1.1 Wide working voltage of AC 160~250V, and working frequency of 20~100Hz, can insure the engine still be charged at the low speed of rotation (users can directly replace the fuselage charger, or supply electricity for the whole city).

1.2 It can work in a wide temperature between -40℃and +50℃, and can be used in a 98%RH wet condition without congealing.

1.3 Constant current and fast charging. When the pressure of charge battery lower than the set value (12V battery group<12V, 24V battery group<24V), charge engine will work at the highest speed with a constant current. If electrical machine works at the same time, starting current is a large flow (charge engine is close to short circuit), but its constant current feature makes the equipment undestroyed. (See the section of constant current in graph 1)