[SATLUG] Re: Any Technical/Automation - now PV

pjcrux at gmail.com pjcrux at gmail.com
Mon May 24 10:44:29 CDT 2010

Agreed! However, one of the things I do not like about the way cps sets up the pv arrays is that you are not allowed to setup a battery cell bank to store excess it all has to go back to the grid. I may be wrong but that's how I interpreted/read the literature.


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-----Original Message-----
From: "Borries Demeler" <demeler at biochem.uthscsa.edu>
Date: Mon, 24 May 2010 09:01:48 
To: The San Antonio Linux User's Group Mailing List<satlug at satlug.org>
Subject: Re: [SATLUG] Re: Any Technical/Automation - now PV

> Excellent advice.
> pcdls
> P.S.  love your PV comment in your sign-off.  Do PV actually pay off in
> the long term, given initial cost, degradation, service and the like?
> Doubt it.  At least my calculations have indicated it to be
> cost-prohibitive in the long term model.  Now if I lived in a windy
> area, at least I could CNC some replacement parts to a wind turbine as
> part of a long term maintenance and repair effort using basic human
> ability.  I can't exactly develop and maintain a silicon fab lab (or
> readily find people to support it) to easily support poly-amorphous
> silicon production efforts and switch mode supplies for solar cells
> until we pull our heads out of our butts and actually learn to share
> this sort of manufacturing information.  This is why internal combustion
> engines won't go away any time soon.  Like Linux, it's established
> technology , readily shared and relatively easy to duplicate from a
> manufacturing/production standpoint.

PV systems require up-front investment, but with the rebates and tax
credits available right now, they are VERY reasonable (my recovery is 6
years to break even, shorter if rates go up, after that its $ in my

CPS has its own reasons for subsidizing PV, because they want to avoid
having to build new power plants and very expensive new distribution
infrastructure by reducing the load, so for them it actually pays to give
out rebates.

All of you naysayers are completely ignoring the environmental cost of
burning oil, coal and gas for power production. If you take that into
consideration (as you should!) PVs are a giveaway. But I guess the
prevailing attitude is to come up with excuses why you don't need to give
a shit about global climate crisis and keep denying all scientific
evidence to the contrary. Keep on cranking down the thermostat until you
feel comfortable, keep on driving in your gas-guzzling SUV, and above all,
drill, baby, drill! I never wanted to eat gulf shrimp anyway, and as long
as the environmental impact isn't happening in my back yard I don't see
But heck, it's a free country, so you are entitled to your ways. I just
hope we get a carbon tax soon so you can feel the real cost of this
> Chris wrote:
>> Don Wright wrote:
>>> Doug wrote:
>>>> I spoke to CPS  about one of those, and their advice was that if
>>>> there is usually someone
>> >>home all day then DO NOT have one installed.  But if you do get one
>> and have ANY electronics
>> >> in use, they should be protected by surge protectors and battery
>> back ups or UPS with back up.
>> >> That or kiss them goodbye.
>>> You got a cite from competent authority for that? There's nothing
>>> electrical that differs in this unit from a standard thermostat. The
>>> unit just pretends the temperature is a little different than it is.
>>> The
>>> A/C turns on and off EXACTLY THE SAME as with a standard t-stat, so
>>> where is this magic electronics-destroying monster?
>> Unless CPS has changed policy, they DO install something out at your
>> compressor that prevents it from cycling on for 10 to 15 minuets out
>> of the hour, during high demand periods.
>> If you actually want to lower your electric bill and increase your
>> homes comfort level make sure you have at Least 15 inches of insulation
>> in your attic.
>> Chris (Solar PV panels are for suckers) Lee
> --
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Borries Demeler, Ph.D.
Associate Professor
The University of Texas Health Science Center at San Antonio
Dept. of Biochemistry, 7703 Floyd Curl Drive, San Antonio, Texas 78229-3900
Voice: 210-767-3332, Fax: 210-567-4575, Email: demeler at biochem.uthscsa.edu

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