1. Iron Phosphate-lithium Battery Powerwall :95% DOD , More than 2500 cycle times 2. Long warranty period:1 years 3. Higher energy density,smaller volume for household. 4. Support Connected in parallel mode for expansion (up to 6 pieces). 5. Photovoltaic system:this battery pack is designed for household photovoltaic systems. 6. Battery management system(BMS):the battery packs built-in BMS monitors its operation and prevents the battery from operating outside design limitations. 7. Expand ability: this battery pack can be easily expanded by adding expansion battery packs in parallel connection.