With these packets for new and existing systems, the proven Sunny Island devices have a reputable partner by their side with a new pin stripe look. The new LG Resu energy storage systems that come in the sizes 3.3, 6.5 and 10 kWh (gross) have not only new housing but also more power and a higher energy density. The RESU Plus unit also allows two solar batteries from this series to be combined into one unit. This allows a gross capacity of up to 20 kWh. With a tried and tested easy installation and the complete accessories included, LG Energy Solution & SMA makes for a well-rounded package.