1. Iron Phosphate-lithium Battery Powerwall :95% DOD , More than 2500 cycle times 2. Battery management system(BMS) 3. Long warranty period: 2years 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. Higher energy density,smaller volume for household.