Set a timer on an idle entertainment strip
A household measures 8 W from a group of media devices while unused. The devices sit idle for 20 hours each day and the proposed timer disconnects them for 16 of those hours.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Power unit | W |
| Power | 8 |
| Hours per day | 20 |
| Days or equivalent sessions | 30 |
| Duty cycle (%) | 100 |
| Energy price (USD per input kWh) | 0.25 |
| Alternative power (W) | 8 |
| Alternative hours per day | 4 |
| Alternative duty cycle (%) | 100 |
Baseline: 8 ÷ 1,000 × 20 × 30 × 100% = 4.8 kWh. Alternative: 8 ÷ 1,000 × 4 × 30 × 100% = 0.96 kWh. Multiply both by 0.25; the baseline minus the alternative is USD 0.96.
Modeled difference · USD 0.96
What the comparison shows
The strip still uses 0.96 kWh during four hours of standby daily. The baseline standby bill was only 1.20.
Assumptions and limits
Model only the standby window. Active watching and any power used by the timer itself are outside the comparison.