UPS sizing from connected critical loads
UPS capacity depends on the actual critical load, not a rough estimate. Model your critical loads in ekx and the UPS kVA requirement calculates directly from the connected equipment.
What you get
Total critical load calculated from the devices actually connected to the UPS in your model.
UPS kVA sized from connected load including power factor and derating considerations.
UPS fault current contribution included in the short circuit analysis.
Bus voltages at critical loads calculated via load flow to verify adequate supply.
UPS is part of the one-line — not a standalone calculation disconnected from the system.
UPS input circuit and upstream protection sized based on UPS input current requirements.
UPS sizing in the context of the electrical system
A UPS doesn't exist in isolation. It has an input circuit, a bypass, a battery, and critical loads. ekx models it all in the same one-line diagram.
- Critical loads connected to UPS in the model — kVA calculates automatically
- UPS input circuit and upstream protection sized accordingly
- Fault current contribution from UPS included in analysis
- Voltage at critical loads verified under normal and emergency conditions
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View All PlansFrequently asked questions
UPS kVA is calculated from the total connected critical load, including power factor and a typical design margin. You select from standard UPS sizes.
The UPS can be modeled as a source in the system. Operation under different supply scenarios can be evaluated.
ekx calculates the kVA requirement. Battery runtime is a function of the UPS manufacturer's specific battery configuration and should be confirmed with the supplier.
Yes. Multiple UPS units can be modeled in the one-line diagram with appropriate distribution configurations.
Size your UPS from actual critical loads.
kVA from connected load, not a spreadsheet estimate.
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