumpen (BWP) e.V. (German
Heat Pump Association), certifies heat pumps that can communicate with the utility grid due to an interface-compatible
system component - the Smart Grid Ready interface.
This SG Ready interface enables high grid efficiency and efficient load control.
• Grid operators can access this interface.
In the event of power peaks or shortages, the grid operator can issue "instructions" to SG Ready heat pumps: For
example, he can temporarily shut them down or ramp up their operation.
• Regardless of the current demand, SG Ready heat pumps can
– convert surplus electricity into thermal energy.
– temporarily store energy in a hot water or buffer storage tank, for example, in order to temporarily relieve the
utility grid on the one hand, and on the other hand to be able to retrieve this temporarily stored energy for
own use as needed.
Controlling the SG Ready heat pump via the SunnyHomeManager
As part of its load planning, the SunnyHomeManager determines one or more suitable switch-on times and the
suitable switch-on duration for the load based on the PV generation forecast and according to the configured load
properties and time windows. It passes this data on to the heat pump as recommendations.
The heat pump receives the signal that it can use solar power via the SG Ready control input and starts producing hot
water by increasing the set temperature of the buffer tank.
The activation of the control input, the presetting of the temperature increase and the minimum running time must be set
via the control on the heat pump (see the manufacturer's manual).
The SunnyHomeManager coordinates the following steps:
• If there is enough solar power, loads are supplied with solar power according to their configuration, e.g. home
appliances or a heat pump are switched on.