SW Efficiency/ PWM Angle Adjustment [RE-wrenches]

[Bill Brooks]

Drake,

It is my understanding that the standard kWh meter only measures real power
flow. My revenue meter agreed with my data logger and power analyzer
measurements and saw none of the extra current the poor inverter was running
thru it.

That extra current was causing an efficiency loss meaning less power was
making it to the grid since it was taking more DC power to make the AC
output. The cooler running unit is simply the benefit of higher efficiency
(less energy is lost in the inverter as heat).

Bill.


> -----Original Message-----
> From: Drake Chamberlin - Electrical Energy
> [mailto:solar at eagle-access.net]
> Sent: Thursday, September 06, 2001 5:03 PM
> To: RE-wrenches at topica.com
> Subject: Re: SW Efficiency/ PWM Angle Adjustment [RE-wrenches]
>
>
> Hi Wrenches,
>
> To further complicate matters, the energy and economic issues may be
> different with various power factors.  I read once, in an electrical
> engineering textbook, that most utilities bill on the basis of apparent
> power.   That means that reactive power is being billed even though it
> produces no useful work.  This is an old textbook, and could well
> be out of
> date.
>
> So if an inverter produced a lot of reactance, would the apparent
> power or
> real power register on the utility meter?   Would putting pure resistive
> power back in the grid have a greater payback than power with a large
> reactive component?  Could we be selling both reactive power and
> real power
> to the grid?
>
> Bill & Sharkey, thanks to both of you for your many contributions.  I'd
> prefer to see your continued participation.   It is this spirited
> dialogue
> that allows us to figure out the subtle  points of our increasingly
> technical business.
>
> Drake
>
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>

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