The DC-UPS powers your equipment inside the car or truck using the car or truck electrical system, but switches to exterior battery power in the event the car or truck's battery is eradicated, stolen, or drops beneath a predetermined voltage, performing as being a battery backup (BBU) and power conditioner. https://keeganikkhf.slypage.com/34665686/new-step-by-step-map-for-12v-power-supply-backup