About this UPS
The Vertiv Liebert PSI5 UPS PSI5-1500RT120 is a 1500VA / 1350W tower/rack convertible line-interactive UPS. Designed for business-critical power protection, it delivers clean, regulated output to protect servers, network equipment, workstations, and other sensitive electronics from power disturbances.
Specifications
| Output Capacity (VA) | 1500 VA |
| Output Power (Watts) | 1350 W |
| Topology | Line-Interactive |
| Output Waveform | Pure Sine Wave |
| Output Voltage | 100V |
| Input Plug | NEMA 5-15P |
| Outlets | 6 × NEMA 5-15R |
| Form Factor | Tower/Rack Convertible |
| Communications | USB |
| Weight | 19.32 kg (42.6 lb) |
| Manufacturer Part Number | PSI5-1500RT120 |
Technical specifications
Setup checklist: after you receive your UPS →
How long it'll keep your equipment up.
Manufacturer-specified runtime at typical loads. Real-world figures depend on battery age, ambient temperature, and load profile.
Need more runtime? This UPS accepts external battery packs (XBPs). Contact us about XBP options →
Compare with alternatives
The PSI5-1500RT120 side by side with UPS from other makers.
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Xtreme Power Conversion
Xtreme Power P80-1500 1500 VA / 1350 W Line-Interactive UPS, 120 V
Compared with PSI5-1500RT120 Spec PSI5-1500RT120 Xtreme Power Capacity 1440 VA / 1350 W 1500 VA / 1350 W Topology Line-Interactive Line-Interactive Form Tower/Rack Convertible, 2U Tower/Rack Convertible, 2U Input plug NEMA 5-15P NEMA 5-15P Outlets 6 × NEMA 5-15R 8 × NEMA 5-15/20R Runtime, half load 18 min 18 min Same class on every point compared.
$1,443.31 -
Compared with PSI5-1500RT120 Spec PSI5-1500RT120 Delta Capacity 1440 VA / 1350 W 1500 VA / 1350 W Topology Line-Interactive Online Double-Conversion Form Tower/Rack Convertible, 2U Tower/Rack Convertible, 2U Input plug NEMA 5-15P NEMA 5-15P Outlets 6 × NEMA 5-15R 8 × NEMA 5-15R Runtime, half load 18 min 10 min Differences
- Online double-conversion, a step up from line-interactive
$2,073.99 -
Xtreme Power Conversion
Xtreme Power P91-1500 1500 VA / 1450 W Online UPS, 120 V
Compared with PSI5-1500RT120 Spec PSI5-1500RT120 Xtreme Power Capacity 1440 VA / 1350 W 1500 VA / 1450 W Topology Line-Interactive Online Double-Conversion Form Tower/Rack Convertible, 2U Tower/Rack Convertible, 2U Input plug NEMA 5-15P NEMA 5-15P Outlets 6 × NEMA 5-15R 8 × NEMA 5-15R Runtime, half load 18 min 10 min Differences
- Online double-conversion, a step up from line-interactive
$1,812.76
Check outlets and the runtime your load needs before ordering. Questions? Call 438-881-3363 or ask for a quote.
Works with this UPS
Only accessories the manufacturer lists for this model.
Replacement batteries that fit this exact UPS
A line-interactive UPS typically needs new batteries every 3 to 5 years. Matching replacement cartridges are listed by UPS model; confirm the exact model before ordering.
Questions before you buy
How do I know this UPS will run my equipment?
Add up the wattage draw of every device you'll plug in (servers, switches, monitors). The UPS's wattage rating (not VA) is the number that matters. Aim for the UPS to run at 60 to 70% of capacity at full load: this gives headroom for inrush current and a meaningful runtime margin. Email us your equipment list; we'll respond within one business day with sizing guidance.
What's covered by the warranty, and how long does it last?
New units carry the warranty coverage stated by the manufacturer; see the product listing or manufacturer documentation for the applicable terms. Refurbished units are covered by the 1-year UPSPLUSBATTERY warranty handled in Canada.
Can I extend runtime beyond what's shown above?
Many Smart-UPS-class models accept an external battery pack (XBP) connected to the rear battery port. If this UPS shows "Extended Runtime Capable: Yes" in the spec grid above, an XBP is supported. Compatible XBPs and the runtime gain they deliver vary by model; contact us if you don't see the right XBP in our catalogue.












