Runtime is not a number. It is a relationship.
How load level, battery condition, temperature and configuration determine the backup time you can plan for.
The Short Version
- Runtime depends on load percentage, battery age and health, temperature, and configuration.
- Manufacturer charts provide a planning baseline, not a guarantee.
- Plan for the runtime you need under realistic load, not the best-case figure on a datasheet.
Runtime is a relationship
A single runtime figure is only meaningful when the load, battery state, and environment are known. Higher load shortens runtime. Older or degraded batteries deliver less. Temperature affects available capacity.
Use manufacturer charts as a baseline
Manufacturer runtime tables help convert a target duration and load profile into a realistic expectation. They do not replace site-specific measurement where the application is critical.