Because you may have these spread out across your home or office, you might wind up requiring two or more UPSes to keep the network going. That may include a broadband modem, a VoIP adapter for phone calls, one or more Wi-Fi routers, one or more ethernet switches, and/or a smart home hub. It’s not always easy to figure out if your device has active PFC when in doubt, opt for a pure sine wave-the additional cost has come way down.Įven for equipment that isn’t susceptible to power-supply problems, a stepped sine wave can cause a power supply to emit a high-pitched whine when it’s on battery power.Įxamine all the devices that make up your network. If your device has active power factor correction (PFC) or incorporates fragile or sensitive electronics, especially for audio recording, you likely need a pure sine wave. It could cause premature wear on components or cause them to outright shut down or cause additional damage. A rough simulated sine wave can be a showstopper for certain kinds of computer power supplies, which have components that interact poorly with the voltage changes. In the event of a blackout, it will switch to battery power within a few milliseconds.Ī UPS might produce a pure sine wave, which adds to cost, or a stairstepped one, in which power shifts more abruptly up and down as it alternates. The Tripp Lite Smart1500LCDT is a line-interactive UPS, meaning it feeds connected devices conditioned power while it charges its battery at the same time. If it happens frequently or in quick succession, your UPS might not be up to the task and provide enough delay that a desktop system or hard drive loses power long enough to halt its operating system or crash. (That’s as opposed to most surge protectors, which extinguish a “protected” LED on their front, but continue to pass power.)įor power sags and undervoltage, a standby model will tap the battery. At that point, all the UPS models I checked stop passing power through. These MOVs shift power to ground, but eventually burn out after extensive use. With electronics, extended undervoltage has the potential damage some power supplies.Ī standby model typically relies on dealing with excess voltage by having inline metal-oxide varistors (MOVs), just as in standalone surge protectors. This can mess with motor-driven industrial and home equipment-many appliances have motors, often driving a compressor, as in a refrigerator or freezer.
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