SMA HM-20 User Manual

10 Configuration of the SunnyHomeManager system
SMA Solar Technology AG
Operating manualHM-20-BE-en-1944
In addition to the dynamic limitation of PV generation, the SunnyHomeManager can also use intelligent energy
management to ensure that loads in the household are switched on at precisely those times when so much PV energy is
available that the feed-in limit will be reached. If switching on a load means that more power is consumed directly in
the household, the PV generation must not be reduced by as much or must not be reduced at all.
Limitation of the active power feed-in to 70% of the nominal PV system power
Due to high levels of solar irradiation, the system (system size: 10kWp / feed-in limit: 7kW) can currently produce
90% of the nominal PV system power.
• 20% of the nominal PV system power is currently being consumed by loads in the household. The remaining
amount of 70% of the nominal PV system power is being fed into the utility grid.
No limitation of PV generation is required.
• A load is switched off and only10% of the nominal PV system power is consumed in the household. As a
result,80% of the nominal system power is available for feed-in to the utility grid – more than allowed.
The SunnyHomeManager reduces PV generation from the theoretically possible 90% of nominal PV system
power to80%. 70% of the nominal PV system power continues to be fed into the utility grid.
A Limiting of the active power feed-in can be entered as follows:
• Limitation to a fixed value of the nominal system power in kW (setting range: 0kW to 0.99xnominal system
powerkW)
If there is also a limit due to external setpoints in addition to this setting, the limit is set to the smallest value.
• Limitation to a percentage of the nominal system power (setting range: 0% to 99%)
If there is also a limit due to external setpoints in addition to this setting, the limit is set to the smallest value.
• Zero export – blocks grid feed-in into the utility grid (setting: 0% or 0.000kW of the nominal system power). Due
to control cycle times, an inevitable remaining quantity of energy might nevertheless be fed into the utility grid.
• External setpoints - the active power feed-in is only limited when this is required by external setpoints. Such
limitations can come from various external sources, such as grid management services via Ethernet-based
communication or a connected Moxa device.
This option can be activated in addition to a previously entered limiting value (in % or kW of the system power).
As a general rule, if there are several external specifications, the smallest value is used.
If a battery or hybrid inverter is part of your system, after a defined limit of the nominal system power (< 10 % of or the
corresponding kW value of the system power) is set, you can include the battery or hybrid inverter in the energy
management and use the surplus energy to charge the battery-storage system.
You can use a function test to check the limitation of the active power feed-in:
• In the Limitation of active power feed-in section, click on the option button max.xxkW and enter the value
0. Thus, the SunnyHomeManager immediately limits the active power when the inverters starts feeding into the
utility grid.
Supported inverters for the limitation of the active power feed-in to 0%
The limitation of the active power feed-in to 0% is only supported by inverters that support the fallback function. In
the event of a communication failure between the SunnyHomeManager and the inverter, the inverter reverts to
an output power of 0watts. For more information see the inverter manual at www.SMA-Solar.com.
Procedure:
1. In the area Limiting of the active power feed-in, select the applicable option:
2. If limitation of active power feed-in is not required for your system, select no limiting of the active power feed-
in (default setting).

SMA HM-20 Specifications

General

Brand	SMA
Model	HM-20
Category	Measuring Instruments
Language	English