SMA SUNNY HOME MANAGER - Manual (Page 17)

SMA Solar Technology AG 3 Product Description
User Manual HoMan_Portal-BA-en-17 17
Limitation of active power feed-in
Local regulations, for example, the Renewable Energy Sources Act (EEG) in Germany, can call for
permanent limitation of active power feed-in for your PV system, that is, a limitation of the active power
fed into the utility grid to a fixed amount or a percentage share of the installed nominal PV system
power. If required, ask your grid operator whether a permanent limitation of the active power feed-in
is necessary and whether you are allowed to use the Sunny Home Manager for this purpose (see the
Manufacturer's Declaration "Feed-In Management In Accordance with the Renewable Energy
Sources Act (EEG) 2012 with SMA Sunny Home Manager (SHM) from SMA" available at
www.SMA-Solar.com).
Using an SMA Energy Meter or a suitable feed-in meter, the Sunny Home Manager monitors the
active power that is fed into the utility grid. If the active power feed-in exceeds the prescribed limit, the
Sunny Home Manager limits the PV generation of the inverters accordingly.
The Sunny Home Manager avoids derating losses due to limitation of PV power generation by taking
the current self-consumption of the household into account. Sunny Home Manager helps to use excess
PV power in households directly and increases the self-consumption quota as a result. For PV systems
with SMA battery inverters, the Sunny Home Manager preferentially uses the derated active power
to charge the battery.
Implementation of Grid Management Services via Ethernet-Based
Communication
As part of grid management services, it may be necessary to implement grid operator specifications
for active power limitation and for reactive power feed-in (e.g. the active power feed-in of your PV
system will be reduced in the event of grid overloads).
The Sunny Home Manager can implement specifications for grid management services, which the
grid operator sends via Ethernet-based communication to the Sunny Home Manager. If applicable,
ask your grid operator whether your PV system is required to implement grid management services.
Example: Limitation of the active power feed-in to 70% of the nominal PV system power
Due to high levels of solar irradiation, the system can currently produce 90% of the nominal
PV system power.
• At this time, 20% of the nominal PV system power is being consumed by loads in the
household. The remaining 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.