General information regarding the limitation of active power feed-in

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 would be exceeded. If switching on a load means that more power is consumed directly in the household, then 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.

The Sunny Home Manager can be used alone or as part of a storage solution for limitation of active power feed-in.

From firmware version 1.13.xx.R, the Sunny Home Manager enables the limitation of active power feed-in to 0% or 0 W. This "Zero Export" mode can also be used for storage solutions ( > Limitation of Active Power Feed-In to 0% or 0 W).

    Dynamic Limitation of Active Power Feed-In to Avoid Derating Losses
    Avoiding Derating Losses Through Forecast-Based Battery Charging in SMA Storage Solutions