UPS runtime limitations
Why UPS runtime needs product battery curves, load profile and operating conditions beyond public electrical calculator outputs.
UPS boundary purpose
UPS runtime is product-dependent. A public load calculator can help record load values, but runtime needs battery capacity, discharge curve, temperature, age, inverter efficiency and manufacturer limits.
This guide explains why runtime remains a review topic rather than a generic calculator result.
Workflow
- Prepare the supported load list and load basis.
- Record UPS model and battery configuration.
- Gather manufacturer runtime curves or product data.
- Record battery condition, temperature and operating mode.
- Treat public calculator rows as inputs only, not runtime output.
Runtime record table
| Field | Record | Review concern |
|---|---|---|
| Load list | kW, kVA or current basis | Runtime changes with real load |
| UPS model | Product and rating | Controls runtime curve |
| Battery condition | Age, capacity and configuration | Runtime can degrade |
| Temperature | Operating environment | Affects battery performance |
| Product curve | Manufacturer data source | Controls runtime estimate |
Boundaries
- Do not calculate UPS runtime from load current alone.
- Do not hide battery age or condition.
- Do not reuse runtime from another UPS model.
- Do not treat public calculator rows as manufacturer curves.