Power consumption, standby and heat
Where the PSU lives.
- Standard
- Vendor
- ISO 21118
- Extension
A 250 W projector gives off about 853 BTU/h of heat, like 2.5 100 W bulbs. Used 3 hours a day it draws 274 kWh a year, which costs $46.54 at $0.17 per kWh.
Nearly all of a projector's electrical draw ends up as heat in the room: 1 W = 3.412 BTU/h. Default wattage, hours and price are illustrative, not a specific model. Yearly figures assume the projector draws the stated watts for every hour of use.
Power draw
Hours per day
Price per kWh
- Heat output
- 853 BTU/h250 W × 3.412
- Same heat as
- 2.5 × 100 W bulbs
- Energy per year
- 274 kWh
- Cost per year
- $46.54$3.88 per month
Show the numbers
| Watts | 250 |
|---|---|
| BTU/h | 853.0 |
| Hours per day | 3 |
| kWh per year | 273.8 |
| Price per kWh | $0.17 |
| Cost per year | $46.54 |
How to compare it
Power supply
An external brick adds clutter and a failure point. USB-C PD means one-cable portables.
Terms on this page
Power consumption
Watts in normal, eco and standby. Networked standby matters under EU rules. ⚖ power.watts_normal, power.watts_eco, power.watts_standby ↓
Power supply
Voltage range, internal vs external brick, DC-in. ⚖ power.voltage, power.psu = internal | external