10 Best Uninterruptible Power Supplies 2026 in the United States
#1
Winner
Riello Guard Tower 10kVA / 10kW 208/240V Hardwired in/Out Online Tower UPS (GTT-10000)
The Riello Guard Tower GTT-10000 is a powerful uninterruptible power supply designed for demanding environments requiring up to 10,000 watts of continuous power. Its tower form factor and robust metal enclosure make it suitable for server rooms or critical equipment setups where stable power is essential. One standout feature is the high power rating (10kVA/10kW), which means it can handle large loads without strain. It supports a wide voltage range (208-240V) and works on a single-phase power supply, fitting many US facilities.
#2
Riello Guard Tower 6kVA / 6kW 208/240V Hardwired in/Out Online Tower UPS (GTT-6000)
The Riello Guard Tower 6kVA UPS is a powerful backup system designed for critical equipment needing consistent power, especially in business or industrial settings. It offers a strong 6000VA/6000W capacity, which means it can support a substantial load during outages. Its tower form factor is compact enough for server rooms or tech closets.
#3
LIEBERT PSI5 Lithium-ION 3000VA Short Depth 3U Rack/Tower UPS 120V
The Liebert Vertiv PSI5 Lithium-Ion UPS offers a strong power capacity of 3000VA/2700W, which is quite high for its compact 3U rack/tower design. This makes it a solid choice if you need reliable backup power for medium to large office setups or sensitive equipment that requires steady power without interruptions. Its lithium-ion batteries stand out by lasting up to three times longer than standard lead-acid batteries, meaning less frequent replacements and potentially lower long-term costs.
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Top 10 Best Uninterruptible Power Supplies 2026 in the United States
#1
Winner
Riello Guard Tower 10kVA / 10kW 208/240V Hardwired in/Out Online Tower UPS (GTT-10000)
Riello Guard Tower 10kVA / 10kW 208/240V Hardwired in/Out Online Tower UPS (GTT-10000)
Power Capacity (VA/W): 10,000 watts
Number of Outlets: 1
Form Factor: Tower
Additional Features: USB, RS-232, 2 Year Warranty
Chosen by 1418 this week
Riello Guard Tower 6kVA / 6kW 208/240V Hardwired in/Out Online Tower UPS (GTT-6000)
Riello Guard Tower 6kVA / 6kW 208/240V Hardwired in/Out Online Tower UPS (GTT-6000)
Power Capacity (VA/W): 6000VA/6000W
Number of Outlets: 1
Form Factor: Tower
Waveform Type: online double-conversion
Transfer Time: zero
LIEBERT PSI5 Lithium-ION 3000VA Short Depth 3U Rack/Tower UPS 120V
LIEBERT PSI5 Lithium-ION 3000VA Short Depth 3U Rack/Tower UPS 120V
Power Capacity (VA/W): 3000VA/2700W
Form Factor: 3U rack/tower
Additional Features: Lithium-ion battery, rack/tower, short-depth, 5-year warranty
Vertiv Liebert 3000VA 2700W 120V Rack Mount UPS PSI5-3000RT120
Vertiv Liebert 3000VA 2700W 120V Rack Mount UPS PSI5-3000RT120
Power Capacity (VA/W): 3000VA / 2700W
Battery Runtime: 3 minutes
Number of Outlets: 7
Form Factor: Rack/Tower
Waveform Type: Pure sine wave
Additional Features: Programmable outlets, AVR, Rotatable LCD, Cards
SolaHD SDU850B, Offline UPS, DIN Rail Mount, 850VA, 120V, 8A, Grey, Rack
SolaHD SDU850B, Offline UPS, DIN Rail Mount, 850VA, 120V, 8A, Grey, Rack
Power Capacity (VA/W): 850VA / 510W
Battery Runtime: 1 to 1.5 minutes
Number of Outlets: 1
Form Factor: DIN rail mounting
Transfer Time: slightly longer
Additional Features: offline UPS
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Riello - Sentinel SDH 3000RT - 3000VA/3000kW 120V Online Double Conversion Rack/Tower UPS
Riello - Sentinel SDH 3000RT - 3000VA/3000kW 120V Online Double Conversion Rack/Tower UPS
Power Capacity (VA/W): 3000VA/3000W
Number of Outlets: 7
Form Factor: Rack/tower
Waveform Type: online double conversion
Transfer Time: zero
Additional Features: multiple connection options, monitoring software
Riello Sentinel SDH 2000RT 2000VA/2000W 120V Online Double Conversion Rack/Tower UPS
Riello Sentinel SDH 2000RT 2000VA/2000W 120V Online Double Conversion Rack/Tower UPS
Power Capacity (VA/W): 2000VA/2000W
Number of Outlets: 8
Form Factor: Rack
Waveform Type: online double conversion
Additional Features: Lithium Ion battery, cables, quiet
#10
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Buying Guide for the Best Uninterruptible Power Supplies
Choosing the right uninterruptible power supply (UPS) is crucial to ensure that your electronic devices remain powered during outages and are protected from power surges. A UPS can be a lifesaver for both home and office environments, providing backup power and safeguarding your equipment. To make an informed decision, you need to understand the key specifications and how they align with your needs.Power Capacity (VA/W)Power capacity, measured in Volt-Amps (VA) and Watts (W), indicates the maximum load a UPS can handle. This spec is important because it determines how many devices you can connect to the UPS and how long they can run during a power outage. For small home setups, a UPS with a capacity of 600-1000 VA might be sufficient. For larger setups or small offices, you might need 1000-2000 VA. For enterprise environments, capacities above 2000 VA are often necessary. To pick the right one, calculate the total wattage of all devices you plan to connect and choose a UPS with a capacity that exceeds this total.
Battery RuntimeBattery runtime refers to how long the UPS can provide power to your devices during an outage. This is crucial for ensuring that you have enough time to save your work and safely shut down your equipment. Short runtimes (5-10 minutes) are suitable for brief outages or for giving you time to save your work. Medium runtimes (10-30 minutes) are better for longer outages or if you need more time to complete tasks. Long runtimes (30+ minutes) are ideal for critical systems that need to stay operational for extended periods. Choose a runtime based on how long you need your devices to stay powered during an outage.
Number of OutletsThe number of outlets on a UPS determines how many devices you can connect. This is important for ensuring that all your critical devices are protected and powered during an outage. For a small home setup, 4-6 outlets might be enough. For a larger home office or small business, 6-10 outlets could be necessary. For larger setups, more than 10 outlets might be required. Consider the number of devices you need to protect and choose a UPS with enough outlets to accommodate them.
Form FactorThe form factor of a UPS refers to its physical size and shape, which can affect where you can place it. This is important for ensuring that the UPS fits in your desired location. Desktop or tower UPS units are suitable for home or small office use where space is limited. Rack-mounted UPS units are designed for server rooms or data centers where they can be installed in standard equipment racks. Choose a form factor that fits your available space and installation preferences.
Waveform TypeThe waveform type of a UPS indicates the quality of the power it provides. This is important for ensuring compatibility with sensitive equipment. Simulated sine wave UPS units are generally sufficient for most home and office electronics. Pure sine wave UPS units provide higher quality power and are necessary for sensitive equipment like servers, medical devices, and high-end audio/video equipment. Choose a waveform type based on the sensitivity of the devices you need to protect.
Transfer TimeTransfer time is the duration it takes for the UPS to switch from mains power to battery power during an outage. This is important for ensuring that your devices experience minimal interruption. Short transfer times (2-4 milliseconds) are ideal for sensitive equipment that cannot tolerate power interruptions. Standard transfer times (4-8 milliseconds) are suitable for most home and office electronics. Choose a transfer time based on the sensitivity of your devices and how much interruption they can tolerate.
Additional FeaturesAdditional features such as LCD displays, USB charging ports, and network management capabilities can enhance the functionality of a UPS. These features are important for monitoring the status of the UPS, charging mobile devices, and managing the UPS remotely. Consider which additional features are important to you and choose a UPS that offers them. For example, an LCD display can provide real-time information about power status and battery life, while network management capabilities can be useful for managing multiple UPS units in a larger setup.