P91-3kLi vs APC SMTL3000RM2UCNC
The P91-3kLi is an online double-conversion lithium rack UPS positioned as an alternative to the line-interactive APC SMTL3000RM2UCNC. At equivalent 3 kVA power, the P91-3kLi provides nearly double the full-load runtime, much lighter installed weight, shorter depth, and LiFePO₄ lifecycle value.
What the P91-3kLi brings
- Online double-conversion with zero transfer time
- LiFePO₄ chemistry, up to 15-year design life
- Nearly double runtime at full load (10 min vs 5 min 18 s)
- Much lighter (45 lb vs 75 lb)
- Shorter rack depth (23.8 in vs 26.9 in)
- TAA compliance and a 6-year warranty
Side-by-side specifications
| Specification | Xtreme Power P91-3kLi | APC SMTL3000RM2UCNC | Advantage |
|---|---|---|---|
| Battery chemistry | LiFePO₄ | Lithium-ion | P91 – longer life, thermal stability |
| Battery life | Up to 15 yr / 3,000–5,000 cycles | 8–10 years typical | P91 – reduced maintenance |
| Topology | Online double-conversion | Line-interactive | P91 – zero transfer time |
| Capacity | 3000 VA / 2700 W | 3000 VA / 2700 W | Equivalent real power |
| Runtime (full load) | 10 min | 5 min 18 s | P91 – longer runtime |
| Operating temperature | Up to 50°C | Rated to 40°C | P91 – higher thermal tolerance |
| Rack height / depth | 2U / 23.8 in | 2U / 26.9 in | P91 – shorter depth |
| System weight | 45 lb | 75 lb | P91 – much lighter |
| Monitoring | Optional Web/SNMP | Integrated network management | APC – integrated by default |
| Maintenance | Minimal battery replacement | Periodic replacement | P91 – lower lifecycle cost |
| TAA compliance | Yes | No | P91 – federal procurement |
| Warranty | 6-year UPS & battery | 5-year typical | P91 – longer coverage |
Specifications from Xtreme Power’s supplied P91-3kLi vs APC SMTL3000RM2UCNC comparison, based on publicly available manufacturer data; confirm against current vendor documentation.
Choosing between them
Equivalent rated power. The P91-3kLi leads strongly on runtime, weight, depth, temperature, lifecycle/maintenance, and TAA; the APC includes integrated network management by default.
Choose the P91-3kLi if you need
- Server and network racks needing longer runtime
- Edge and distributed IT with reduced maintenance
- Zero transfer time and lighter installs
- Government / regulated procurement requiring TAA
The SMTL3000RM2UCNC may fit if you need
- General IT tolerant of line-interactive transfer time
- Integrated network management out of the box
- Sites standardized on APC lithium Smart-UPS
Related comparisons
Standardizing on lithium rack UPS?
Xtreme Power supports UPS selection, lifecycle planning, and distributed infrastructure design for lithium rack UPS across IT, networking, and regulated environments.