| Electronics > Projects, Designs, and Technical Stuff |
| switching-PSUs: why can't you usually exceed the 50% of declared power? |
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| PKTKS:
--- Quote from: wraper on May 24, 2020, 12:12:24 pm --- --- Quote from: PKTKS on May 24, 2020, 12:01:25 pm ---SOHO and POS give a shit if 70% 80% or 90% ratings they care about monthly TOC (ownership cost) --- End quote --- Yeah, and garbage you advocate for has higher cost of ownership in any country where electricity price is not dirt cheap. --- Quote ---For the record: I AM NOT "PROMOTING" garbage. Stop saying such shit --- End quote --- Then why everyone laughed at you in the last thread where you praised PSU which internally is basically the same as trash discussed in this thread? --- End quote --- Suit yourself - the money you put in your hardware is all yours. There is nothing to laugh on my simple well put facts. Just the cost which includes repair and probably replacing those advocated "better" ones. Being there several times - they are just as bad and more expensive. Paul |
| engrguy42:
FWIW, it's a myth that higher efficiency power supplies save you a lot of money on your electric bills. Do the math. In the US the average cost of electricity is about 13 cents per kWH. In Brazil it's like 14 cents (US). If you calculate the difference in kWH ACTUALLY used with a 90% efficiency power supply versus an 80% power supply it amounts to maybe a few US $$ per year. A bit like the cost savings by running around your house and turning off a 50 watt light bulb when it's not being used. Unless you run your computer at maximum load 24 hours a day, 365 days a year.... |
| Mechatrommer:
--- Quote from: wraper on May 24, 2020, 11:27:56 am ---Photo of this trash.. --- End quote --- the topology is not much better than cheapo one. they can make nice fan and stickers, enclosure paint, nylon sheath and any spec list they want and put a sound price to it... the way they cut corner on surge protection/PFC stage is just similar to a $10 unit, maybe thats where they outsourced/get their supply from. just for fun, i dig back the $40+ damaged Gigabyte PSU, 1st pic, no cut corner on surge protection, plastic insulation on both sides, look at that nice heatsinks, it can be reused for other project thats why i keep them (i keep more damaged PSU for parts than the working one). but even that beauty, its a PoweRock my ass only worked for about less than a year iirc. 2nd picture is the $20 TronMonxter, no surge protection (cut corner), less 50W power, but worked for 3-4 years. go figure... cheaper is better! ps: both pic below shows better/beefier main transformer than your shown trash. |
| engrguy42:
--- Quote from: blueskull on May 24, 2020, 12:40:21 pm --- --- Quote from: engrguy42 on May 24, 2020, 12:37:52 pm ---A bit like the cost savings by running around your house and turning off a 50 watt light bulb when it's not being used. --- End quote --- I do that all the time. It's not just about money. Saving is just a plain virtue. --- End quote --- That's up to you...as long as you realize the facts, and how it's no different than, say, leaving your air conditioner on a few extra minutes a few times a year when you don't really need it. And so on. Power supply efficiency, for most, amounts to maybe a few $$ per year. If that matters, then fine. As long as people are aware, and not just handwaving on stuff they don't really understand. |
| coppice:
As well as all the issues of cheaper designs being stripped to the bone to sell at crazy low prices, there are also issues of how the load is spread among the output rails. You can only get up to the rated maximum with any PC supply if you load each of the outputs by the right amount. Older supplies focussed a lot of their capacity on the lower voltage rails, and not enough on the 12V outputs to suit modern PCs. Modern supplies have limited capacity on the lower voltage outputs, and most of the capacity is on the 12V outputs. The supplies for most rack mount servers only output 12V these days, and PCs will probably go his way. However, supplies they often have multiple 12V output sections, and you need the load to be balanced across those sections to get close to the rated capacity. |
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