Alpha ESS Smile5 Extension Accessory Pack for 2.9kWh:
A Single Extension Pack System.
Extension pack: used to extend your Alpha ESS Smile5 system with M4856-P 2.9kWh battery.
One Extension Pack per System is required, regardless of how many additional batteries are used.
Not suitable for Alpha SmileB3 with M4856-P 2.9kWh battery. For the B3 version, use part number ALPH-BAT-EXT