Posted by Brian Graham on August 23, 2006, 10:14 am
A friend of mine sent me a picture of the contacts on the back of his panels.
His panel has 4 contacts, with diodes connected between. A picture is worth
1000 words, so here's a link to it.
http://www.personainternet.com/vgap/solar/contacts.jpg
I'm thinking that they are bypass diodes between segments of his panel (155W)?
Its been 20 years since I've seen diodes in school. The end with the stripe is
the negative?
I believe therefore that he'll attach leads to the left-most and right-most
contacts. Ultimately he'll connect 4 of these panels in series for a 48V system.
--
Brian
Posted by Jeff on August 23, 2006, 3:55 pm
Brian Graham wrote:
> A friend of mine sent me a picture of the contacts on the back of his panels.
His panel has 4 contacts, with diodes connected between. A picture is worth
1000 words, so here's a link to it.
>
> http://www.personainternet.com/vgap/solar/contacts.jpg
>
> I'm thinking that they are bypass diodes between segments of his panel (155W)?
Its been 20 years since I've seen diodes in school. The end with the stripe is
the negative?
Other way around.
>
> I believe therefore that he'll attach leads to the left-most and right-most
contacts.
It would seem that way. I see no other way to hook it up. You should see
1/3 the voltage across each set of terminals, and the full voltage
across both ends.
I'm not a PV person, but know a bit about electrity.
Jeff
Ultimately he'll connect 4 of these panels in series for a 48V system.
> --
> Brian
Posted by Solar Flare on August 23, 2006, 7:46 pm
It depends how you look at it. Think of a diode with the picture
painted on it and then the space was limited so they erased all but
the straight line (arrow gone)
The other thing I have heard is that the line is the back of the
letter "K" for cathode.
>A friend of mine sent me a picture of the contacts on the back of his
>panels. His panel has 4 contacts, with diodes connected between. A
>picture is worth 1000 words, so here's a link to it.
> http://www.personainternet.com/vgap/solar/contacts.jpg
> I'm thinking that they are bypass diodes between segments of his
> panel (155W)? Its been 20 years since I've seen diodes in school.
> The end with the stripe is the negative?
> I believe therefore that he'll attach leads to the left-most and
> right-most contacts. Ultimately he'll connect 4 of these panels in
> series for a 48V system.
> --
> Brian
Posted by John Dunkley on August 23, 2006, 8:02 pm
Most PV panels come with a data sheet showing connections for series or
parallel of their panels.
I suggest you contact manufacturer for this information before you try and
connect them.
Some have 2 diodes others have 2 diodes.
My BP Solar panels have 2 diodes.
JD
> It depends how you look at it. Think of a diode with the picture painted
> on it and then the space was limited so they erased all but the straight
> line (arrow gone)
> The other thing I have heard is that the line is the back of the letter
> "K" for cathode.
>>A friend of mine sent me a picture of the contacts on the back of his
>>panels. His panel has 4 contacts, with diodes connected between. A
>>picture is worth 1000 words, so here's a link to it.
>>
>> http://www.personainternet.com/vgap/solar/contacts.jpg
>>
>> I'm thinking that they are bypass diodes between segments of his panel
>> (155W)? Its been 20 years since I've seen diodes in school. The end
>> with the stripe is the negative?
>>
>> I believe therefore that he'll attach leads to the left-most and
>> right-most contacts. Ultimately he'll connect 4 of these panels in series
>> for a 48V system.
>> --
>> Brian
>
Posted by Merlin-7 KI4ILB on August 24, 2006, 7:48 pm
> A friend of mine sent me a picture of the contacts on the back of his
panels. His panel has 4 contacts, with diodes connected between. A picture
is worth 1000 words, so here's a link to it.
> http://www.personainternet.com/vgap/solar/contacts.jpg
> I'm thinking that they are bypass diodes between segments of his panel
(155W)? Its been 20 years since I've seen diodes in school. The end with
the stripe is the negative?
> I believe therefore that he'll attach leads to the left-most and
right-most contacts. Ultimately he'll connect 4 of these panels in series
for a 48V system.
> --
> Brian
The stripe goes toward the electrical flow...its not really a positive or
negitive.
Joe
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