Find the Right UPS Critical Power Unit for Your Rack: Used Options from $82.50 to $203.62

Choosing a rackmount UPS for critical power is about balancing capacity, battery status, and upfront cost. Used units can lower the entry price, but you need to know whether you are buying a chassis that needs batteries or a unit that arrives with them.

Quick take

Across these four listings, prices range from USD 82.50 to USD 203.62. The cheapest option is a 1U CyberPower without batteries, and the priciest is a 3000VA APC without batteries. Between them are two $149.99 units: one 800VA Vertiv Liebert with OEM batteries included, and one 1500VA/1350W Libert Vertiv with more capacity.

Listed price comparison

Decision matrix

Product notes

Vertiv Liebert PSI5-800RT120 - 800VA/720W 120V - OEM BATTERIES INCLUDED

This is the one listing that explicitly says OEM batteries are included, so you can start using it without an immediate battery search. At USD 149.99, it is in the middle of the price range. The listed specs include a rotatable LCD, surge protection, and an 8 A maximum input current. The trade-offs are that it is a used unit and the listing explains it is not covered by manufacturer warranties. With 800VA/720W capacity, it is best for a lighter rack load rather than high-draw equipment.

APC SRT3000RMXLA Smart-UPS SRT 3000VA Rackmount UPS (No Batteries

For USD 203.62, the APC gives you the largest capacity rating here: 3000VA and 2700W maximum in a 2U rackmount chassis. If your rack pulls a heavier load, this unit provides the most headroom. The catch is that it ships without batteries, so you need to source them before it can protect anything. The listing also notes the front bezel retaining clips are damaged and the rear USB port is defective, and the overall condition is used with cosmetic wear. It suits someone who wants the frame and capacity and is prepared to service it.

CyberPower OR500LCDRM1Ua 1U UPS System NO BATTERIES

At USD 82.50, the CyberPower is the cheapest path into a rackmount UPS. It is listed as a 1U unit, with an audible alarm, automatic voltage regulation, LED display, modular rack-mountable chassis, remote monitoring, surge protection, and a 15 A maximum input current. That is a strong feature set for the price. The limitation is that it does not include batteries, and the rack mounting brackets are not included either. The listing also says the power button cover does not fully close, so it is not a cosmetically perfect unit.

Libert Vertiv PSI5-1500RT120 1500VA/1350W Rackmount UPS Battery Backup Qty 1

This listing pairs a 1500VA/1350W rating with a USD 149.99 price, giving you considerably more capacity than the 800VA Vertiv Liebert at the same price. The description says the unit was pulled from a working environment, powered on properly, and passed a built-in self-test with no battery fault messages. It also lists a 100-125VAC input range, pure sine wave output, and automatic voltage regulation. The limitation is clear: it is a used unit sold as a single quantity, with prior service life. If you want a middle capacity step between 800VA and 3000VA, this is the pick.

Final recommendation by use case

For a space-conscious rack with your own batteries available, the CyberPower OR500LCDRM1Ua at USD 82.50 is the budget entry. For a ready-to-run unit, the Vertiv Liebert PSI5-800RT120 at USD 149.99 covers basic 800VA needs with batteries included. For the most capacity, the APC SRT3000RMXLA at USD 203.62 is the largest-capacity unit here, though it needs batteries. For a balance of capacity and price, the Libert Vertiv PSI5-1500RT120 at USD 149.99 is the strongest middle ground.