Maximum AC Power of the PV Inverters
The AC power that the PV inverters are permitted to feed into the battery-backup system is limited mainly by the rated power of the battery inverter.
Type of battery-backup system | Device type | Battery inverter1) | PV inverter2) |
|---|---|---|---|
Single-phase system with Sunny Island | SI4.4M-12 / SI4.4M-13 (Sunny Island 4.4M) | 3.3 kW | 4.6 kW |
SI6.0H-12 / SI6.0H-13 (Sunny Island 6.0H) | 4.6 kW | 9.2 kW | |
SI8.0H-12 / SI8.0H-13 (Sunny Island 8.0H) | 6.0 kW | 12 kW | |
Three-phase system with one Sunny Island | SI4.4M-12 / SI4.4M-13 (Sunny Island 4.4M) | 9.9 kW | 13.8 kW |
SI6.0H-12 / SI6.0H-13 (Sunny Island 6.0H) | 13.8 kW | 27.6 kW | |
SI8.0H-12 / SI8.0H-13 (Sunny Island 8.0H) | 18.0 kW | 36 kW |
1) Rated power of the battery inverter
2) Maximum AC power of the PV inverters
When estimating the maximum AC power of the PV inverters, the following factors can also be considered:
The yield of the PV power is influenced by the solar irradiation on site. As a result, the AC power output of the the PV inverters can be reduced.
Local regulations can call for permanent limitation of active power feed-in to a fixed amount or a percentage share of the installed nominal PV system power. This can also lower the AC power output of the PV inverters.
If additional inverters are connected to the Sunny Island on the AC side, then their power is not restricted. Both single-phase and three-phase inverters can be connected. However, the additional inverters connected on the AC side cannot provide a feed in the event of a grid failure.