9 Best UPS for NAS | Pure Sine Wave Or Bust For Your Rack

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A 2.3-inch-deep box that mounts to a wall and keeps your modem alive — not a server UPS.

At 7.1 x 10 x 2.3 inches and 4.4 pounds, this is the unit you tuck into a media cabinet or screw to the wall above your router. The 300W ceiling and 600VA capacity cover a modem, router, and VOIP box with room to spare. The keyhole slots on the bottom are spaced in a 100 x 100 mm VESA pattern, so a wall plate or a couple of screws handles the mounting. That is a real advantage when your NAS lives in a rack but your networking gear is scattered around the house.

Where it leads with the crowd is reliability during short interruptions. It outputs a clean sine wave that keeps connected gear running without the stress of a stepped wave. It also has one quirk worth knowing: it will power on without AC present, so you can move it to another outlet during an outage without it refusing to boot.

A few buyers hit a genuine hiccup: the switchover can be slow enough that on one or two encounters the connected gear rebooted, and another noted no alert when power was lost or overloaded. This is a modem-and-router companion, not a full desktop sustainer — the 1.2-minute average battery life figure on the spec sheet is a short-burst number for lighter loads, not a server-grade runway.

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An LCD readout and 240W for a light NAS — the entry point that shows you its own battery level.

This is the dashboard build: a 240W ceiling on 425VA capacity, six outlets (four with battery backup plus two surge-only), and a built-in LCD that shows input voltage, output voltage, battery capacity, and load level in real time. You can watch the load number climb when your drives spin up and see the battery percentage tick down during an outage. For a first UPS on a budget rack, that display is the useful part — it tells you whether you have headroom before you find out the hard way.

Compared with the APC 850VA above, the SKE trades capacity. The APC carries 510W versus 240W here — a 2.1x gap in sustained wattage and a 2.0x gap in VA (850 versus 425). That is fine for a two-bay NAS plus router, and uncomfortable for a bigger array. Weigh your drive count before you buy, because the ceiling is the whole story on this box.

The honest trade-off is runtime under real load. Some buyers found the battery ran dead quickly under heavier draw, and a couple of units failed outright early — the recurring notes point to this being a lighter-duty unit that expects modest loads. It ships also with a management software package, though setup needs some tinkering to get working on current Windows. Kept inside its wattage window, it earns its slot for a small network shelf.

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The one labeled for routers and NAS — 330W, a phone-charging USB port, and a swappable battery.

APC put the words “Router, NAS” right on the box for this one, and the specs back it: 600VA on 330W, five battery-backed outlets plus two surge-only, and 23 minutes of runtime at a 100W load. For a router, modem, and a modest NAS that runs one or two bays, this hits the target. The built-in 1.5A USB port also keeps a phone or a small device topped up during an outage, which is the sort of small extra that matters when the lights are out.

What lives up to the sales pitch is the ease of setup. Plug it in, connect your NAS, and the box shows up to your management software without fuss — a good number of buyers run it this way with small servers and network switches. The battery is user-replaceable via APC’s APCRBC154, so a tired cell is a sat-down swap rather than a trip to the recycling bin. Software support covers both Windows and Mac with native settings on the latter.

The trick is to check the size of what you plug in. Runtime shrinks fast once a full PC load lands on it; keep the NAS, router, and modem on battery, and let a printer or lamp run off the surge-only pair. A handful of units arrive with an already-dead battery, so charge-test yours on day one and use the return window if it fails. Beyond that, it is a solid, boring, well-behaved box that does exactly what the label promises.

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A 10-outlet mini-tower with an LCD that tells you exactly how many minutes you have left.

Ten NEMA 5-15R outlets — five battery-backed, five surge-only — on a 1000VA/600W platform, plus two USB charge ports at 2.1A shared. That outlet count is the draw for a small server shelf where the NAS, router, switch, and a couple of peripherals all want a plug. Five of those live on the battery, so you can segregate the critical gear from the things that can fizzle. The six-foot right-angle input cord adds reach to a wall socket behind a rack.

Owners single out the multifunction LCD, which shows estimated runtime, load, and charge percentage in real time. It shows estimated runtime, battery capacity, load capacity, line voltage, and charge percentage in real time — so you can verify the load before you commit a rack to it. The AVR corrects minor voltage swings without tapping the battery, which stretches the cell’s life. A 5-year warranty covers the unit and the battery, backed by a connected equipment guarantee — the kind of cover that gives a home server owner some breathing room.

The recurring gripe is that it is not the lightest or cheapest on the shelf — 15 pounds and a mid-range price tag make it a deliberate purchase. It uses a simulated sine wave, so check your NAS power supply if you have a high-efficiency PFC unit that might object. Kept within its own walls, this is a well-behaved jack-of-all-trades for a multi-device shelf.

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The lithium cell that promises 5,000+ charge cycles — and the one most likely to skip a battery swap.

This is the pick for the buyer who does not want to think about battery replacement. It runs a lithium iron phosphate (LiFePO4) battery — the same chemistry family as many long-life solar and EV cells — rated for 5,000+ charge cycles and a lifespan of over 10 years. The 1000VA/600W pure sine wave output plays nicely with active-PFC power supplies. Eight outlets sit on the back, and the built-in battery management system keeps the cell inside safe voltage and temperature limits. There’s also a low-noise fan that kicks in during heavy battery use, rated under 50 dB.

Owners tend to call out the clean single-button setup: one press powers it on, a long press shuts it down, and a short tap mutes the buzzer. The LCD shows the key info without a maze of menus, and the lightweight build is easier to lift into a shelf than a heavy lead-acid brick. A couple of owners upgrading from older APC and CyberPower units noted how much lighter it is to lift onto a shelf.

The obvious gap: there is no USB or network data port for a NAS to trigger an automatic shutdown. That means you would need to hand-craft a shutdown link or add another UPS that has a data port. If your NAS expects to talk directly to the battery, this is the one to plan around — the long-life battery is real, but the handshake isn’t built in. Check the 600W ceiling against your drive count, too, because a full array can crowd it.

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The one an 8-bay Synology lives on — 1050VA with USB communication that actually works.

The spec that drives the choice here is 1050VA on 600W, with 36 minutes of runtime at a 100W load. That is enough bank for a home server plus modem, router, and switch, and it leaves margin for a disk rebuild spike. The eight outlets split into six battery-backed and two surge-only, and you get USB-C and USB-A charge ports at 5V/3A shared for phones or a small tablet.

What earns it the NAS label is the USB management path. It talks to a Synology box cleanly — the NAS spots the UPS, idles on power loss, and auto-restarts when the wall comes back. Owners mention it riding out multi-hour outages and restarting the NAS normally afterward. The battery is user-replaceable via APC’s APCRBC164, and the 3-year warranty plus equipment protection covers your gear in a surge event.

The capacity is the trade-off you learn to live with. It is not aimed at high-draw desktops — keep it on a NAS, a router, and a modem, and it performs. A couple of units have shipped with battery faults, so the day-one load test is worth doing. For a home server that needs a graceful shutdown and a reliable restart, this is the clean, purpose-built choice.

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The headache cure for active-PFC supplies — 1000W of pure sine wave and a dozen outlets.

If your NAS or home server runs a modern power supply with active PFC, the pure sine wave output on this 1500VA/1000W unit is the reason to buy it. The wave shape matches what a PFC supply expects, which cuts down on the phantom shutdowns and wake-from-sleep failures that rougher UPS output can cause. Twelve NEMA 5-15R outlets — six battery-backed, six surge-only — plus a color LCD that tilts up to 22 degrees and shows load, battery, and runtime. Two USB charge ports, one Type-A and one Type-C, round out the front.

The LCD is the highlight. It logs surges and outages, shows real-time wattage, and lets you see what your rack is drawing without a clamp meter. You can configure shutdown and hibernate triggers from the PowerPanel software, and it works with network monitoring on Linux. AVR handles the small voltage dips without switching to battery, and the 3-year warranty includes the battery with a connected equipment guarantee.

Now the honest bit: it is 24.9 pounds, and the battery is not user-replaceable, so a swollen or dead cell means a service call or a replacement unit. At full load, runtime falls short of the advertised figure — customers note closer to 20-30 minutes, so plan a fast shutdown. It is also not cheap. For a NAS that has a PFC supply and a serious drive count, those trade-offs are worth it.

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The heavyweight for a real server rack — 1000W pure sine wave and remote monitoring built in.

This is the build for a proper server closet, not a shelf: 1500VA on 1000W of pure sine wave output, eight NEMA 5-15R outlets, and a 6-hour recharge time. That capacity keeps a running server above idle for hours — one owner rode out multiple blinks under its 1500W threshold without a dropout. The pure sine wave output protects a modern PSU the way the CyberPower above does, and the AVR keeps low and high voltages trimmed to safe levels so the battery has less work to do.

You can watch it from anywhere with SmartConnect remote monitoring: a secure portal that sends automatic notifications, pushes firmware updates (the unit’s built-in software), and adds advanced support. Setup goes quickly — the battery connects through a rear plug, and the network and USB links into the web app auto-detect your devices. You can turn off the audible alarm, which matters in a home office or bedroom closet. A 3-year repair-or-replace warranty and a connected equipment protection policy back it up.

The weight is the honest part: this is a big, heavy metal box, and it will not slide easily into a light shelf. The rear outlets are also close enough that a bulky adapter can block a neighboring plug. And the premium tier is real — this is the top of this list’s build class. For a real server rack that needs remote alerts and a multi-hour runway, it earns its spot at the top of the range.