When the power flickers, a UPS can be the difference between riding through an outage and losing your work. A backup battery only helps if it can carry the connected load long enough for you to shut down cleanly. For critical power protection, the right battery backup depends on the size of your load, how many devices you need to keep online, and where the unit will live. The APC Back-Ups PRO 1000 BR1000G and the Libert Vertiv PSI5-1500RT120 sit at two different points in that decision. The APC is the outlet-focused option; the Vertiv is built for more demanding loads.
Quick verdict
If you need more power headroom and a form factor suited to cabinet installs, choose the Libert Vertiv PSI5-1500RT120. If you need to keep multiple devices plugged in at once, choose the APC Back-Ups PRO 1000 BR1000G. The table below puts the key details side by side.
Side-by-side comparison
| Product | Price | Condition | What you get | Best for |
|---|---|---|---|---|
| Libert Vertiv PSI5-1500RT120 | $149.99 | Used | 1500VA / 1350W, rackmount | Rack installations and heavier loads |
| APC Back-Ups PRO 1000 BR1000G | $64.99 | Used | 8 outlets, battery carrier | Multi-device workstation |
Where each product wins
The Libert Vertiv PSI5-1500RT120 wins for heavier loads and cleaner output. The extra headroom helps before the battery takes over, and stable output supports equipment that is sensitive to voltage swings. The APC Back-Ups PRO 1000 BR1000G wins for spreading devices across one UPS. With more connections available, you can group your network gear and computer together. If your priority is handling heavier gear, the Vertiv is the stronger fit; if your priority is convenient multi-device coverage, the APC is the one.
Product notes
Libert Vertiv PSI5-1500RT120 1500VA/1350W Rackmount UPS
This is the higher-capacity unit of the pair. It carries a stated 1500VA / 1350W rating, which gives you more headroom to protect several devices or a heavier network load. The LCD status display lets you check the UPS at a glance, while pure sine wave output and automatic voltage regulation support sensitive electronics that need stable power. The unit came out of a working environment and passed its built-in self-test, which helps when you are considering a used backup. The tradeoff is the higher asking price and the used condition. If your setup doesn't need that extra headroom, you may pay for capacity you don't use.
APC Back-Ups PRO 1000 BR1000G 8 Outlets UPS
The APC is the lower-priced option in this head-to-head, and its eight outlets are the standout practical feature. You can plug in a modem, router, desktop, and monitor from one unit, which is a real convenience for a small workstation. The battery carrier is part of the package, so you have a dedicated housing for the battery rather than a bare internal connection. Because this is a used unit, the backup battery's condition is the main thing to weigh before relying on it for extended outages. For modest loads, it may be all you need, and the lower asking price leaves room for other gear.
Final choice by use case
Pick the Libert Vertiv PSI5-1500RT120 for heavier loads and stable output. Pick the APC Back-Ups PRO 1000 BR1000G for a compact workstation and multi-device convenience. If you are protecting just a modem, router, and one computer, the APC is likely plenty. If you have several heavier devices or want room to grow, the Vertiv is the one to reach for. No single unit is right for every room; these two simply serve different needs.
