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When the Raspberry Pi is connected to a car ignition or the USB port on a TV, you run the risk of data loss with a hard shutdown. The Pi UPS bridges short lapses in the power supply and shuts down your Rasp Pi safely when the power remains off.
The Raspberry Pi with its meager consumption of only 3 watts is predestined to be the brain for an infoscreen [1] or a simple entertainment center for a TV in the home, car, or RV. Generally, the Raspberry Pi only needs 5 volts from the USB port of a monitor or TV. It can also snatch up power from the on-board power supply of a car or truck via a USB adapter.
However, this method of receiving power has a huge disadvantage. When you shut the TV off or turn the ignition off, you cause an abrupt interruption in the flow of power to the Raspberry Pi. In the long run, you will have to reckon with the danger that these interruptions can lead to a loss of data or a damaged operating system. To prevent the occurrence of such problems, you must perform an orderly shutdown of the Raspberry Pi before turning off any devices the Pi is working with. This approach is not so easy when the Raspberry Pi is hidden behind something like the dashboard of a car.
For those who want to be certain that the Raspberry Pi has time for a proper shutdown, the Pi UPS [2] for the GPIO port of the Raspberry Pi is an excellent solution (see Table 1). German manufacturer CW2. electronics offers an uninterruptible power supply (UPS) that you can attach to the little computer to protect it in the event of loss of power from the regularly used source. The power is drawn from a battery pack, and the computer is shut down after a time interval of your choosing.
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