UPS battery runtime from battery Ah, system efficiency, and load - standard redundancy check for critical-load continuity.
Formula
$$ t = \frac{Ah \cdot V \cdot \eta}{P_{load}} \cdot 60 $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $Ah$ | Battery capacity | Ah | battery nameplate |
| $η$ | System efficiency | - | maker data |
Sources
- IEEE 1188 / IEC 62040.