By allowing the grounding relay, when the Xtender XTM pure sine wave inverter is disconnected from the grid, the Inverter uses the Xtender XTM pure sine wave inverter function to from a power grid by using the energy of the battery to ground the neutral point in the automatic AC output. In some applications, it is hoped that when the input terminal is not charged, the upstream and downstream of the neutral point can be separated while the grounding system is reestablished. The parameter {1485} is prohibited and can be modified through rcc-03.