The decision: 208V/240V vs 120V in a 1U rack
For UPS critical power, the first fork in a rack is voltage, not battery size. Eaton offers two 1U rack UPS models that both output 1100W: the 208V/240V Eaton 5P1550GR and the 120V Eaton 5P1500R. They are not interchangeable. The higher-voltage unit is new and has six C13 outlets; the 120V unit is used and has five 5-15R outlets. With a USD 50.09 gap between them, your choice comes down to rack voltage, outlet style, and condition.
Quick verdict
Pick the Eaton 5P1550GR if your rack is wired for 208V/240V and you want a new unit with C13 outlets. Pick the Eaton 5P1500R if your equipment runs on 120V and you want the same 1100W output with a USD 50.09 lower listed price, accepting used condition.
Side-by-side comparison
| Eaton 5P1550GR 208V/240V | Eaton 5P1500R 120V | |
|---|---|---|
| Listed price | USD 289.99 | USD 239.90 |
| Condition | New | Used |
| VA rating | 1550 VA | 1440 VA |
| Output wattage | 1100 W | 1100 W |
| Voltage | 208V/240V, 230V default | 120V |
| Outlets | 6 x C13 | 5 x 5-15R |
| Rack form | 1U | 1U |
Even though the VA ratings differ, both units share the same 1100W output, so neither gives you more usable wattage. The real differentiator is which voltage and outlet type your equipment accepts.
Where each product wins
- The Eaton 5P1550GR wins for higher-voltage racks, new condition, and six C13 outlets.
- The Eaton 5P1500R wins for 120V racks and standard 5-15R outlets.
Both are Eaton 5P units in a 1U rack form, so the distinction is not power capacity. It is the electrical environment around them.
Product notes
Eaton 5P 1U Rackmount 208V/240V 1550 VA/1100W Uninterruptible Power Supply UPS
This higher-voltage Eaton 5P 1U model is the new-box choice for racks that run at 208V/240V. It delivers 1550 VA and 1100W through six C13 outlets, and its 230V default with 200-240V compatibility suits equipment that expects IEC-style power. The included DB9 serial adapter and plastic front trim panel are useful extras for a managed rack. The limitation is fit: this is not a 120V machine, so it won't replace a standard 120V UPS without a voltage change. It also carries the higher listed price of the pair, which matters if your equipment already runs on 120V and you simply need battery backup. If your rack is already 208V/240V, the new condition and six C13 outlets make the higher price easy to justify.
Eaton 5P1500R 5P 1U 120V Rack UPS Battery Back Up 1440 VA 1100W 5 Outputs
The 120V option takes a different route to the same 1100W output. Its five 5-15R outlets plug directly into typical 120V equipment, and its 1440 VA rating covers standard rack loads. This used Eaton 5P1500R has been tested and holds a good charge, and a 30-day warranty is included, so there is some protection despite the pre-owned status. The trade-off is condition: it shows scuffs and scratches from storage and regular use. If your rack runs on 120V and cosmetics are secondary, this model gives you the 1U backup form without forcing a voltage change.
Final choice by use case
Choose the Eaton 5P1550GR when your rack runs on 208V/240V and you want new condition and C13 outlets. Choose the Eaton 5P1500R when your rack runs on 120V and you want standard 5-15R outlets, accepting used condition. The same 1100W output on both sides means the decision is voltage, outlet type, and condition - not raw capacity.
