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Anonymous Poster

Solar panel

11/28/2007 11:32 PM

1.I want to know formula for calculating surface area of solar panel to heat generation.

2.How many basic types of solar panel available?

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Guru
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#1

Re: Solar panel

11/29/2007 4:29 AM

1m2 per person is plenty for domestic even with a simple home made panel.

There is just sooooo much stuff out there...just do a search. 'Solar hot water'

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Guru
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#2

Re: Solar panel

11/30/2007 3:03 AM

When you opened this question or discussion, there was a suggested list of things to do first from CR4 , did you bother to read it? I doubt it.

Good advice for the future, try to help yourself first and just leave special points for us to answer.

What you have done here intimates to us all that you are basically either lazy or blind or both!!

Which means that you will not get much help here.....Do what the first poster suggests as a good start in life......

Another point, register, take a name for yourself and make sure that you tell us at least approximately where you live, it affects any answers we may give....

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Anonymous Poster
#10
In reply to #2

Re: Solar panel

11/30/2007 12:55 PM

It never ceases to amaze me that on every forum there are those who give tolerant and informative answers to the most naive of questioners, while there seem to always be one or two gradiose sadistic jerks who seem to relish in calling the questioner demeaning names instead of sharing what knowledge they have or helping refine the question.......GROW UP Andy....I learn something from every detail people post but people like you seem to have nothing beyond the stink of thier own miserble selves to share...

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Guru
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#13
In reply to #10

Re: Solar panel

12/10/2007 7:28 AM

Here is another one who cannot read and fully understand what is written and hides behind the "guest" name as he is "afraid" of being fully identified in the future as the "lilly livered" person he really is!!!!...

Dear Miss Right (whose first name is always) or unidentifiable guest,

please try and open a discussion yourself one day and read the questionnaire and help file that CR4 puts there to assist people in starting a discussion in a fundamentally and accurate manner.... the idea being to HELP the person concerned to make a proper job of asking a question.....this person simply did not read it and/or take it to heart.....

I feel that that it is a sure sign of NOT being grown up to not follow this simple help (not necessarily anything to do with how old you are in years!), in the same juvenile manner as your post was.

Have a great day, in spite of me!!

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Commentator
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#3

Re: Solar panel

11/30/2007 3:11 AM

There many types of Solar Panels but Photovoltaic panels are the most common for heat generation.

The sun provides nearly 1000W energy per square meter each day.

Ofcourse, how much of this you can actually use is your efficieny of the panel. The kind of sillicon you use will change the charecteristics of your solar panel. You must check your material for the amount of impurities and dopants. Also, the conductivity and heating properties...

Only a certain amount of energy, measured in electron volts (eV) and defined by our cell material (about 1.1 eV for crystalline silicon), is required to energize your panel. The orientation and agle of your panel will also add to the efficency.

A solar panel can generate 70 milliwatts per square inch * 5 hours = 350 milliwatt hours per day.

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#4
In reply to #3

Re: Solar panel

11/30/2007 3:54 AM

'There many types of Solar Panels but Photovoltaic panels are the most common for heat generation.'

No they're not.

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Active Contributor

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#7
In reply to #3

Re: Solar panel

11/30/2007 7:45 AM

Hi my friend from india I suppose ? you know so much about photovoltaics and yet say its most common for heat generation;

Its not and not likely to be in your or my lifetime ;unless you have something up your sleeve .let us know please.

for us solar collectors are the only practical source.

thanks

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Associate

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#5

Re: Solar panel

11/30/2007 5:17 AM

A bit of simple scientific reality seems required here, and perhaps a bit of practicality also!

I live at 36 degrees South and use a 4 M2 solar collector panel for hot water service. For an average of 3 people in the house this provides about 75% of the energy for hot water over the year. Thus some energy boosting is required, especially in winter (may/ sept). In good weather the panels generate about 3.5 Kw in direct sunlight.

These are ALL actual figures in practice and NOT "airy fairy" theorisations.

Solar photovoltaic panels used for heating would be an exercise in expensive futility! It reminds me of a student I was supposed to work with at Auckland University who wanted to use a windmill to heat water in our relatively warm and low wind climate!!!

I also use photovoltaic panels and have 160 watts worth on my roof running down to my radio/computer room where the charging regulator, deep cycle battery (12 volts) and inverter are housed.

With this system I am able to power all the lighting for a 3 bedroom house in reasonably sunny weather. This assumes the use of high efficiency lighting and a typical day with about 3/4 hours bright sunlight and the rest overcast.

Charging rates vary from 3 amperes in cloudy conditions to 13 amps in bright sunlight.

The panels are angled for optimum results during the Equinoxes to even the power output throughout the year as much as possible. When money is available I want to increase the panels tp 300 watts + and make the DC system 24 volts. This will power TV, radio and stereo systems as well as lighting.

I hope that this gives some real practical figures to anyone thinking of alternative energy. So far I have found it well worth while and the solar and other systems I have installed are probably saving us about $700 or 800 NZ dollars ($600 US) a year so far on an investment of about $4,500 which is not a bad rate of return.
Crite40

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#9
In reply to #5

Re: Solar panel

11/30/2007 11:13 AM

good really good calculation and data definitely it help to so many people.

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#6

Re: Solar panel

11/30/2007 7:00 AM

Look up www.homepower.com October issue? (issue 121)

James

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#8

Re: Solar panel

11/30/2007 10:48 AM

As I have stated in other "Solar Heating" threads. Get a copy of Solar Heating Design by Beckman, Klein and Duffy. This is the the first place to start.

As the other have said, PV's are NOT the best for heat generation.

Andy, the CR4 Cop, Get-em Tiger........

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#12
In reply to #8

Re: Solar panel

12/10/2007 7:11 AM

He's already been "got"!!

A lot of people with little knowledge make such blunders......hopefully they will read up and educate themselves!

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#11

Re: Solar panel

12/10/2007 4:30 AM

Ah yes

I apologize.

Photovoltaics are the first thing that comes to my head.

We use these panels in our lab and thus the error...

My dear Indian friend... I am actually a biologist. It is the little I know form the work here on such solar projects. My humble apologies.

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#14

Re: Solar panel

12/10/2007 7:41 AM

OK guys. Guest, in my mind, my experience is this. Photovoltaic panels are used to charge batteries. You either use 12 / 24 or 48 volt DC equipment or you use an inverter to change DC to AC. Heating systems would tend to drain the batteries quickly. Traditionally you use the DC to run lights, computers, the equipment which has a lower demand. As someone mentioned earlier, hot water solar may be your best bet for supplemental heat. Please ask additional questions if this is not clear.

Good luck,

James

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