Power transformer is suitable for 800 w, the largest output power 500 w. Small transformer can't be output power, such as 50 w transformer cannot output power 80 w.Voltage stabilizing function: when the transformer is to 12 v, no voltage stabilizing function, the output , voltage stabilizing function for 8 v to 10 v transformer is, there are fine for the customer to adjust the voltage, voltage stabilizing function to meet the 220 v to 220 v voltage sampling boardHave input reverse connect protection function, With 10 v low voltage under-voltage protection function.Output frequency: 50 hz, could be 'tuned' ( shipment has been adjusted to 50 hz), Output voltage, adjusted to about the 220 v shipment, this kind of ac side voltage regulator has fluctuated.With a small fan when can in transformer output capacitance with fixed waveform, can output approximately sine wave, a capacitive will consume a certain amount of power, reduce the conversion efficiency, do not bring the perceptual load, plus a capacitor is not recommended.The input voltage: 10 v to 15 vOutput waveform: square wave, sine wave (according to the use of transformer and 220 v voltage feedback decision, no feedback square wave)Quasi sine wave inverter plateNeed external 50 hz, 220 v transformer 8-12 v transformer, even 10 v above the feedback voltage 220 v, also may not be to voltage stability, low pressure side of a winding can (standard transformer silicon steel sheet)size:88 x 72 x 46mm Material:ABScolour:Green+whitePackage Contents:1 x inverter drive boardOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.