Upgraded and improved from SMA, the Sunny Island 4548-US and 6048-US inverters are derived from the proven off-grid technology in the Sunny Island 5048-US with 20 percent increase in power. A whopping efficiency of 96 percent ensures peak production & efficent use of available power. The expandable, modular design allows for flexible system planning. With the new SMA Multicluster, up to 12 Sunny Islands can be integrated into off-grid power systems up 100 kW in size.