P91-1kLi: 1000 VA Short-Depth Online Lithium UPS
Online double-conversion lithium protection in a rack depth most 1 kVA online UPS can’t reach. The P91-1kLi needs 10.6 inches behind the front rail, where comparable 1 kVA online models run 17 inches or more, so it fits wall-mount cabinets, shallow IDF racks and AV credenzas.
LiFePO₄ batteries rated for up to 15 years, 3 to 4 times the life of lead acid, in the same 2U rack/tower platform as the rest of the P91 Li family.
Why the P91-1kLi stands out
10.6 inches of rack depth with online double conversion. APC’s short-depth lithium model at 1 kVA is line-interactive.
Up to 15-year design life and 3,000–5,000 charge cycles, 3 to 4 times longer than lead acid.
Operates up to 50 °C (122 °F), suited to closets and cabinets without dedicated cooling.
Eight NEMA 5-15R receptacles, including a controllable bank of four for load shedding or remote reboot of that group.
Rack mounts with the optional 4-post rail kit, or stands as a tower.
Optional Web/SNMP card for alarms, logging and remote output control; RS-232, USB and EPO standard.
Electronics and lithium battery (USA and Canada). Reduced to 2 years in 40–50 °C environments; 2 years depot repair elsewhere.
Connected equipment is covered up to $50,000 in the USA and Canada. Register within 10 days.
Qualifies for U.S. government, education and public-sector procurement.
Short-depth 1 kVA, without giving up online protection
At 1 kVA, buyers with shallow racks often end up choosing between a short-depth line-interactive lithium UPS and a full-depth online one. The P91-1kLi is both short-depth and online.
Where the P91-1kLi leads: online double conversion at 10.6 inches of rack depth, a 6-year full warranty (the APC and Vertiv models are 5 years, the Eaton 3), eight outlets, TAA compliance, and a $50,000 connected-equipment load protection policy.
P91-1kLi at a glance
View the P91 Li datasheet » Full P91 Li specifications and runtimes »
How the P91-1kLi compares at 1 kVA
| Feature | Xtreme P91-1kLi | APC SMTL1000RM2UCNC | Vertiv GXT5LI-1000LVRT2UXL | Eaton 9PX1000RT |
|---|---|---|---|---|
| Depth | 10.6″ rack (11.6″ with bezel) | 12.5″ | 17.3″ | 17.7″ |
| Topology | Online double-conversion | Line-interactive | Online double-conversion | Online double-conversion |
| Output capacity | 1000 VA / 900 W | 1000 VA / 800 W | 1000 VA / 1000 W | 1000 VA / 900 W |
| Battery | LiFePO₄ (LFP) | Lithium-ion | Lithium-ion | Lead acid |
| Outlets | 8 × 5-15R | 6 × 5-15R | 6 × 5-15R | 8 × 5-15R |
| Warranty | 6-year full | 5-year | 5-year | 3-year |
APC, Vertiv and Eaton are trademarks of their respective owners and are referenced here for factual comparison only. Competitor specifications are based on published manufacturer and distributor data and are subject to change; verify current figures before purchase. Competitor depths are as published. Eaton’s lithium 9PX models start at 1500 VA, so the 1000 VA 9PX shown uses lead-acid batteries. Competitor data checked October 2026.
Full head-to-head: P91-1kLi vs APC SMTL1000RM2UCNC »
See detailed head-to-head comparisons →Where the P91-1kLi fits
Working in a shallow space? See every option by depth on the short depth rack UPS page. Need more capacity? See the P91-2kLi 2000 VA comparison.
P91-1kLi: frequently asked questions
How deep is the P91-1kLi?
Is the P91-1kLi a true online UPS?
How much runtime does the P91-1kLi give?
When does the P91-1kLi ship?
Will it fit a wall-mount cabinet?
Is the P91-1kLi TAA compliant?
What warranty and protection come with it?
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