Maximum Power Consumption of the Loads with Sunny Island
The maximum power consumption of the loads during the day and the type of battery-backup system determine the device type and the number of battery inverters. In a single-phase battery backup system with Sunny Island, for instance, the maximum power consumption of the loads must be less than the maximum power of the Sunny Island for a duration of 30 min at 25°C.
Type of battery-backup system | Maximum power1) | Device type | Number of inverters |
|---|---|---|---|
Single-phase | 4.4 kW | SI4.4M-12 / SI4.4M-13 (Sunny Island 4.4M) | 1 |
6 kW | SI6.0H-12 / SI6.0H-13 (Sunny Island 6.0H) | ||
8 kW | SI8.0H-12 / SI8.0H-13 (Sunny Island 8.0H) | ||
Three-phase | 13.2 kW | SI4.4M-12 / SI4.4M-13 (Sunny Island 4.4M) | 3 |
18 kW | SI6.0H-12 / SI6.0H-13 (Sunny Island 6.0H) | ||
24 kW | SI8.0H-12 / SI8.0H-13 (Sunny Island 8.0H) |
1) Maximum power of the battery inverter inverter for 30 minutes at 25°C and 230 V
Short-term overload during grid failure
Short-term overload peaks of the loads can be compensated by the battery inverter within its technical power limits (see operating manual of the inverter at www.SMA-Solar.com). However, the DC cabling from the battery inverter to the battery must be designed to withstand this overload operation (see Technical Information "Approved Batteries and Information on Batteries in Sunny Island Systems" at www.SMA-Solar.com).