Backup changeover box for the Huawei hybrid inverters. Supplied with a motorized 3 position 2 poles changeover (1F+N), up to 40A - 230VAC, designed to disconnect the facility from grid if it doesn't supply energy. Output PV point protected with MCB 2P 40A and RCD A-HI 30 mA. Due to a phase monitoring relay, the equipment switches to backup mode and home is supplied from backup battery and solar panel. Backup option enables a higher independence and flexibility thanks to Huawei inverter. Cable section 10 mm2, terminal section 10 mm2. Metallic sheet cabinet treated with a protective coating against corrosion, colour RAL 7035, ingress protection against water and dust IP66 and impact resistance IK10. Cabinet size 400x400x150mm.