cost per kWh [RE-wrenches]

[joeldavidson at earthlink.net]

Good point. Many off-grid system charge controllers go to float mode before
2pm in summer because the PV array is sized for winter insolation. I use to
turn on fans to use the extra free summer electricity :-)

Original Message:
-----------------
From: Bill Brooks billb at endecon.com
Date: Mon, 2 Jun 2003 09:33:42 -0700
To: RE-wrenches at topica.com
Subject: RE: cost per kWh [RE-wrenches]


Don,

I think your number is in the right ballpark for off-grid because array
utilization tends to be low during summer months. Joel's number is accurate
for on-grid systems.

Bill.


-----Original Message-----
From: Don Loweburg, Offline [mailto:i2p at aol.com]
Sent: Sunday, June 01, 2003 11:41 AM
To: RE-wrenches at topica.com
Subject: Re: cost per kWh [RE-wrenches]



In a message dated 05/31/2003 8:14:50 PM Pacific Daylight Time,
joeldavidson at earthlink.net writes:

> 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
Joel
I figured this is more conservative than most. Not to quible but I prefer to
be very conservative estimating offgrid systems. I would go with your
derates
for a battery system -grid connected.


Best,Don

--
[Non-text portions of this message have been removed]

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