Your explanation is better and more thorough. On Wed, 12 Jul 2023 at 13:35, Scott Allen <[email protected]> wrote:
> On Wed, 12 Jul 2023 at 12:37, Karen Lewellen via talk <[email protected]> > wrote: > > How expensive are UPS units, and how do they work? > > I was typing this when Don Tai replied but I'll post it just in case > anything additional I've said is helpful: > > UPS stands for Uninterruptible Power Supply, sometimes also called a > "battery backup" unit. It's a piece of equipment that contains a > rechargeable battery, connects to your building's AC power (usually by > just plugging it into a standard AC outlet) and has AC receptacles on > it that you plug your equipment into instead of plugging them directly > into the wall. You could think of it as a big power bar with a battery > in it. > > The battery is kept continually charged by a built-in battery charger > while it's plugged in. If the power fails, an DC to AC converter > (called an inverter) switches to the outlets and continues to provide > AC power to your equipment. When mains power is restored, the battery > is switched out and the AC is switched in and the battery is again > charged. Thus, it provides "uninterruptible" AC power to your > equipment. Like power bars, most UPSs also provide surge protection > and sometimes also other line conditioning. > > The cost and size of the UPS you require will depend on how much power > the equipment you want to keep running draws and how long you have to > keep it running. For your requirements, the size could vary from about > 12 inches square to the size of a large suitcase. Cost could be from > maybe $75 to many hundreds. > > -- > Scott >
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