In the recent past, the requirement of backup sources has increased exponentially and
necessitated massive energy storage devices like lead-acid batteries, and super-capacitors. Especially
these power backup resources become inevitable, while installing critical diagnostic and
lifesaving equipments. The storage system, usually lead-acid battery bank, needs to be connected
to the electrical appliances through a converter station where the energy conversion takes place.
Such practices are involved in medical emergency appliances of uninterrupted power supply. The
devices like monitoring instruments, patient’s artificial respiratory systems, light loads in operation
theaters, motor loads and other electronic devices of laptop & desktop computers act as a
source of harmonics. Apart from these, the sine wave / square wave inverter also introduces harmonics
as well as micro ripples on the battery side. These micro frequency components have certain
impacts on the storage system performance, efficiency, and utilization of electrical energy.
This work investigates the impact of micro frequency components on the lead-acid storage battery
when it is operating with a sine wave inverter supplying Resistive load and RLE load. In order to
perform the investigation, a hardware test bench was created. The results of laboratory tests on a
lead-acid battery show that batteries lose capacity and the utilization gets reduced by the frequent
use. This manuscript opens up a new direction of research in the medical emergency backup system
operating with a 12V DC system.