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Old 08-23-2009, 07:24 PM   #1
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newbe here, on solar panels


Hi everyone, I'm a DIY solar panel maker. Well., I have only one for now but there are more to come. I'm from Wyoming the windy high country.
I was looking for some one to talk to about the DIY home made solar panels.

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Old 08-23-2009, 08:31 PM   #2
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newbe here, on solar panels


Photos, please . . .?

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Old 08-24-2009, 08:36 AM   #3
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Yoyizit,
I'll get a photo as soon as I figure out how to post it here.
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Old 08-24-2009, 02:07 PM   #4
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I have a Picture of my first solar panel. Not very pritty it took me a while to make it. I still need to ask questions about this? src="http://i635.photobucket.com/albums/u...e/DCP_0682.jpg" border="0" alt="My First Solar Panel"></a>

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Old 08-24-2009, 02:24 PM   #5
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It's 10" x30"?
Photovoltaic?
You know your insolation?
http://www.solar4power.com/solar-pow...on-window.html

Last edited by Yoyizit; 08-24-2009 at 02:26 PM.
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Old 08-24-2009, 04:19 PM   #6
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The size is 21&1/2 x 45&3/4 thats the outer dim.
there are 36 cells in series. I tested each one be fore I put them together and one was 7.85 and the other was 7.9 but thats early in the morning.
i can't understand when I tie them together the voltage stays around 7.6 .
when I'm suppose to get 18 or 19 volts
the cells were 3x6 evergreens.
I want to try one with out wood.
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Old 08-24-2009, 06:39 PM   #7
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Quote:
Originally Posted by WayneBlake View Post
The size is 21&1/2 x 45&3/4 thats the outer dim.
there are 36 cells in series. I tested each one be fore I put them together and one was 7.85 and the other was 7.9 but thats early in the morning.
i can't understand when I tie them together the voltage stays around 7.6 .
when I'm suppose to get 18 or 19 volts
the cells were 3x6 evergreens.
I want to try one with out wood.
You should get ~70w in bright sunlight.

36 ea. 0.8v cells in series should give you ~29v.

You have a link to your cell manuf. & cell model?
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Old 08-24-2009, 06:42 PM   #8
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I don't know if I can just transfur my link straight to here but I'll try and if this doesn't work I'll type it in.

LINK REMOVED

This is one that i use more offten but there is alot on ebay.
3x6 cells .55V 3.6 amps 1.98watts

Solar Insolation is 5.0 - 5.4

Last edited by Termite; 08-27-2009 at 12:09 AM. Reason: site rules violation: advertising link removed
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Old 08-24-2009, 06:57 PM   #9
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Quote:
Originally Posted by WayneBlake View Post
LINK REMOVED

3x6 cells .55V 3.6 amps 1.98watts

Solar Insolation is 5.0 - 5.4
You should get at least ~20v out of this array with no load on it, and with a 5.6 Ω 150w load resistor you should get ~72w.

The insolation value will give you the w-h per day.

Maybe some of the cells are shorted or open. Test them individually for open circuit voltage.

With this link
http://en.wikipedia.org/wiki/Solar_cell
and your readings we should be able to figure out each component value in the circuit under the heading
Equivalent circuit of a solar cell

Last edited by Yoyizit; 08-24-2009 at 07:00 PM.
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Old 08-25-2009, 06:55 AM   #10
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Thank you, I'll have to go back and test them. Today I have just received 50 4x4" solar cells. I'm going to out them in rolls of 10 and make a solar panel. I have some cells that are 1"x21/2" and I really don't do much of anything with them. This is one of my dumb mistakes I made when I ordered them.
Thanks again I'll check them.
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Old 08-25-2009, 11:15 AM   #11
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With the voltmeter common lead at one end of the panels, in bright sunlight, with all panels in series, your reading should increase by ~0.5v for each panel that you probe.
With this many cells I'd start at the midpoint and look for your ~10v. If it's not there, look in the bottom half. Otherwise look in the top half. The quickest way to find the problem in an arrangement like this is to keep halving the number of cells monitored [binary search/binary chop routine].

Last edited by Yoyizit; 08-25-2009 at 12:34 PM.
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Old 08-25-2009, 02:37 PM   #12
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Thank You ,I'll try that. I need to get it going befor I start on the 4x4" cells.

Thanks again
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Old 08-26-2009, 04:23 PM   #13
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newbe here, on solar panels


Welcome! And goodluck with your project!

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