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Head-to-head · Best UPS Battery Backups

Eaton 5E 850LI vs Eaton 5P 1550

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Eaton 5P 1550 comes out ahead by a clear margin (3.3 vs 4.0). The gap is mostly about data center users needing rackmount protection — read the strengths below before deciding.

Eaton 5E 850LI
Ranked #6 in Best UPS Battery Backups
Eaton 5E 850LI
$25as of Jun 28

The Eaton 5E 850LI is a line-interactive UPS designed for home and small office use, offering robust electrical protection with AVR and wide voltage tolerance. Reviews note its reliable performance during power fluctuations and USB monitoring capabilities, though some users report inconsistent USB detection and poor customer service experiences. While it provides solid backup functionality, the reliability of its USB interface and support have been criticized. This unit is best suited for users seeking basic UPS protection without complex monitoring needs.

Strengths
  • — Line-interactive topology with Automatic Voltage Regulation (AVR) that corrects under and over voltage without switching to battery
  • — Wide input voltage tolerance of 140–300V with 50/60Hz auto-sensing capability
  • — HID-compliant USB interface for seamless OS-level monitoring without proprietary drivers
Watch-outs
  • — USB control is reported as flaky and unreliable by users
  • — Issues with computer detection of the UPS despite NUT support
  • — Customer service response was described as tedious and unhelpful
$25 · Check Price on AmazonFull review →
Eaton 5P 1550
Higher ratedRanked #2 in Best UPS Battery Backups
Eaton 5P 1550
$1,099as of Jul 7

The Eaton 5P1550GR is a rackmount UPS designed for data center environments, offering 1550 VA / 1100 W capacity with true sine wave output. Reviewers noted its compact 1U form factor and 6 C13 outlets with programmable groups for managing critical and non-critical equipment. The unit features ABM battery management technology that extends battery life and provides advance warnings for replacement. While the device offers solid performance for its class, reviewers pointed out that battery replacement requires user intervention and the included power cord is only 6 feet long. This UPS is best suited for users requiring reliable power protection in rackmount environments.

Strengths
  • — 1U rackmount form factor with compact footprint suitable for data center environments
  • — True sine wave output waveform for reliable power delivery to sensitive equipment
  • — 6 C13 outlets with programmable groups for critical and non-critical device management
Watch-outs
  • — Battery replacement requires user intervention and is not plug-and-play
  • — Limited runtime options without extended battery capability
  • — Power cord is only 6-foot length which may require additional cable management
$1,099 · Check Price on AmazonFull review →

How they stack up

Eaton 5E 850LI

The Eaton 5E 850LI provides wide input voltage tolerance and HID-compliant USB interface, features not found in the APC Back-UPS 600VA. However, it suffers from unreliable USB control and poor customer service, unlike the more reliable Tripp Lite OMNI 1500LCD which offers better software support and consistent performance.

Eaton 5P 1550

The Eaton 5P 1550 offers a 1U rackmount form factor and true sine wave output, features not available in the Tripp Lite OMNI 1500LCD. However, it requires user intervention for battery replacement and has a shorter power cord compared to the more user-friendly APC Back-UPS Pro 1500VA.

Specs side-by-side

SpecEaton 5E 850LIEaton 5P 1550
VA Rating850 VA / 450 W1550 VA
TopologyLine-InteractiveLine-interactive
WaveformTrue Sine WaveTrue Sine Wave
Input Voltage140–300V230V default (200/208/220/230/240V)
Battery TypeSealed lead-acidSealed, lead-acid
Wattage—1100 W
Outlets—6 C13
Runtime—upwards of 70 minutes
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