Our picks · Hardware facts first
Best UPS
The battery backup units we would buy to keep a NAS, a router, a home lab rack or an AI workstation running long enough to shut down cleanly when the power goes out, sine wave output on battery first, each chosen from its own tested review and the maker’s own spec sheet. NAS boxes are on Best NAS. There are no prices here: every link goes to the retailer, where the current price is shown.
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Best pick in each tier
UPS units · Small, 1000VA
Photo: CyberPower CyberPower CP1000PFCLCD
A line-interactive mini-tower that CyberPower lists with sine wave output on battery and a USB port for shutdown software. Wirecutter measured 90 minutes on a modem and router, but only 6 minutes at 300W and a 535W peak, so it suits a small NAS and network gear, not a big PC.
Check price at Amazon Why we picked it Paid link
UPS units · Tower, 1500VA
Photo: Eaton Eaton SMART1500PSRTNC
The one tower on this page with its output on battery captured on an oscilloscope: LTT Labs recorded a sine wave after a grid dropout, and measured about 7 ms to switch over. Eaton lists pure sine output, 1050W, all 10 outlets on battery and a network card in the box. The catch is runtime: Eaton rates 8 minutes at half load and 2.5 at full load.
Check price at Amazon Why we picked it Paid link
UPS units · Rack, 1U or 2U
Photo: CyberPower CyberPower CP1500PFCRM2U
A 2U unit with sine wave output on battery, 1000W, eight outlets that are all battery-backed, a USB port and a slot for an optional network card. At 10.5 inches deep it fits a short rack. ServeTheHome notes its runtime is sized to let devices shut down, not to ride out a long outage.
Check price at Amazon Why we picked it Paid link
UPS units · High power, 2200VA
Photo: Eaton Eaton 5PX2200RT
A line-interactive unit with sine wave output that plugs into an ordinary 20A wall outlet (5-20P) and takes up to four extra battery modules. StorageReview ran this model in its own test lab and, with one extra module on a 200 to 220W load, estimated close to 3 hours. Eaton marks it "to be discontinued", so check stock first.
Check price at Amazon Why we picked it Paid link
UPS units · High power, 3000VA
Photo: Eaton Eaton 9PX3000RTN
An online double-conversion UPS that Eaton lists with a true sine wave output, 3000VA and 2700W. A USB port and a gigabit network card come in the box. StorageReview installed it in a lab rack and rates it for small server setups. The plug is an L5-30P, so it needs a 30A twist-lock outlet, not an ordinary wall outlet.
Check price at Amazon Why we picked it Paid link
UPS units · AI systems, 6kVA
Photo: Eaton Eaton 9PX6K-L
A lithium-ion online double-conversion UPS with true sine wave output, for loads too big for an ordinary outlet. It is rated 5400W at 240V and 4800W at 208V. It needs a 200 to 240V circuit, either a 30A L6-30P twist-lock outlet or a hardwired feed. StorageReview measured no gap in double-conversion mode and 22 ms in high-efficiency mode.
Check price at Amazon Why we picked it Paid link
UPS units
UPS units · tier 1 of 6
Small, 1000VA
A small UPS for one NAS, a router and a modem. One model has both a maker sheet that names sine wave output on battery and a tested review, so this tier has one pick.
1 pick, best first
Best pick
CyberPower CP1000PFCLCD 1000VA mini-tower
Photo: CyberPower A line-interactive mini-tower that CyberPower lists with sine wave output on battery and a USB port for shutdown software. Wirecutter measured 90 minutes on a modem and router, but only 6 minutes at 300W and a 535W peak, so it suits a small NAS and network gear, not a big PC.
Suits you if
- You want sine wave output for a NAS or PC with an active-PFC power supply.
- Your load is a NAS, a router and a modem, not a gaming PC.
Skip it if
- You plan to add a gaming PC: Wirecutter measured a 535W peak and 6 minutes at 300W.
- You want the longest runtime: the 1500VA unit below has a bigger battery.
- Capacity
- 1000VA / 600W, per CyberPower
- Topology
- Line-interactive with automatic voltage regulation, per CyberPower
- Output on battery
- Sine wave, per CyberPower
- Outlets
- 10 total: 5 battery and surge, 5 surge only, per CyberPower
- Management
- USB (HID) port, dry-contact relay, free PowerPanel software, per CyberPower
- Runtime
- 6 minutes at half load, 2 minutes at full load, per CyberPower
- Tested
- 90 minutes at 20W, 6 minutes at 300W, 535W peak output, per Wirecutter
Specs from CyberPower CP1000PFCLCD product page; tested in Wirecutter, best uninterruptible power supply.
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UPS units · tier 2 of 6
Tower, 1500VA
A tower UPS for a NAS and a desktop PC. Sine wave output on battery suits PCs and NAS boxes with active-PFC power supplies. The Eaton is first because a lab captured its battery output on an oscilloscope; the CyberPower has the longer runtime test.
2 picks, best first
Best pick
Eaton SMART1500PSRTNC 1500VA slim tower
Photo: Eaton The one tower on this page with its output on battery captured on an oscilloscope: LTT Labs recorded a sine wave after a grid dropout, and measured about 7 ms to switch over. Eaton lists pure sine output, 1050W, all 10 outlets on battery and a network card in the box. The catch is runtime: Eaton rates 8 minutes at half load and 2.5 at full load.
Suits you if
- You want a sine wave on battery that a lab has seen on a scope, not just on a spec sheet.
- You want every outlet on battery and remote monitoring without buying a card.
Skip it if
- You want runtime: Eaton rates 2.5 minutes at full load.
- You want rack ears in the box: it fits 2U of a rack only with Eaton’s optional RKTRYPSC kit.
- Capacity
- 1500VA / 1050W, per Eaton
- Topology
- Line-interactive, per Eaton
- Output on battery
- Pure sine wave, per Eaton
- Outlets
- 10 NEMA 5-15R, all battery and surge, in three switchable load banks, per Eaton
- Input plug
- NEMA 5-15P on a 5 ft cord, per Eaton
- Management
- Network card included (RJ45), USB-C and NFC, per Eaton
- Runtime
- 8 minutes at half load, 2.5 minutes at full load, per Eaton
- Tested
- Sine wave on battery captured on an oscilloscope; about 7 ms to switch to battery, per LTT Labs
Specs from Eaton SMART1500PSRTNC data sheet; tested in LTT Labs, Sine Waves and Spec. Sheets: UPS Considerations.
Check price at Amazon Paid link2nd pick
CyberPower CP1500PFCLCD 1500VA mini-tower
Photo: CyberPower CyberPower lists sine wave output on battery, 1000W, six battery outlets and a USB port for shutdown software. Popular Mechanics ran a battery rundown and kept a modem and router up for about 137 minutes. Wirecutter's surge test let 628.4 volts through, more than its picks.
Suits you if
- You want one UPS for a NAS and a desktop PC with an active-PFC power supply.
- You want a USB port the NAS can read for a safe shutdown.
Skip it if
- You want a remote network card: this model has none, so look at the rack units below.
- Surge clamping is your first concern: Wirecutter measured 628.4 volts let through.
- Capacity
- 1500VA / 1000W, per CyberPower
- Topology
- Line-interactive with automatic voltage regulation, per CyberPower
- Output on battery
- Sine wave, per CyberPower
- Outlets
- 12 total: 6 battery and surge, 6 surge only, per CyberPower
- Management
- USB (HID) port, dry-contact relay, free PowerPanel software; network card not offered, per CyberPower
- Runtime
- 10 minutes at half load, 2.5 minutes at full load, per CyberPower
- Tested
- About 137 minutes on a modem and router, per Popular Mechanics
Specs from CyberPower CP1500PFCLCD product page; tested in Popular Mechanics, CyberPower CP1500PFCLCD review.
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UPS units · tier 3 of 6
Rack, 1U or 2U
Rack units for a home lab, both with sine wave output on battery and a USB port a NAS or a monitoring computer can read.
2 picks, best first
Best pick
CyberPower CP1500PFCRM2U 2U rack
Photo: CyberPower A 2U unit with sine wave output on battery, 1000W, eight outlets that are all battery-backed, a USB port and a slot for an optional network card. At 10.5 inches deep it fits a short rack. ServeTheHome notes its runtime is sized to let devices shut down, not to ride out a long outage.
Suits you if
- You have a short or network rack and want every outlet on battery.
- You want sine wave output for a NAS and servers with active-PFC power supplies.
Skip it if
- You want network monitoring built in: ServeTheHome notes the add-in card costs as much as the UPS.
- You need a long outage runtime: CyberPower rates 3.1 minutes at full load.
- Capacity
- 1500VA / 1000W, per CyberPower
- Topology
- Line-interactive with automatic voltage regulation, per CyberPower
- Output on battery
- Sine wave, per CyberPower
- Outlets
- 8 total, all battery and surge protected, per CyberPower
- Management
- USB (HID) port, dry-contact relay; optional RMCARD205 network card, per CyberPower
- Runtime
- 10.2 minutes at half load, 3.1 minutes at full load, per CyberPower
- Depth
- 10.5 inches, per CyberPower
Specs from CyberPower CP1500PFCRM2U product page; tested in ServeTheHome, CyberPower CP1500PFCRM2U review.
Check price at Amazon Paid link2nd pick
Eaton 5P1500R-L 1U rack
Photo: Eaton Eaton lists a 1U line-interactive unit with true sine wave output, 1100W, a lithium-ion battery and USB plus RS-232 ports. ServeTheHome found two programmable outlet groups, a battery that connects at the front without opening any panels, and a slot for Eaton’s optional network card.
Suits you if
- You want a 1U unit with true sine wave output and a lithium-ion battery.
- You have a full-depth rack.
Skip it if
- You have a short rack: it is 21.8 inches deep.
- You want many outlets: it has five.
- Capacity
- 1440VA / 1100W, per Eaton
- Topology
- Line-interactive, per Eaton
- Output on battery
- True sine wave, per Eaton
- Outlets
- Five NEMA 5-15R, per Eaton
- Management
- USB (HID) and RS-232 ports; network card optional, per Eaton
- Battery
- Lithium-ion, per Eaton
- Depth
- 21.8 inches, per Eaton
Specs from Eaton 5P1500R-L product page; tested in ServeTheHome, Eaton 5P 1U lithium-ion review.
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UPS units · tier 4 of 6
High power, 2200VA
For a NAS full of drives, a workstation or a small server, up to 1920W. The Eaton plugs into an ordinary 20A wall outlet and was run in StorageReview’s lab; the CyberPower needs a 30A twist-lock outlet and has no published test yet, but CyberPower rates it for the longest runtime here.
2 picks, best first
Best pick
Eaton 5PX2200RT 2U rack or tower
Photo: Eaton A line-interactive unit with sine wave output that plugs into an ordinary 20A wall outlet (5-20P) and takes up to four extra battery modules. StorageReview ran this model in its own test lab and, with one extra module on a 200 to 220W load, estimated close to 3 hours. Eaton marks it "to be discontinued", so check stock first.
Suits you if
- You have a 20A wall outlet and want long runtime from extra battery modules.
- You want a unit that fits a rack now and stands as a tower later.
Skip it if
- Your outlet is an ordinary 15A one: the 5-20P plug needs a 20A outlet.
- You want a model Eaton will keep making: it is marked to be discontinued.
- Capacity
- 1950VA / 1920W, per Eaton
- Topology
- Line-interactive, per Eaton
- Output on battery
- Sine wave, per Eaton
- Outlets
- 8 NEMA 5-20R, per Eaton
- Input plug
- NEMA 5-20P on an 8 ft cord, per Eaton. It needs a 20A wall outlet.
- Extra runtime
- Up to 4 extended battery modules (5PXEBM48RT), per Eaton
- Management
- One card slot; network card optional, per Eaton
- Tested
- Run in StorageReview’s test lab; about 3 hours estimated with one extra module at 200 to 220W, per StorageReview
Specs from Eaton 5PX2200RT product page; tested in StorageReview, Eaton 5PX UPS in its test lab.
Check price at Amazon Paid link2nd pick
CyberPower PR2200LCD 2200VA tower
Photo: CyberPower A line-interactive tower that CyberPower lists with sine wave output on battery, 1980W, and all 10 outlets on battery. CyberPower rates 26 minutes at half load and 8 at full load, and a 4 ms transfer time. It has USB, serial and a slot for a network card. Two catches: the plug is an L5-30P twist-lock, and no outlet has published a test of it yet.
Suits you if
- You want the longest rated runtime on this page at its size, and a 30A twist-lock outlet is in place.
- Your load is a NAS, a workstation or a small server, up to 1980W.
Skip it if
- You only have ordinary wall outlets: the L5-30P plug does not fit them; the Eaton 5PX2200RT above does.
- You want a unit an outlet has tested: no tested review of this model is out yet, so every figure here is CyberPower’s own.
- Capacity
- 2200VA / 1980W, per CyberPower
- Topology
- Line-interactive with automatic voltage regulation, per CyberPower
- Output on battery
- Sine wave, per CyberPower
- Outlets
- 10, all battery and surge: 8 NEMA 5-15R, 2 NEMA 5-20R, per CyberPower
- Input plug
- NEMA L5-30P on a 10 ft cord, per CyberPower. This plug needs a 30A twist-lock circuit.
- Management
- USB, serial, SNMP card slot, relay and EPO, per CyberPower
- Runtime
- 26 minutes at half load, 8 minutes at full load, per CyberPower
- Transfer time
- 4 ms typical, per CyberPower
Specs from CyberPower PR2200LCD product page; no tested review of this model yet.
Check price at Amazon Paid link
UPS units · tier 5 of 6
High power, 3000VA
For several servers, a large NAS or a workstation with a big GPU. The first two are online double-conversion units with tested reviews; the third, CyberPower’s PR3000LCD, is line-interactive with the longest rated runtime here but no published test yet. All three plug into a 30A twist-lock outlet, so check your circuit first.
3 picks, best first
Best pick
Eaton 9PX3000RTN 2U rack or tower
Photo: Eaton An online double-conversion UPS that Eaton lists with a true sine wave output, 3000VA and 2700W. A USB port and a gigabit network card come in the box. StorageReview installed it in a lab rack and rates it for small server setups. The plug is an L5-30P, so it needs a 30A twist-lock outlet, not an ordinary wall outlet.
Suits you if
- You have a 30A twist-lock outlet and want sine wave output with a network card included.
- Your NAS, servers or workstation draw up to 2700W together.
Skip it if
- You only have ordinary wall outlets: the L5-30P plug does not fit them.
- You need a long outage runtime: Eaton rates 5 minutes at full load.
- Capacity
- 3000VA / 2700W, per Eaton
- Topology
- Online double-conversion, per Eaton
- Output on battery
- True sine wave, per Eaton
- Outlets
- 7 total: 6 NEMA 5-20R and 1 L5-30R, per Eaton
- Input plug
- NEMA L5-30P on an 8 ft cord, per Eaton. This plug needs a 30A twist-lock circuit.
- Management
- USB port, RS-232 port, gigabit network card included, per Eaton
- Runtime
- 5 minutes at full load, per Eaton; no half-load figure listed
- Tested
- StorageReview reviewed it in its lab rack and published no runtime test
Specs from Eaton 9PX3000RTN product page; tested in StorageReview, Eaton 9PX3000RTN UPS review.
Check price at Amazon Paid link2nd pick
Tripp Lite SU3000RTXL2U 2U rack or tower
Photo: Tripp Lite An online double-conversion unit that Tripp Lite lists with pure sine wave output, 3kVA and 2.7kW, six 5-15/20R outlets and one L5-30R. It is the only unit in this class with a measured runtime: StorageReview ran it from 43 minutes at a 500W load down to 5.5 minutes at 2,500W. The plug is an L5-30P, so it needs a 30A twist-lock outlet.
Suits you if
- You want a tested runtime figure before you buy.
- You have a 30A twist-lock outlet and a rack or a spot for a tower.
Skip it if
- You want the network card in the box: it is sold separately.
- You only have ordinary wall outlets: the L5-30P plug does not fit them.
- Capacity
- 3kVA / 2.7kW, per Tripp Lite
- Topology
- Online double-conversion, per Tripp Lite
- Output on battery
- Pure sine wave, per Tripp Lite
- Outlets
- 7 total: 6 NEMA 5-15/20R and 1 L5-30R, per Tripp Lite
- Input plug
- NEMA L5-30P on a 10 ft cord, per Tripp Lite. This plug needs a 30A twist-lock circuit.
- Management
- USB and DB9 serial ports; optional WEBCARDLX network card, per Tripp Lite
- Runtime
- 13.8 minutes at half load, 4.8 minutes at full load, per Tripp Lite
- Tested
- 43 minutes at 500W down to 5.5 minutes at 2,500W, per StorageReview
Specs from Tripp Lite SU3000RTXL2U data sheet; tested in StorageReview, Tripp Lite SmartOnline UPS review.
Check price at Amazon Paid link3rd pick
CyberPower PR3000LCD 3000VA tower
Photo: CyberPower A line-interactive tower that CyberPower lists with sine wave output on battery, 2700W and all 10 outlets on battery, in ordinary 5-15R and 5-20R sockets. CyberPower rates 17 minutes at half load and 6 at full load, longer than the two picks above, and a 4 ms transfer time. It is line-interactive, not online like them, and no outlet has published a test of it yet.
Suits you if
- You want the longest rated runtime in this tier and plain household sockets on the back.
- A short switch to battery is fine for your load.
Skip it if
- You want zero transfer time: the two online units above never switch over.
- You only have ordinary wall outlets: the L5-30P plug does not fit them.
- You want a unit an outlet has tested: no tested review of this model is out yet, so every figure here is CyberPower’s own.
- Capacity
- 3000VA / 2700W, per CyberPower
- Topology
- Line-interactive with automatic voltage regulation, per CyberPower
- Output on battery
- Sine wave, per CyberPower
- Outlets
- 10, all battery and surge: 8 NEMA 5-15R, 2 NEMA 5-20R, per CyberPower
- Input plug
- NEMA L5-30P on a 10 ft cord, per CyberPower. This plug needs a 30A twist-lock circuit.
- Management
- USB, serial, SNMP card slot, relay and EPO, per CyberPower
- Runtime
- 17 minutes at half load, 6 minutes at full load, per CyberPower
- Transfer time
- 4 ms typical, per CyberPower
Specs from CyberPower PR3000LCD product page; no tested review of this model yet.
Check price at Amazon Paid link
UPS units · tier 6 of 6
AI systems, 6kVA
For a GPU workstation or server with several large power supplies, often two to four of them, which on 120V means plugging into two or more separate circuits. One 200 to 240V unit can feed them all from one circuit instead. One model has both a maker sheet and a tested review, so this tier has one pick.
1 pick, best first
Best pick
Eaton 9PX6K-L 3U rack or tower
Photo: Eaton A lithium-ion online double-conversion UPS with true sine wave output, for loads too big for an ordinary outlet. It is rated 5400W at 240V and 4800W at 208V. It needs a 200 to 240V circuit, either a 30A L6-30P twist-lock outlet or a hardwired feed. StorageReview measured no gap in double-conversion mode and 22 ms in high-efficiency mode.
Suits you if
- Your GPU workstation or server has power supplies that add up to more than a wall outlet can carry.
- You have, or can have an electrician add, a 200 to 240V circuit.
Skip it if
- You only have 120V household outlets: this unit cannot run from them.
- Your power supplies end in standard plugs: the L6-30R and L6-20R outlets need matching cords.
- Eaton lists it as to be discontinued: check stock and its successor first.
- Capacity
- 6000VA / 5400W at 240V; 5400VA / 4800W at 208V, per Eaton
- Topology
- Online double-conversion, per Eaton
- Output on battery
- True sine wave, per Eaton
- Circuit needed
- 200 to 240V, single phase. Eaton recommends a 30A upstream breaker, per Eaton
- Input
- 10 ft cord with an L6-30P plug, or a hardwired feed, per Eaton
- Outlets
- Hardwire output plus 2 L6-30R and 2 L6-20R, per Eaton. There are no standard household outlets.
- Management
- USB cable and RS-232 cable in the box, gigabit network card included, per Eaton
- Runtime
- 17.4 minutes at half load, 8.7 minutes at full load, per Eaton
- Tested
- No measurable gap in double-conversion mode and 22 ms in high-efficiency mode, per StorageReview
Specs from Eaton 9PX6K-L product page; tested in StorageReview, Eaton 9PX 6 kVA Lithium-Ion UPS review.
Check price at Amazon Paid link
How we pick
A unit becomes a pick when the maker publishes a spec sheet that names its capacity in volt-amperes and watts, its topology, its output waveform on battery, its outlets and its management port, and a published review that tested that exact model is saved in our library. Within a tier, sine wave output on battery comes first, because PCs and NAS boxes with active-PFC power supplies are the load these units are built for. Then comes a USB port a NAS can read, then capacity. Every spec on a card comes from the maker’s own page; what a reviewer measured or found is credited to the review by name.
Popularity and commission play no part: a unit is here because of its specs and a test, not because it sells well. Two tiers have one pick each, because only one model in each cleared the bar. A unit a named outlet has tested ranks above one nobody has, whatever the brand; an oscilloscope capture of the output on battery counts most. CyberPower’s PR2200LCD and PR3000LCD are the exception: no outlet has published a test of them yet, but CyberPower rates them for the longest runtime at their sizes. Their cards say so, and every figure on them is CyberPower’s own. We looked for APC Smart-UPS and online units too: none of the current models below 3000VA has a published test yet, so they sit under Also considered. We check the picks again when new reviews come out.
Reading the cards
Watts, not volt-amperes, is the number to size against: add up what you plug into the battery outlets and keep it well under the watt rating. Some outlets on a tower unit are surge-only and stay dark in an outage, so the cards count battery outlets apart. Runtime is the maker’s rating at half and full load; a UPS buys minutes for a clean shutdown, not hours.
The high-power and AI-system units do not plug into an ordinary wall outlet: the plug on each card names the circuit it needs, a twist-lock outlet or a 200 to 240V line that an electrician may have to add. A rig whose power supplies sit on two or more circuits can take one UPS per circuit, or one 200 to 240V unit for all of them if every power supply accepts that input.
The USB port is what lets a NAS see the outage and shut itself down; the rack units also take an optional network card. This page does not show prices, because a page built once cannot keep a price current.
Also considered
Products the reviews we read tested that did not make the cut, and the reason each one missed.
Small, 1000VA
- Tripp Lite by Eaton ECO750UPSTAA. Wirecutter names it as one of the few units it tested with a pure sine wave inverter, but it has no automatic voltage regulation. No maker page for it is saved. Wirecutter, best uninterruptible power supply
Tower, 1500VA
- APC Back-UPS Pro BR1500MS2. Wirecutter tested it and found surge protection on only one of its three power wires. APC's spec tab did not load in a saved copy, so the page has no waveform or management-port field to cite. Wirecutter, best uninterruptible power supply
- APC Smart-UPS SMT1500C. APC lists pure sine output and the well-liked Smart-UPS build, but no outlet has published a test of this model. Custom PC Review tested the older SMT1500, not the SMT1500C we could link. Custom PC Review, APC Smart-UPS 1500VA (SMT1500)
- APC Back-UPS Pro BR1500MS2. LTT Labs uses and measured it, and APC lists sine wave output on battery, but Wirecutter found surge protection on only one of its three wires, and APC’s saved pages do not say which outlets are on battery. LTT Labs, Sine Waves and Spec. Sheets: UPS Considerations
Rack, 1U or 2U
- Online rack units (CyberPower OL, APC SRT, Eaton 9PX, Tripp Lite SU) at 1000 to 2200VA. Online double-conversion units never switch to battery, but we found no published test of any of them below 3000VA. They stay off the list until one is tested. CyberPower OL1500RTXL2U product page
High power, 2200VA
- CyberPower PR2200LCDSL. The other 20A wall-plug unit at this size, but CyberPower rates it for 10.2 minutes at half load and 3.3 at full load with a 10 ms transfer time, and no outlet has tested it. The Eaton 5PX2200RT above covers the same plug with a lab behind it. CyberPower PR2200LCDSL product page
High power, 3000VA
- Eaton 9SX3000. Eaton lists the same 3000VA and 2700W, online, with true sine wave output, but sells the network card separately and gives no runtime on its page, and StorageReview’s review published no runtime test. The Tripp Lite above has a measured one. StorageReview, Eaton 9SX3000 UPS review
- CyberPower PR3000LCDSL. The same 3000VA and 2700W as the PR3000LCD, but CyberPower rates it for 7.5 minutes at half load and 2 at full load against 17 and 6, a 10 ms transfer time against 4 ms, and 7 outlets against 10. It adds an L5-30R outlet, which only matters if a device on it has a twist-lock plug. CyberPower PR3000LCDSL product page
AI systems, 6kVA
- Eaton 9PX6K (lead-acid). StorageReview reviewed it and runs it in its lab. Eaton's page lists it as discontinued. Eaton 9PX6K product page
Questions before you buy
Why does sine wave output matter for a NAS?
Many PCs and NAS boxes use active-PFC power supplies. CyberPower sells its sine wave line for exactly that load, and every pick here puts out a sine wave on battery, so the question does not come up.
What do VA and watts mean on a UPS?
VA is the bigger number on the box. Watts is what the UPS can actually deliver, and it is the number to size against. Add up what you plug into the battery outlets and keep that total well under the watt rating.
Why does the USB port matter?
The USB cable lets the NAS or a monitoring computer see that the UPS has switched to battery, so it can shut down cleanly before the battery runs out. Check your NAS software for UPS support before you buy. NAS health and upkeep.
How long will the battery run my NAS?
Longer at light loads. The makers rate a few minutes at full load and up to about ten at half load. A UPS is for a clean shutdown, not for riding through a long outage.
My AI rig has two or more power supplies on separate circuits. What do I do?
Either give each circuit its own UPS, sized to the power supplies plugged into it, or move the whole rig to one 200 to 240V UPS that feeds every power supply from one circuit. Check each power supply label first: the second way only works if it accepts 200 to 240V input, and the cords must match the UPS outlets. AI systems tier.
Which NAS boxes pair with these?
Any of them. Match the watt rating to the NAS plus the gear you plug in with it. Best NAS.