Long warranty period: 3-5 years ·Iron phosphate-lithium power battery· Support connected in parallel mode for expansion ·Higher energy density, smaller volumn for household. ·Photovoltaic system: This battery pack is designed for household photovoltaic systems. Battery management system (BMS) : The battery packs built-in BMS monitors its operation and prevents the battery from operating outside design limitations. ·Expandability: This battery pack can be easily expanded by adding expansion battery packs in parallel connection.