4 hours uninterrupted power supply

Uninterruptible Power Supply hours refer to the duration a UPS can sustain power to connected devices during an outage. This time can vary widely based on several factors, including battery capacity, load requirements, and the UPS's efficiency. Knowing how to calculate this can help you select the right UPS for your needs.

Calculate the appropriate uninterruptible power supply (UPS) size by entering your equipment power requirements and backup needs below. This calculator helps determine the correct UPS capacity in VA (Volt-Amps) and required battery runtime based on your connected load and desired backup duration.

If you have important electronics that have to keep running when the power's out, you'll need an uninterruptible power supply (UPS). We've reviewed our recommendations and are confident these are still the best UPS devices you can buy. Many smart devices have built-in battery packs, with modern laptops packing enough cells to last a whole day.

The power consumption is typically measured in watts (W) or kilowatts (kW). Example: If you have a server that consumes 500W, this is the load that your UPS will need to support. Next, you need to identify the capacity of your UPS. This is usually given in volt-amperes (VA) or kilovolt-amperes (kVA).

Formula: Load Ratio = (Total Power Consumption / UPS Real Power Capacity) * 100% Example: For a 500W server and an 1000W UPS, the load ratio is (500W / 1000W) * 100% = 50%. Battery runtime is the amount of time your UPS can provide power during an outage. This is usually expressed in watt-hours (Wh) or amp-hours (Ah).

Maintain UPS reliability through: Optimize UPS energy usage by: Calculate the correct UPS size with our UPS Size Calculator. Get accurate UPS sizing recommendations based on load requirements, runtime needs, and power conditions.