CyberPower ST900U

Overview

The CyberPower ST900U is a standby uninterruptible power supply designed to protect your essential electronics from power interruptions and surges. It provides 900 VA and 500 watts of power capacity, enough to keep critical devices running briefly or allow safe shutdown during outages. With 12 outlets—six offering battery backup and surge protection, and six providing surge protection only—this UPS fits well in home offices, media centers, and small business environments. Its compact and quiet design ensures it won’t disrupt your workspace, while two USB-A ports with a combined 2.1A output offer convenient charging for mobile devices.

Key features

• Provides battery backup and surge protection for critical devices through six dedicated outlets
• Additional six outlets offer surge protection for less critical equipment, safeguarding your entire setup
• 890-joule surge protection rating defends against damaging power spikes common in unstable electrical environments
• Two USB-A ports with 2.1A shared output allow charging of smartphones, tablets, and other USB-powered devices without extra adapters
• ENERGY STAR certification ensures energy-efficient operation, helping reduce electricity costs
• Includes PowerPanel Personal Software for real-time power monitoring and automated safe shutdowns from your computer
• Compact and quiet design fits seamlessly into home or office spaces without adding noise or clutter
• Full-load runtime of up to 2 minutes provides enough time to save work and power down devices safely during outages
• $125,000 connected equipment guarantee offers added peace of mind against equipment damage
• Three-year limited warranty reflects CyberPower’s commitment to long-term reliability

Key specs

• Power capacity: 900 VA / 500 watts
• Outlets: 12 total; 6 with battery backup and surge protection, 6 with surge protection only
• Surge protection rating: 890 joules
• USB ports: 2 USB-A ports with combined 2.1A output
• Runtime at full load: up to 2 minutes
• Certification: ENERGY STAR certified
• Warranty: three-year limited warranty
• Connected equipment guarantee: $125,000

Connectivity and compatibility

This UPS supports a wide range of devices commonly found in home and office setups. The six battery backup outlets are ideal for computers, routers, modems, and entertainment systems that require uninterrupted power. The additional six surge-only outlets protect printers, monitors, and other peripherals that do not need battery backup but still benefit from surge protection. The two USB-A ports provide a convenient way to charge mobile devices without occupying the main outlets or requiring separate chargers.

Ideal uses and environments

The CyberPower ST900U is well suited to home offices, small business workstations, and media centers where protecting sensitive electronics from power interruptions is critical. Its power capacity and outlet configuration make it a strong choice for users who need to safeguard computers and networking equipment while also protecting additional devices from surges. The compact and quiet design ensures it fits naturally into environments where space and noise levels matter.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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