Vertiv Line Interactive UPS

About Vertiv Line Interactive UPS

What is Vertiv Liebert line-interactive UPS?

Line-interactive UPS keeps the load on utility power most of the time and uses an autotransformer with Automatic Voltage Regulation (AVR) to correct sustained low or high voltage without engaging the battery. On a true outage, transfer to battery is 2–4 ms — fast enough for any modern server, networking, or storage power supply. The right topology for the majority of SMB server, networking, and POS loads.

Vertiv's line-interactive line is the Liebert PSI5 — 750 VA to 3000 VA in 1U / 2U rack/tower. UPSPLUSBATTERY.CA stocks the PSI5 range with matching Liebert Vertiv replacement batteries. For loads that can't tolerate transfer time, see Vertiv double-conversion online UPS (GXT5). Full Vertiv catalog: Vertiv UPS.

Liebert PSI5 family

PSI5 covers most rack-level line-interactive deployments. Step up to GXT5 online for medical, VoIP, lab, or any zero-transfer requirement.

How to choose

Sizing

PSI5 at 0.9 PF — PSI5-1500RT120 delivers 1500 VA / 1350 W; PSI5-3000RT120 delivers 3000 VA / 2700 W. Add nameplate watts × 1.25 buffer, pick UPS whose watt rating exceeds. UPS sizing guide.

When to step up to online

Move to GXT5 online when load can't tolerate 2–4 ms transfer (medical, VoIP, precision lab), when galvanic isolation is required, or when utility frequency drift exceeds line-interactive AVR correction range. Line-interactive vs online UPS.

Spec reference

PSI5 ships with Vertiv Power Insight software for shutdown integration. IS-UNITY-DP card slot for network management.

Replacement batteries

PSI5 uses Vertiv-spec internal SLA cartridges. Cartridge spec is on the unit label and listed in the user manual. We stock compatible aftermarket cartridges — same V, Ah, terminal, connector spec as factory. 1-year UPSPLUSBATTERY warranty. Liebert Vertiv replacement batteries.

Installation and warranty

PSI5 1100 / 1500 / 2200: NEMA 5-15P plug-and-play. PSI5 3000: typically NEMA L5-30P. Warranty (USA and Canada): 2 years electronics + 2 years battery. Coordinated through our Canadian team. Shipped from our Canadian warehouse. Replies within 1 business day.

FAQ

PSI5 vs GXT5?

PSI5 is line-interactive (2–4 ms transfer, AVR). GXT5 is online (zero transfer, fully regenerated, unity PF on larger SKUs). Step up to GXT5 for medical, VoIP, lab, or any zero-transfer requirement.

Pure sine on battery?

Yes on every PSI5 SKU.

Network management?

IS-UNITY-DP card slot — SNMP, web, integration with Vertiv Power Insight, VMware, Hyper-V, Linux.

External battery packs?

Generally not on PSI5 — for extended runtime in similar VA range, step up to GXT5 with EBM support.

Hot-swap batteries?

Yes on PSI5 1500 / 2200 / 3000.

Battery life?

3–5 years SLA in 20–25 °C climate-controlled.

Canadian warranty?

Yes — Vertiv Liebert factory warranty covers Canada.