1. generator output voltage will cause shocks, and will even as high as ± 10% ~ 20 %(+/- 10% -20%), even when adjusted to the best condition, the output of the shock will still be higher than at least 2% or more of the normal UPS impact on working conditions, the most extreme situation is that UPS cannot be transferred to the state electricity to run, and will cause direct energy consumption of batteries.

2. the current shock: even when UPS brought about by the work of the stability of the non-linear load, the oil machine output current was still ± 20% ~ 50 %(+/- 20% -50%) within the framework of shock, and this shock is unable to adjust.

3. frequency vibration: frequency range of vibration is usually smaller than the voltage and current amplitude vibration, but its impact is greater, which led directly to UPS and battery-powered electricity in the city frequently to switch between states. At the same time, because diesel engines lead to increase the vibration of its own to accelerate mechanical wear according to the load change, and resulting in the premature aging and even damaged parts.