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Eaton 3S Gen2 UPS 3S550B vs Tecnoware UPS ERA PLUS 800

Researched, not hands-on tested.How we review ›

all judged against UPS units at a similar price

The Eaton 3S Gen2 UPS 3S550B scores 5.6/10 overall, ahead of the Tecnoware UPS ERA PLUS 800 at 3.9/10.

The Eaton 3S Gen2 UPS 3S550B leads on NAS and server integration, runtime and battery and UK outlets and build.

The Tecnoware UPS ERA PLUS 800 leads on topology and waveform.

They score the same on capacity.

The biggest difference is NAS and server integration, where the Eaton 3S Gen2 UPS 3S550B scores 7/10 to the Tecnoware UPS ERA PLUS 800's 1/10.

Eaton 3S Gen2 UPS 3S550B

5.6/10verdict: good, not the best

The 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.

Typically about £83.99 in the UK when we researched itCheck price at Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Tecnoware UPS ERA PLUS 800

Tecnoware UPS ERA PLUS 800

3.9/10verdict: skip

The 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.

Typically about £59 in the UK when we researched itCheck price at Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Scores, criterion by criterion

CriterionWeightEaton 3S Gen2 UPS 3S550BTecnoware UPS ERA PLUS 800
Topology and waveform25%4/105/10
NAS and server integration25%7/101/10
Capacity20%6/106/10
Runtime and battery15%5/104/10
UK outlets and build15%6/104/10
Overall5.6/103.9/10

Specifications

SpecEaton 3S Gen2 UPS 3S550BTecnoware UPS ERA PLUS 800
Capacity (VA / W)550 VA / 330 W800 VA / 560 W (max computer power application 560 W; datasheet output table also shows 240 W active power, conflicting)
TopologyOffline/StandbyLine interactive with stabiliser (AVR)
Output waveformnot listedModified sinewave
Outlets6 UK outlets: 3 with battery backup and surge protection, 3 surge-only2 UK-type outputs; 2 with blackout and child protection, one also with overvoltage protection; BS1363 input cable
Runtime at half loadnot listed10-40 min typical backup time (load not stated)
USB / network managementUSB port (HID-compliant), Eaton UPS Companion software, auto shutdown function; no Ethernet or network cardNo USB or network interface on the UK 800 datasheet (interface listed as "-")
Battery12 V / 5 Ah sealed VRLA, one battery, user replaceable12V 7Ah sealed lead-acid, maintenance free

Strengths and weaknesses

Eaton 3S Gen2 UPS 3S550B

  • + USB port is HID-compliant, with automatic shutdown support
  • + Battery is a single user-replaceable sealed unit
  • + Six UK outlets, three of them with battery backup
  • − Offline/standby topology; Gen2 waveform not confirmed by Eaton
  • − Half-load runtime isn't published by the manufacturer
  • − No Ethernet port or network card

Skip it if:

  • Buyers who need a confirmed pure sine wave output
  • Anyone needing network-card monitoring for several servers
  • Users who need a published runtime figure before buying
Read the full Eaton 3S Gen2 UPS 3S550B review ›

Tecnoware UPS ERA PLUS 800

  • + Line-interactive with AVR and 2 ms typical transfer time
  • + Owners praise easy installation and quiet operation
  • + Noise listed below 40 dBA at 1 m
  • − UK datasheet lists no USB or network interface
  • − Modified sinewave; not suitable for active PFC supplies
  • − Only two outputs; capacity figures conflict on the datasheet

Skip it if:

  • Buyers who need USB or network monitoring for automatic NAS or server shutdown
  • Anyone protecting servers, workstations, gaming PCs or other active PFC power supplies
  • Users who need more than two outlets or long runtime on heavier loads
Read the full Tecnoware UPS ERA PLUS 800 review ›

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