How do the input tolerance, output power, and waveform specs compare between these two UPS units?

The SRT6KRMXLI accepts input voltages from 100 V to 275 V across a 40–70 Hz frequency range, making it tolerant of wide utility-voltage swings commonly seen in international or aging-infrastructure environments. Its output delivers 6000 VA / 6000 W at 220–240 V with a 50/60 Hz regulated sine wave and a crest factor of 3:1, which accommodates non-linear loads such as switched-mode power supplies.

The GXT5LI-6000GVRT3UXLN is specified for a narrower 200–240 V input band and uses a hardwired input connection (L1-L2/N-G wiring), meaning it cannot be plugged into a standard outlet—installation requires a licensed electrician and a dedicated circuit. Its output is 200–240 VAC user-configurable (default 230 VAC) with ±1% voltage regulation. No input frequency range, crest factor, or surge energy rating is listed in the provided specs for the Vertiv unit.

The APC unit's wider input window (100–275 V) gives it a meaningful advantage in environments with unstable utility power. The Vertiv's ±1% output voltage regulation is a notable precision figure, but APC's input frequency flexibility (40–70 Hz) is not matched by a published equivalent for the GXT5LI-6000GVRT3UXLN.

What does each unit's battery chemistry and efficiency spec mean for total cost of ownership and maintenance burden?

The Vertiv GXT5LI-6000GVRT3UXLN uses lithium-ion (LI) battery technology, as indicated explicitly in the product name and SKU. Lithium-ion cells carry well-documented advantages over traditional VRLA: longer calendar life (typically 8–10 years vs. 3–5 years for VRLA), lighter weight per equivalent capacity, tolerance of higher ambient temperatures, and reduced replacement frequency. No battery runtime, battery capacity (Ah or kWh), or replacement-cost figures are provided in the supplied specs for either unit.

The SRT6KRMXLI does not specify its battery chemistry in the provided specs. APC Smart-UPS SRT-series units are conventionally available with VRLA or lithium-ion battery configurations depending on the specific SKU variant, but the specs supplied here do not confirm which chemistry applies. Buyers must verify this directly from the product datasheet or seller.

The SRT6KRMXLI publishes an efficiency figure of 94.4% in online (double-conversion) mode. No equivalent efficiency figure is listed for the GXT5LI-6000GVRT3UXLN in the provided specs. Over a year of continuous operation at full load, a 94.4% efficiency means roughly 5.6% of input power is lost as heat—relevant for both energy cost and cooling load calculations. The absence of an efficiency figure for the Vertiv makes a direct numerical comparison impossible from these specs alone.

How do the physical footprint, installation requirements, and operating environment specs differ between the two units?

The GXT5LI-6000GVRT3UXLN has documented physical dimensions: 5.25 in H × 16.9 in W × 35 in D, weighing 99 lbs. The 5.25 in height corresponds to a 3U rack form factor. Its hardwired input requirement (L1-L2/N-G) means physical installation is more involved than a plug-in unit and typically requires conduit and a dedicated breaker. Operating temperature is specified at 32°F–104°F (0°C–40°C) with a 10% derating at 50°C.

The SRT6KRMXLI's physical dimensions and weight are not provided in the supplied specs. It is designated as a rack-mount ('RM') unit, but rack unit height, depth, and shipping or unit weight cannot be confirmed from the data provided. No operating temperature range is listed for the APC unit in these specs.

The Vertiv unit carries documented agency approvals: IEC 62040-1:2008+A1 2013, IEC 62619 1st Ed., IEC 62040-2 2nd Ed., IEC 61000-3-2, IEC 61000-3-12, CISPR 22 Class A, FCC Part 15 Class A, and UL 1778. No agency certifications are listed in the provided specs for the SRT6KRMXLI. The APC unit does list an audible alarm, Emergency Power Off (EPO) capability, and a noise level of 55 dB; none of these are spec-confirmed for the Vertiv unit.

Which should you choose: the SRT6KRMXLI or the GXT5LI-6000GVRT3UXLN?

Our take: The GXT5LI-6000GVRT3UXLN is the stronger choice when lithium-ion battery longevity, confirmed agency certifications, and precise output voltage regulation (±1%) are primary requirements. The SRT6KRMXLI is the stronger choice when wide input voltage tolerance (100–275 V vs. 200–240 V), plug-in rather than hardwired installation, and a published efficiency figure (94.4%) are decision drivers. Three concrete spec deltas: (1) input voltage range is 175 V wider on the APC unit; (2) only the Vertiv publishes physical dimensions and weight (99 lbs, 3U, 35 in deep); (3) only the APC unit publishes an efficiency rating (94.4%) and surge energy rating (480 J). For international deployments or sites with unstable utility power, the APC's broader input window is a decisive advantage. For new data center builds requiring documented compliance certifications and reduced battery-replacement intervals, the Vertiv's lithium-ion chemistry and UL 1778 / IEC 62040 listings carry meaningful weight.

Side-by-Side Comparison

Spec-for-spec, from manufacturer data.

Frequently Asked Questions

Related Resources

• APC by Schneider Electric SRT6KRMXLI product page — full specs and to add to a quote
• Vertiv GXT5LI-6000GVRT3UXLN product page — full specs and to add to a quote