Most security gates or barrier systems are equipped with backup power. A good configuration usually includes a primary power supply with an AC motor and an auxiliary motor. These two motors share the same mechanisms, controllers, sensors, communications, etc. The auxiliary motor has its own independent power supply, and if the primary power fails, the auxiliary power supply will take over, moving the barrier as needed without interruption of service.
Problems arise when there is inadequate power for the backup motor. Many gates have been put in place using substandard off-the-shelf UPS (uninterruptible power supplies). These powers supplies might work for brief outages, but when the primary power is out for an extended period of time, such as a blackout or disaster, the batteries for the backup motor become depleted leaving the gate inoperable. Several shorter outages can also drain backup motor's batteries. As a result of this additional strain, the b
For example, California’s rolling brown outs and other power grid struggles gradually depleted the back up battery power in some areas leaving many security gates with NO back up system. Hospitals and other facilities had to leave their gates open or barriers down, compromising their security. Residents to gated communities had to pry open the gates to enter or leave their homes! ETI's own General Manager even had to disassemble his own community's gate mechanism so cars could get out of the community!