[What's It Used For] - Used to connect 1 set of BLUETTI AC300&B300 power station with the main panel to build up a home backup system in rated capacity/voltage/power up to 6144Wh / 120V / 3000W. [24/7 UPS Home Backup] - Tie the AC500&B300S power system to your home grid to power your home whenever a blackout occurs. Only a licensed electrician can install the UPS power system. [Compatible Version] - It only works with 100-120V US plug version. [Charging Tip] - This power system can be charged via solar panels or 30A split-phase AC cable or both simultaneously. AC input is only through the 30A split-phase AC cable but not the standard AC. [What You Get] - 1 × 30A outlet box (Reliance), 1 × sub-panel (Include 30A inlet, Reliance), 1 × 30A AC charging cable (L14-30), 1 × TT30 to L14-30. BLUETTI Home Integration Kit by Reliance to Connect the AC300 Power System to the Home Main Panel