It does not create any humming noise from inductive load such as fans and it supports wide range of batteries from 100 ah to 180 ah. Over load/short circuit protection: If the UPS is excessively overloaded in UPS mode or encounters a short circuit, it will go into protection mode. The output will shut down in this case. Battery deep discharge/over charge protection: The UPS has in-built electronic protection circuit that protects the batteries from getting deep discharged or over charged.