cost per kWh [RE-wrenches]

[Joel Davidson]

Don,
0.50 is pretty serious derating from STC to Real World AC. I multiply STC by 0.64 for
single crystal and 0.62 for poly and then factor in array azimuth and tilt. The results
are a little conservative compared to actual performance, but I rather the customer
pleasantly surprised with more energy than estimated (a baker's dozen) than feel
short-changed.
Best regards,
Joel Davidson

"Don Loweburg, Offline" wrote:

> In a message dated 05/30/2003 1:25:35 PM Pacific Daylight Time,
> billb at endecon.com writes:
>
> > I think the correct method is to use watts and an appropriate adjustment
> > factor rather than amps.
> >
>
> Here's a seat of the pants estimating method I use for sizing battery
> systems. Crude but comes closer than most of us would wish for stand alone systems.
> Multiply STC array watts X Peak Sun hours - divide by two= AC KWH/day.
> Don

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