To determine the backup time provided by your batteries in a UPS (Uninterruptible Power Supply) system:
Identify Battery Capacity:
Determine the capacity of your UPS batteries, usually measured in ampere-hours (Ah) or watt-hours (Wh). This information is typically provided in the UPS documentation or on the battery itself.
Calculate Load Power:
Calculate the total power consumption of the devices connected to the UPS. This can be done by adding up the wattage or VA ratings of all the equipment.
Convert Load Power to Amps:
If your load power is given in watts, divide it by the UPS output voltage to convert it to amps. This will give you the current draw of your equipment.
Estimate Efficiency:
Consider the efficiency of the UPS system, typically between 80% to 90%. This accounts for power loss during the conversion process. Line-Interactive systems as low as 60%
Estimate Runtime:
Divide the battery capacity by the power consumption calculated to estimate the runtime in hours. This will give you an approximate backup time under ideal conditions.
Consider Depth of Discharge:
Take into account the depth of discharge (DoD) of the batteries. It's generally recommended to limit the DoD to prolong battery life. For example, if you only want to discharge the batteries to 50% of their capacity, adjust the runtime accordingly.
Account for Aging and Temperature:
Keep in mind that battery runtime may decrease over time as batteries age and their performance degrades. High temperatures can also reduce battery efficiency and capacity.
Perform Real-World Testing:
For a more accurate estimate, perform real-world testing by disconnecting the UPS from utility power and observing how long it can sustain the connected load.
By following these steps, you can determine the backup time provided by your UPS batteries and ensure that your critical equipment remains powered during outages. It's important to regularly test and maintain your UPS system to ensure reliable performance when needed.
Always refer back to a qualified technician when sizing or upgrading your system
Team Cumhachtach
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