Electronics > Projects, Designs, and Technical Stuff
switching-PSUs: why can't you usually exceed the 50% of declared power?
mikerj:
--- Quote from: wraper on May 24, 2020, 01:14:58 pm ---
--- Quote from: PKTKS on May 24, 2020, 12:55:28 pm ---This is a total wrong argument. The savings on the bill
promoted by such "ratings" 80% 90% gold plus shit are garbage.
Those PSUs are targeted to high end PCs where you use
hungry power GPUs which waste awesome 700W of true power
plus ownership costs.
SOHO and POS are well below 300W and the cost focus
is more on hardware wearing out soon than the mains bill
--- End quote ---
Total bullshit. Even if computer consumes only 100W, 10% consumption difference is a big deal. And estimation in my previous post is based on such figure for office use. If there is high-end GPU and frequent gaming involved it becomes even more noticeable and more expensive PSU may pay off in less than a year.
--- End quote ---
All depends. A single computer at home used maybe a couple of hour a day or so and the savings will be barely noticeable. A whole office full of PCs running 24/7 and the savings start to look a bit more compelling.
Monkeh:
I had a machine with an ~80% efficient (at this load) supply which ran 24/7/365, at about 85W at the wall. If I'd had a.. less than stellar supply in it such as those suggested, call it 95W. That amounts to something around £10-20 a year (prices vary wildly, apparently the current average is 14.37p/kWh, or £12.59 a year). That's not that different to the cost difference between a cheap trash supply (about £15-20) and a current 80+Gold supply (about £45). That machine was in said use for four or five years.
Meanwhile, I spent £20 and replaced it with something using 20W at the wall.. paid for itself in months.
wraper:
--- Quote from: engrguy42 on May 24, 2020, 01:20:29 pm ---Again, do you have ACTUAL numbers to support this, or is it just vague generalizations based on personal belief?
--- End quote ---
Say ((15W (efficiency difference) * 8h * 261 days + 3W * 24h (standby PSU efficiency) * 365 d) * $0.20 kWH = $11.5
engrguy42:
--- Quote from: wraper on May 24, 2020, 01:30:00 pm ---
--- Quote from: engrguy42 on May 24, 2020, 01:20:29 pm ---Again, do you have ACTUAL numbers to support this, or is it just vague generalizations based on personal belief?
--- End quote ---
Say ((15W (efficiency difference) * 8h * 261 days + 3W * 24h (standby PSU efficiency) * 365 d) * $0.20 kWH = $11.5
--- End quote ---
So you're running your computer at full power for 8 hrs/day, 365 days/year?
coppice:
--- Quote from: engrguy42 on May 24, 2020, 01:52:13 pm ---
--- Quote from: wraper on May 24, 2020, 01:30:00 pm ---
--- Quote from: engrguy42 on May 24, 2020, 01:20:29 pm ---Again, do you have ACTUAL numbers to support this, or is it just vague generalizations based on personal belief?
--- End quote ---
Say ((15W (efficiency difference) * 8h * 261 days + 3W * 24h (standby PSU efficiency) * 365 d) * $0.20 kWH = $11.5
--- End quote ---
So you're running your computer at full power for 8 hrs/day, 365 days/year?
--- End quote ---
Haven't you seen how gamers live? :)
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