Re: Energy saver circuit

On Nov 20, 6:03 pm, d...@xxxxxxxxxxxxxx (Don Klipstein) wrote:
In article <4qm6k3lu7u6fd9baa5nefb8ppouo58f...@xxxxxxx>, D from BC wrote:
On Tue, 20 Nov 2007 12:37:57 -0800 (PST), apogeusiste...@xxxxxxxxx
wrote:

Hi:
Can you tell me how create an energy saver like this:
http://www.electric-saver.com/

Thank you

I don't know too much about PF correction but I do know:

Stove: Doesn't need power factor correction.
Incandescent lights: Doesn't need PF correction.
Vacuum: Who cares..not on long enough
Computer: Already has PF correction.

Ballast for tube lights: ??
Let's say a ballast has a PF of 0.5.
So 200Watts billed to supply 100Watts.
(If I got that right..)

Does a 90% efficient converter doing power factor correction that
burns 10Watts to deliver 100watts to a ballast result in a power
reduction of 90 watts?

Electric meters only bill for "real" watts, so one does not pay for
extra amps due to poor power factor. Actually, one pays for watts lost in
wiring downstream of the electric meter, but correcting power factor is
unlikely to save more than a couple to occaisionally a few percent there.

Power factor is mainly of concern to commercial and industrial
customers, since power companies do not want to install or add capacity to
carry current that does not translate to billable watts.

Also, most fluorescent fixtures 32 watts or more already have high power
factor.

Fridge?

Power factor of most induction motors is said to be about .8.

- Don Klipstein (d...@xxxxxxxxx)- Hide quoted text -

- Show quoted text -

I second this response. PFC does not magically save power, it only
smooths out high peak currents to make the load look more resistive
from the power comany's perspective. The power company only cares
about power factor when the customer is drawing huge peak currents.
Peak currents cause loss in their supply wires which is a loss to
their bottom line. That's why power from the power company is supplied
in such high voltages, it reduces the current and therefore the
resistive loss in the wires.

This box is a scam. Passive or active PFCs with any decent power
output have huge components. You would waste more power in the PFC
than you would save in the supply wires in a normal house and like I
said, the power company does not monitor residential customers for bad
power factor.

Traver
.

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