• List all devices requiring power saving
• Enter the wattage for each device (found on device labels or in manuals)
• Set the amount for each device type

2. UPS Configuration

• Select your regional voltage standard (110V, 220V, 240V)
• Set power factor (typically 0.6-0.8 for modern equipment)
• Specify efficiency rating (85-95%)
• Input expected runtime during power outages
• Select battery voltage configuration (12V/24V/48V)

3. Review Results

• Total wattage consumption
• Recommended UPS VA rating
• Required battery capacity (Ah)
• Estimated runtime

How It Works

The UPS Load Calculator uses advanced formulas to determine the optimal UPS size and battery capacity. Here’s how it works:

• Total Wattage: Sum of the wattage of all connected devices.
• VA Rating: Calculated by dividing the total wattage by the power factor and adding a 25% safety margin.
• Battery Capacity: Defined based on the preferred runtime, battery voltage, and efficiency factor.
• Runtime Estimation: Calculated using the battery capacity and total load.

Example

Home Office Setup:

• Desktop Computer (150W)
• Monitor (30W)
• Network Router (20W)
• External Hard Drive (10W)

Calculation:

• Total Wattage: 150W + 30W + 20W + 10W = 210W
• With a Power Factor of 0.7: 210W ÷ 0.7 = 300VA
• Adding 25% Safety Margin: 300VA × 1.25 = 375VA
• For 15-minute runtime with 12V battery: (210W × 15 min) ÷ (12V × 0.9 efficiency) ≈ 29.2Ah

Recommendation: A 400VA UPS with 30Ah battery capacity would be suitable for this setup.

Why Use a UPS Load Calculator?

• Prevent Underprotection: Ensure your UPS can handle peak loads without overloading.
• Avoid Overspending: Don’t waste money on unnecessarily large UPS systems
• Runtime Planning: Match battery capacity to your specific backup time needs
• Simplified Decision-Making: Stop guesswork when buying a UPS

Using this UPS Load Calculator lets you make knowledgeable judgments about your power protection needs.