1. What is UPS Battery Run Time?

The UPS battery run time is the duration a UPS (Uninterruptible Power Supply) can power connected equipment at a specific load level when main power is lost. This calculation helps determine how long critical systems will remain operational during a power outage.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Battery Capacity — Total amp-hour rating of the battery
• Voltage — System voltage (typically 12V, 24V, or 48V for UPS systems)
• MPH Load — Total wattage of connected equipment

Explanation: The formula converts battery capacity to watt-hours (Ah × V = Wh) then divides by load to determine runtime.

3. Importance of Run Time Calculation

Details: Accurate run time estimation is crucial for ensuring critical systems remain operational during power outages, especially for medical equipment, servers, and emergency systems.

4. Using the Calculator

Tips: Enter battery capacity in amp-hours (Ah), system voltage in volts (V), and total load in watts (W). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is MPH load?
A: MPH (Maximum Power Handling) load refers to the total wattage of all equipment connected to the UPS that will be powered during an outage.

Q2: How accurate is this calculation?
A: This provides an estimate. Actual runtime may vary due to battery age, temperature, discharge rate, and conversion efficiency.

Q3: Should I add a safety margin?
A: Yes, it's recommended to add 20-30% to the calculated runtime to account for battery aging and unexpected load increases.

Q4: What if I have multiple batteries?
A: For parallel batteries, sum the Ah ratings. For series configurations, use the combined voltage but individual Ah rating.

Q5: How does battery age affect runtime?
A: Batteries typically lose 20% of capacity after 2-3 years, and up to 40% after 4-5 years, significantly reducing runtime.