When your rack is full of network switches, servers, or AV processors, a power blip isn't an inconvenience - it's a potential crash. In the UPS critical power category, a 1500VA rackmount UPS gives you the runtime to shut down cleanly or ride through short outages. You're probably looking at two strong but very different candidates: the Libert Vertiv PSI5-1500RT120 at $149.99 and the W Box Technologies OE-RCKMT1500 at $420.00. Both are 1500VA, but one delivers more watts, one comes with a far lower price, and one is used while the other is open-box new. Here's how to decide without losing power protection.
Quick Verdict
Choose the Libert Vertiv if you want maximum output capacity (1350W) for the least money and are comfortable with a used commercial-grade unit that has been through a working environment. Choose the W Box Technologies if you prefer a new, unused unit and your rack draws less than 1050W.
Comparison
| Feature | Libert Vertiv PSI5-1500RT120 | W Box Technologies OE-RCKMT1500 |
|---|---|---|
| Price | $149.99 | $420.00 |
| VA / Watts | 1500VA / 1350W | 1500VA / 1050W |
| Condition | Used | New - Open Box |
| Relative Price |
Where Each Product Wins
The Libert Vertiv wins on price per watt by a wide margin. You're getting 1350W of capacity for $149.99, and the unit has been individually tested, with a fully functional LCD display and a passing self-test. The W Box wins on being new and unused - opened only to verify contents - and it spells out a 15A inrush current rating and eight surge-plus-battery outlets, which makes planning your connections easier. You're paying more for a clean, unused unit with a lower output ceiling.
Product Notes
Libert Vertiv PSI5-1500RT120
This used enterprise UPS is the power player of the pair. At 1500VA / 1350W, it has more continuous wattage than its open-box rival - an advantage if you're running blade servers or a power-hungry network stack. It was recently pulled from a working environment, individually tested, and passed its built-in self-test with the LCD confirmed functional. For $270.01 less than the W Box unit, you get 300W more capacity. The tradeoff is that you're buying gear with a service history, so it won't have the untouched, brand-new feel. If you're on a tighter budget and don't mind a used unit that has been verified to power on and hold a charge, this is the one that stretches your dollar.
W Box Technologies OE-RCKMT1500
If "open-box new" is your comfort zone, this W Box Technologies unit is the cleaner slate. It's new and unused, with the original packaging opened only to confirm contents and rackmount ears, so every accessory is accounted for. It's rated at 1500VA / 1050W, which is plenty for typical switches, routers, NAS units, and AV components under 1000W. The 2U rackmount/tower convertible format fits a variety of racks, and the integrated LCD gives you a clear view of load and battery status. The catch is the price: $420.00 buys you 300W less capacity than the Libert Vertiv, and for the $270.01 price gap, you're paying primarily for the new condition and the convenience of knowing exactly how many outlets are available. If your load is modest and a new unit matters more than maximum headroom, this is the one.
Final Choice by Use Case
If your equipment list pulls more than 1050W, stop here - the Libert Vertiv is the only realistic choice because it delivers 1350W. If you're under 1050W and you want a brand-new unit without the "used enterprise gear" asterisk, the W Box Technologies is worth the extra money. And if you simply want the lowest possible entry price for solid 1500VA protection, the Libert Vertiv wins outright.
