Quick verdict
When you need a rackmount unit for UPS critical power, the decision usually comes down to input voltage, available wattage, and the different price points of these two used units. The Eaton 5P 1550VA 1100W 1U fits 200-240V setups with a compact 1U chassis. The Libert Vertiv PSI5-1500RT120 covers 120V circuits and delivers more wattage for the lower price. Pure sine wave is not the dividing line here; voltage and load are.
At a glance
| Eaton 5P 1550VA | Libert Vertiv PSI5-1500RT120 | |
|---|---|---|
| Price | USD 174.99 | USD 149.99 |
| Price bar | ||
| Capacity | 1550VA / 1100W | 1500VA / 1350W |
| Input voltage | 200-240V AC | 100-125 VAC |
| Output voltage | 200/208/220/230/240V | 100/110/115/120/125V |
| Form factor | 1U rackmount | Rackmount/tower |
| Output waveform | Pure sine wave | Pure sine wave |
| Condition | Used | Used |
Where each product wins
Eaton 5P 1550VA wins if a compact 1U form factor is non-negotiable and you want a slightly higher VA rating. The included lead acid battery and C14 inlet make it a self-contained single-rack-unit option.
Libert Vertiv PSI5-1500RT120 wins if automatic voltage regulation and an LCD status display are on your must-have list, or if you want a rackmount/tower unit with greater continuous-wattage headroom.
Product notes
Eaton 5P 1550VA 1100W 1U
The Eaton 5P is a used 1U rackmount UPS from the 5P1550GR line. It includes a lead acid battery and a C14 inlet, so it can drop into a rack install as a self-contained battery backup. Choose it when a 1U footprint and a higher VA rating matter more than raw wattage. A slightly larger apparent-power buffer can help loads with demanding input stages. On the downside, this used unit shows light scratching and scuffing on the chassis, and the software, user guide, and accessory cables are not included. It powers on, but no further testing was done. If your rack space is tight, this is a workable pick despite the cosmetic wear.
Libert Vertiv PSI5-1500RT120 1500VA/1350W
The Libert Vertiv PSI5-1500RT120 is a used rackmount/tower UPS that comes from a working environment and is sold as a single unit. It stands out for its automatic voltage regulation and LCD status display, which make it easier to keep an eye on input and output conditions. It also gives you more load headroom for heavier draws. If you are consolidating a small stack of network equipment, that extra headroom gives you room to grow. The main drawback is its used condition: it was removed from service, so expect some wear from previous operation. It powers on and its LCD display works, but you should still plan a careful inspection before putting it into production.
Final choice by use case
- For a compact 1U install with broad input support: Eaton 5P 1550VA 1100W 1U.
- For a rack or tower setup with AVR and LCD: Libert Vertiv PSI5-1500RT120.
- For the lower price: Libert Vertiv, at USD 25.00 below the Eaton.
