Do you have a question? Post it now! No Registration Necessary. Now with pictures!
- Posted on
- Power Saver device
April 20, 2011, 3:05 pm
rate this thread
250W power supply)
"It uses a state of the art electrical technology to actively monitor and
improve the power factor of electrical appliances, suit for household or
The technology optimizes the voltage and current demands to reduce the
active power demands, reduce electricity bills by up to 35%."
There is a note: "Note: Please make sure that it is installed as close as
possible to the point of entry of your electricity supply in order to detect
all loads before the meter and adjust the power factor accordingly". Can be
connected to one Saver a few electrical devices(PC, TV, with total power
less than 18KW) via multi socket extension lead?
Does anyone have experience with such a device and if so what kind / brand
do you use?
Re: Power Saver device
Think about it.
If everybody could save 35%, don't you think it'd be a REQUIREMENT
imposed by our governments? Wouldn't the power company implement it
rather than building new power plants? In fact, they DO implement it
but on much larger segment of the grid.
Power factor improvement, IS good for the power companies and ultimately,
the environment. It's a requirement for newer electronic devices.
BUT...YOU very likely pay for Kilowatts.
Power factor correction helps Volt-Amps and makes approximately zero
difference in your power bill.
There's a local guy selling 'em on Craigslist.
I email him and he's eager to come out with his demo and
gimme a demonstration on HIS meter.
When I tell him we're gonna measure the effectiveness by
measuring how fast the wheel on the power company's meter
goes around with and without his device, he never responds back.
Put this in the file with the 200mpg carburetor that "the oil
companies don't want you to know about", and the "add three inches..."
Re: Power Saver device
None, but I know it is a scam.
Hint 1, a bad power factor doesn't cost me more money.
Hint 2, get a cheap power meter with a power facor read out, then look
up how to do the power factor correction and buy the appropriate
capacitor, then either add it to the motor or box it for the motor to
plug into. Far cheaper.
Re: Power Saver device
If you want a PC power supply to waste less power, get one with
a good rating. The "80 Plus" system rates supplies to help
identify ones that are more efficient at power conversion.
Efficiency of that unit is 90% from 111W to 448W (in other words,
that design is noteworthy for achieving good results over a wide
Regular ATX supplies are 68% efficient, which means the interior
of the power supply generates a fair amount of heat. An 80% to
90% efficient ATX supply, can reduce that kind of waste. The
Kingwin power supply can leave its fan turned off, a lot of
You then have to consider the pay back period, for such an ATX
supply upgrade. If the Kingwin supply costs $149 USD, it would take
years for the power savings to pay off.
The efficiency of a supply internally, is to some extent independent
of the power factor issue. (In other words, buying a new supply could
well save a higher percentage, than any PFC scheme might.) Power factor
correction is mandated on ATX supplies now, in the interests of the
utility companies, rather than for the home consumer. In a business
setting, ATX supplies with power factor correction makes sense (because
they're billed on kVA), while for home consumers this is largely a
"don't care" consideration. So the inclusion of PFC in ATX supplies in
North America, is to help large business installations. For example,
my former employer had a 30 megawatt feed, powering lots and lots of
computers (so many computers, that the heat from the computers provided
the heating for the buildings). In such a situation, a person purchasing
equipment, will be looking for PFC due to the size of the loads involved.
For a home consumer, with one 150W PC, this isn't an issue that needs to be
addressed. Home heating and cooling are much larger loads in North America
(central air conditioning or heating systems), compared to the 150W idling PC.
Your original question, may have to do with a "power factor correction"
type device. An example of information on such a solution is
described here. In some countries, they may bill kVA as well as kW,
while as far as I know, my meter only measures kW (kW-hours).
I pay a total price right now of around $0.17 per kWh. My 150W
PC costs me about 3 cents per hour, while it is running.
The paragraph "Why correct the power factor?" here, helps explain
all it is doing is reducing the drop in the distribution wires "Rline".
In my house, that drop in voltage is pretty damn small.
If your PC ATX supply already has passive PFC or active PFC in it,
that little box from eecrest.com will do nothing. Similarly,
if you're running an incandescent light bulb, the eecrest.com
box will do nothing. It might even waste a few watts itself.
In the past, if you compared an ATX supply with active PFC,
versus one without active PFC, the PFC circuit itself wastes
a bit of power. But in the larger picture, it helps the utility company,
and means the size of conductors between the power poles, can be
reduced a bit. Not all of the current that flows in the transmission
lines, is "billable" current.
- » Newest MemTest86, MemTest86+ incompatible with Sandy, Ivy chipsets?
- — Next thread in » Computer Hardware
- » new desktop availble with ssd drive installed as boot drive?
- — Previous thread in » Computer Hardware