Choosing between two Eaton 5P rackmount UPS units for critical power protection is really a question of risk: can you trust a used chassis with visible wear, or do you want a factory-fresh unit with all of its bits included? The 1U Eaton 5P series is a compact answer for servers, switches, and other rack gear that needs clean backup power, and right now the lineup splits into a budget-friendly used unit and a higher-priced new unit.
Quick verdict
If you want the peace of mind of a brand-new, factory-sealed UPS and don't want to hunt for the serial adapter or front trim panel separately, the new Eaton 5P 1U at $289.99 is the easier choice. If you can handle scuffs and a unit that was only power-on verified, the used Eaton 5P1550GR at $174.99 leaves you with more cash for other rack upgrades.
Side-by-side comparison
| Feature | Used Eaton 5P1550GR | New Eaton 5P 1U |
|---|---|---|
| Price | $174.99 | $289.99 |
| Condition | Used, light scuffs | New, factory sealed |
| Included extras | Lead-acid battery | DB9 serial adapter, front trim panel |
| Output capacity | 1550VA / 1100W | 1550VA / 1100W |
| Input voltage | 200-240V AC | 208/240V nominal, 200-240V compatible |
Where each product wins
The used Eaton 5P1550GR wins for budget-first buyers. It gets you the 1U rackmount form factor and the pure-sine-wave output you want from a UPS, and the included lead-acid battery means you don't have to source a battery separately. The physical trade-off is clear: the chassis shows light scratching and scuffing, and it was only verified to power on.
The new Eaton 5P 1U wins for anyone who needs a clean install. It arrives factory sealed with the DB9 serial adapter and front trim panel, and it supports 50/60 Hz frequencies with broad input tolerance. The high-efficiency mode is rated above 95%, which makes it a stronger fit for always-on rack equipment.
Product notes
Eaton 5P 1550VA 1100W 1U Rackmount UPS Pure Sine Wave 5P1550GR 200V-240V
This used option is the low-cost way into the Eaton 5P family. It still delivers 1550VA of capacity and 1100W of output, and the pure-sine-wave label means it's designed for sensitive electronics. The included lead-acid battery is a big plus, because you won't need to buy one before you can run a load test. The fair physical condition, with light scratching and scuffing, is fine if the unit lives inside a rack where nobody sees it. The bigger limitation is that it comes with no software, user guide, or accessory cables, and it was only verified to power on. If your rack already has management software and the right cables, that's not a dealbreaker; if you're starting from scratch, factor in those extras.
Eaton 5P 1U Rackmount 208V/240V 1550 VA/1100W Uninterruptible Power Supply UPS
This new unit is the set-and-forget pick. It's factory sealed in its original box, so the chassis is black and clean, and it includes the DB9 serial adapter and the plastic front trim panel. The six C13 outlets give you room for multiple devices, and the 50/60 Hz compatibility plus broad input tolerance makes it a strong fit for mixed-power environments. The high-efficiency mode, rated above 95%, matters if the UPS is going to carry equipment for extended periods. The trade-off is the price premium over the used unit. If your gear is mission-critical, that premium buys a factory-fresh unit with no unknown wear. If the UPS is for a lab or a secondary rack, the used unit may be enough.
Final choice by use case
For production hardware, a network closet, or any setup where downtime hurts, pick the new Eaton 5P 1U. For a homelab, test bench, or budget build, the used Eaton 5P1550GR is the smarter money move. Both carry the same 1U footprint and Eaton 5P engineering, so the decision comes down to how much a clean, complete, factory-sealed unit is worth to you.
