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Eaton 3S Gen2 UPS 3S550B vs Eaton Ellipse PRO 850 IEC

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

all judged against UPS units at a similar price

The Eaton Ellipse PRO 850 IEC scores 6.7/10 overall, ahead of the Eaton 3S Gen2 UPS 3S550B at 5.6/10.

The Eaton Ellipse PRO 850 IEC leads on topology and waveform, NAS and server integration, capacity and UK outlets and build.

They score the same on runtime and battery.

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

Eaton Ellipse PRO 850 IEC

6.7/10verdict: buy

The Eaton Ellipse PRO 850 IEC suits anyone who wants to protect up to three devices from one spot and is happy with USB-only monitoring. It offers 510 W, a USB HID port with Eaton UPS Companion software and a user-replaceable battery. It is a poor fit for anyone who needs network-card management or long battery runtime.

Typically about £285.92 in the UK when we researched itSearch 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 3S550BEaton Ellipse PRO 850 IEC
Topology and waveform25%4/106/10
NAS and server integration25%7/108/10
Capacity20%6/107/10
Runtime and battery15%5/105/10
UK outlets and build15%6/107/10
Overall5.6/106.7/10

Specifications

SpecEaton 3S Gen2 UPS 3S550BEaton Ellipse PRO 850 IEC
Capacity (VA / W)550 VA / 330 W850 VA / 510 W
TopologyOffline/StandbyLine-interactive
Outlets6 UK outlets: 3 with battery backup and surge protection, 3 surge-only3 x C13 outlets plus 1 C13 surge-only outlet
Runtime at half loadnot listed9 min at half load
USB / network managementUSB port (HID-compliant), Eaton UPS Companion software, auto shutdown function; no Ethernet or network cardUSB port (HID compliant) with Eaton UPS Companion software; no Ethernet or network card
Battery12 V / 5 Ah sealed VRLA, one battery, user replaceable12 V / 9 Ah VRLA sealed lead-acid, one battery, user replaceable

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
  • − 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 ›

Eaton Ellipse PRO 850 IEC

  • + 510 W rating with 97% efficiency at maximum load
  • + HID-compliant USB with Eaton UPS Companion software
  • + User-replaceable battery and three-year warranty
  • − 9 minutes at half load is short
  • − No Ethernet port or network card
  • − Only three battery-backed outlets

Skip it if:

  • Buyers who need network-card or Ethernet-based UPS management
  • Anyone needing more than a few minutes of runtime at moderate load
  • Users with more than three devices that all need battery backup
Read the full Eaton Ellipse PRO 850 IEC review ›

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