Tool Example
Home Battery Runtime Calculator
Battery Runtime Example: Router, Laptop and Lamp
This example uses a hypothetical small outage kit with a router, laptop, and LED lamp.
This example uses a hypothetical scenario to show how the calculator works. It is a curated example page, not a saved user result or a claim about a real person.
Inputs used in the example
| Input | Example value |
|---|---|
| Battery | 500 Wh rated capacity |
| Loads | Router 12 W, laptop 45 W for part of the day, lamp 8 W |
| Efficiency | Conservative inverter-loss assumption |
Output interpretation
Small communication and light loads can run much longer than heat, cooking, or large appliances.
Runtime depends on actual watts and whether the laptop is charging continuously or cycling.
A log is useful because the same setup changes when work hours, brightness, and battery reserve change.
What to check next
- Measure real watts with the devices in their normal mode.
- Keep a reserve instead of planning to drain the battery completely.