You can get a UPS (Uninterruptible Power Supply) for computers/tvs, etc that charge an internal battery off of the 120V mains, and provide the equipment with a stable 120V environment, even in the event of power failures.
Is there such a thing in the 12V world? A capacitor bank isn't really the same, and i could build my own... but I'd have to dig up my power supply design textbooks from college... I'm not that kind of electrical engineer.
Does such a thing exist, commercially?
Is there such a thing as a 12v UPS?
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