10 Best Uninterruptible Power Supplies 2025 in the United States

The EF ECOFLOW River 3 Plus is a compact and portable uninterruptible power supply (UPS) designed to protect home offices, gaming setups, and other sensitive electronics from power interruptions with a very fast transfer time of under 10 milliseconds. It delivers a steady 600W output and can briefly surge up to 1200W, which is enough for many small to medium devices. Its battery capacity starts at 286Wh and can be expanded up to 858Wh by adding the EB600 extra battery, giving you flexibility depending on how long you need backup power.

The device is lightweight (around 9.4 pounds) and quiet, running at about 30 decibels, so it won’t cause noise distractions. It also supports fast recharging via AC power in just one hour or solar panels in about 1.5 hours, making it versatile for both indoor and outdoor use. With seven outlets including AC, USB-A, USB-C, and a car charger, it covers various device types, while the LiFePO4 battery promises a long lifespan of up to 3000 charge cycles, roughly 10 years of typical use. The UPS also connects to a smartphone app for easy monitoring and control remotely, which adds convenience.

While it is suitable for protecting and powering smaller electronics and some appliances under 100W for extended periods, it might not be appropriate for high-power devices or long-term blackout scenarios without additional batteries. It is not designed for heavy industrial or whole-house backup needs. This UPS is ideal for users seeking reliable, quiet, and portable backup power with smart features, particularly in home or light outdoor environments.

The Amazon Basics UPS Battery Backup & Surge Protector offers a total power capacity of 400VA/255W, making it suitable for home networks, IoT devices, and home entertainment systems. With six outlets, it provides a good mix of surge protection and battery backup, ensuring your devices are safeguarded during power surges and remain operational during short outages.

Its small, compact design allows for easy integration into any home or office environment, and the 5-foot cord with a right-angle plug adds to its convenience. Users should be mindful of not exceeding 80% of the unit's rated capacity to maintain optimal performance. This UPS falls under the standby category, which is typically more budget-friendly but may not offer as seamless a transition as more advanced models.

The product comes with power management software, which is a helpful feature for monitoring and managing power usage. This UPS is best for those needing basic protection and short-term power backup for smaller devices.

The Amazon Basics UPS Battery Backup & Surge Protector provides 600VA/360W of power, making it a solid choice for home or small office use. Its power capacity is suitable for desktop computers, home networks, and entertainment systems, though it won't support heavy-duty equipment. With 8 outlets—4 surge-protected and 4 with both surge protection and battery backup—this UPS can accommodate several devices, offering basic protection against power surges and outages.

The compact design is a practical feature, allowing easy integration into tight spaces, and the 5-foot cord with a right-angle plug adds flexibility in placement. The standby UPS design means it provides power swiftly during outages, with enough battery runtime to safely shut down devices during longer interruptions. However, this type is generally not as efficient as line-interactive or online UPS systems for continuous power regulation.

Transfer time is an essential factor to consider as this UPS might not be ideal for very sensitive electronics needing immediate power continuity. The waveform type is not specifically mentioned, but typically, standby units like this provide a simulated sine wave, which might not be suitable for certain sensitive electronics, particularly those requiring a pure sine wave. The power management software is a helpful addition, giving more control over the UPS system and prolonging battery life. It's crucial to ensure that the load is kept below 80% of its capacity for optimal performance.

This UPS provides a decent balance of functionality and price for those needing basic power protection and battery backup, with the major strengths being its compact size, affordability, and sufficient outlets. However, its limitations in power capacity and waveform type might be a downside for users with more sensitive equipment or higher power needs.