Best UPS units (2026)
Uninterruptible power supplies for NAS boxes, servers and network kit. Ranked on capacity, output waveform, NAS integration and battery runtime. Compare all UPS units side by side
Researched, not hands-on tested.How we review ›
updated 24 Oct 2026 · ranked by score, value and age- #1
APC Back-UPS Pro BR1600MI
6.0/10verdict: wait for dealThe APC Back-UPS Pro BR1600MI is a 1600 VA / 960 W line-interactive UPS for people who want to protect a NAS, router and switch. It suits buyers who want a battery they can swap themselves and six backed-up outlets. It is a weaker fit if automatic shutdown over USB is essential, because compatibility is unconfirmed.
1600 VA / 960 WLine-interactive8 IEC C13: 6 with battery backup and surge, 2 surge-only; input IEC C14Read the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #2
PowerWalker Basic VI 2200 STL
5.9/10verdict: skipThe PowerWalker Basic VI 2200 STL is a line-interactive UPS for people who want a high power rating for a small stack of network and storage gear. It suits a NAS, router and switch setup that needs USB-signalled shutdown more than long battery time. Buyers should check the exact model before ordering, because the research could not confirm the listing matches this model.
2200VA / 1320WLine-interactiveSimulated sine waveType F, Type E or Type G (4)Read the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #3
Eaton 3S Gen2 UPS 3S550B
5.6/10verdict: skipThe Eaton 3S Gen2 3S550B is a small standby UPS for a home desk or a compact homelab. It suits someone protecting a NAS, router and switch who wants USB-triggered shutdown and a user-replaceable battery. It doesn't suit anyone who needs a confirmed waveform, a published runtime or network management.
550 VA / 330 WOffline/Standby6 UK outlets: 3 with battery backup and surge protection, 3 surge-onlyRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details
- #4
APC Back-UPS BE850G2-UK
5.4/10verdict: skipThe APC Back-UPS BE850G2-UK suits a home office or small desk setup that needs battery backup for a PC, router and switch. It offers six battery-backed UK sockets and a published runtime table. Buyers who need confirmed NAS shutdown support or a pure sine output should check those points first.
850 VA / 520 WStandbyStepped approximation to a sinewave8 total: 6 battery-backed with surge protection and 2 surge-only, all BS 1363A UK socketsRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #5
APC Back-UPS BX750MI
5.2/10verdict: skipThe APC Back-UPS BX750MI is for people protecting a small NAS, router and switch who already own IEC C14 power leads. It suits a buyer who values line-interactive protection and decent battery runtime more than a pure sine wave output. It is less suited to anyone who needs confirmed automatic NAS shutdown or UK 13A sockets on the unit.
750 VA / 410 WLine-interactiveStepped approximation to a sine wave, not pure sineFour IEC 60320 C13 outlets, all battery-backedRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #6
APC Easy UPS BV650I
5.0/10verdict: skipThe APC Easy UPS BV650I is for people who want to keep a router, modem and a few small devices running through short power cuts. It offers 375 W and six battery-backed IEC outlets on a line-interactive design. Anyone who needs confirmed NAS shutdown signalling or a confirmed pure sine wave should check the UK specification first.
650 VA / 375 WLine-interactive (AVR-based)Stepped approximation to a sine wave (taken from the US-market 120V BV650 page; not confirmed for the UK SKU)6 x IEC C13, battery-backedRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #7
Tecnoware ERA PLUS 1200 UK (FGCERAPL1202UK)
4.9/10verdict: skipThe Tecnoware ERA PLUS 1200 UK is for people who want a small line-interactive UPS with UK sockets to cover a few devices. It suits a small, simple load where a short ride-through and basic mains regulation are the goal. It is a weaker fit for anyone who needs documented NAS or NUT shutdown support.
1200 VA nominal; 840 W active power (datasheet also shows a conflicting 360 W figure)Line interactive with stabiliser (AVR)Modified sinewave2 UK outlets plus one fixed UK BS13 input cableRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #8
SKE UPS Battery Backup 1500VA/900W -SK1500
4.9/10verdict: skipThe SKE SK1500 is a 1500VA / 900W rated battery backup for buyers who want a lot of rated capacity and an LCD showing voltage and load. It suits someone protecting a small NAS, router and switch who will check the voltage and outlet details before buying. It is a weaker fit for anyone who needs confirmed USB shutdown signalling or a clearly stated pure sine output.
1500VA / 900W ratedSimulated sine wave in battery mode (third-party, GP1500 related model)8 outlets per manufacturer product page (6 battery-backed plus surge, 2 surge-only, 3.0 column); 2.0 variant shows 4 battery-backed plus 4 surge-only; sources conflictRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #9
APC Easy UPS, 700VA, Tower, 230V, 4x IEC C13 Outlets, AVR
4.2/10verdict: skipThis is a small tower UPS for someone who wants to ride out short power cuts on a router, modem or small NAS. It gives four battery-backed C13 outlets and automatic voltage regulation in a compact 4.2 kg case. It is a poor fit for anyone who needs the UPS to shut a NAS or server down cleanly, because APC lists no USB compatibility.
360 W / 700 VALine-interactiveStepped approximation to a sine wave4 x IEC 320 C13, battery-backed and surge-protectedRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)
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- #10
UPS ERA PLUS 800
3.9/10verdict: skipThe ERA PLUS 800 suits someone who wants basic battery backup for a small, simple load with UK plugs. It is not aimed at servers, workstations or anything with an active PFC power supply. Buyers who need automatic NAS shutdown should check the interface question before ordering.
800 VA / 560 W (max computer power application 560 W; datasheet output table also shows 240 W active power, conflicting)Line interactive with stabiliser (AVR)Modified sinewave2 UK-type outputs; 2 with blackout and child protection, one also with overvoltage protection; BS1363 input cableRead the full review ›Price unavailable right nowCheck price at Amazon UK (opens in a new tab, affiliate link)Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details
Questions
What size UPS does a NAS need?
A 2-4 bay NAS with a router and switch draws about 60-150W. A 600-900VA UPS covers that with time to shut down cleanly.
Why does pure sine wave matter?
Modern power supplies with active PFC can switch off or buzz on a stepped (simulated) sine wave. Pure sine is the safe choice.