NEW CHOICE(NC)Series Inverter/Charger is the latest model designed by Neway Power, developed on the base of NW series, itsolved the low frequency the problem of heavy and low efficiency. The transfer time is 3ms only, and function is more reliable andpowerful. And you can choose the priority of battery and AC power. It is an ideal for home use, special truck, RV, solar power systemand so onBattery power and grid power priority can be chosen function is our special design for the solar power system, you can choose ACpower Priority or Battery Power Priority For the solar power system, you usually need solar power firstly so you choose battery priority.and when the battery is low, the system will transfer AC power automatically, If for home use, we usually choose AC power priority.When there is no AC power, the inverter transfer into battery and inverter mode automatically. when the AC comes, it transfer to AC power automatically. It is the best choice for the solar power system!