How do you calculate power supply efficiency?
A power converter’s efficiency (AC-DC or DC-DC) is determined by comparing its input power to its output power. More precisely, the efficiency of the converter is calculated by dividing the output power (Pout) by its input power (Pin).
What is the efficiency of a power supply?
Efficiency is the ratio of total output power to input power, expressed in percent. This is normally specified at full load and nominal input voltage. Power supply efficiency is the amount of the actual power delivered to the components divided by the electrical power drawn from the mains supply socket.
What is 80 plus in power supply?
The 80 Plus is a voluntary certification where manufacturers send samples of their power supplies to an independent body for testing and certification. To be 80 Plus certified, the supply must have at least 80 % efficiency at three load levels of 20, 50 and 100 percent of loading.
What is the power efficiency?
Power efficiency is defined as the ratio of the output power divided by the input power: η = 100% ⋅ Pout / Pin. η is the efficiency in percent (%). Pin is the input power consumption in watts (W). Pout is the output power or actual work in watts (W).
What does 80 plus gold mean?
80 Plus Gold: 87% efficiency @ 20% load; 90% efficiency and power factor of 0.90 @ 50% load; 87% efficiency @ 100% load.
Do you need a 80+ PSU?
Because of the relatively low-cost premium and advantages they provide (discussed below), we do not recommend anything less than 80 Plus, so make sure to look for this logo when shopping for your next PSU. Most power supplies available today are at least 80 Plus rated.
How do I calculate the wattage I need?
Steps
- The number of watts is equal to amps multiplied by volts. That’s it!
- For example, if the current is 3 amps (3A) and the voltage is 110V, you multiply 3 by 110, to get 330W (watts). The formula is P=3A X 110V = 330 W (with P standing for power).
- This is why watts are sometimes called volt-amps.