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'[EE:] Source for small Solar pannels'
2004\02\03@050036 by Antonio Sergio Sena

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Hello

i am looking for a while, for a source for small solar panels.

For small, i mean low power and credit card size +-.

Something around 6V peak @ 50mA would be great!
Stacking of low voltage very small pannels would be great either.

I would like to hear your thought, ideas and hints!

Thanks very much
Antonio Sergio Sena













---------------------------------------------
Antsnio Sirgio Sena
(Field Applications Engineer)

Primetec - Engenharia de Sistemas, Lda.
Rua Porto Alegre, 9 - 1: Esq.
2780-031 Oeiras
PORTUGAL

e-mail: spam_OUTasenaTakeThisOuTspamprimetec.pt
WEB: http://www.primetec.pt







.

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2004\02\03@050905 by Alan B. Pearce

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?i am looking for a while, for a source for small solar panels.
>
>For small, i mean low power and credit card size +-.

Hmm, I take it from your email address (.pt) that you are in Portugal. I
would suggest you try RS Components and check catalogue numbers 194-098,
194-127, 194-133 and 194-149. See rshttp://www.com or try Farnell or Conrad
for similar items. A couple of these numbers I have quoted are supplied to
RS by BP Solar, so it may be worth while contacting them. I know that RS was
one of the recommended suppliers for the Robot Challenge that the BBC ran
late last year, but have no experience with the product itself.

Another option may be just to butcher a solar powered calculator, depending
how many you want.

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2004\02\03@054300 by Russell McMahon

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> i am looking for a while, for a source for small solar panels.
>
> For small, i mean low power and credit card size +-.
>
> Something around 6V peak @ 50mA would be great!
> Stacking of low voltage very small pannels would be great either.

That's a very modest requirement - 300 mW peak.
If this is fro one off or small volume jobs then calculator or hobbyist
panels would probably be suitable. These are liable to be amorphous silicon
which have significantly lower efficiencies and lower lifetimes so the
application may affect what you do. You get about 500 mV peak per cell so
you are going to need 12 cells. You can stack individual cells yourself but
it becomes very cost ineffective to do so.

You could consider using a smaller voltage unit (say 2 volts) with a stepup
converter. Using fewer larger cells may make it appropriate to series
connect 4 cells that are better suited to your application. A converter IC
intended to run on a single alkaline cell would work with this.


       Russell McMahon

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2004\02\03@101509 by David Schmidt

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Antonio,
Under what light source/intensity are you looking for 6V peak at 50mA?

Dave
> Something around 6V peak @ 50mA would be great!

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2004\02\03@102756 by Antonio Sergio Sena

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In fact the 194-098 model, is +- what im looking for. The cells it self.
But less voltage, around the same voltage.
Having work with RS before, i know that they have higher prices than other
distributers.

Yep i know BP Solar, i have some panels made by them. They work great so
far.
Big ones, around 50W. Enough juice to power my radios at the shack!

Alan, thanks for the hint!


Antonio Sergio Sena







> ?i am looking for a while, for a source for small solar panels.
> >
> >For small, i mean low power and credit card size +-.
>
> Hmm, I take it from your email address (.pt) that you are in Portugal. I
> would suggest you try RS Components and check catalogue numbers 194-098,
> 194-127, 194-133 and 194-149. See rshttp://www.com or try Farnell or
Conrad
> for similar items. A couple of these numbers I have quoted are supplied to
> RS by BP Solar, so it may be worth while contacting them. I know that RS
was
> one of the recommended suppliers for the Robot Challenge that the BBC ran
> late last year, but have no experience with the product itself.
>
> Another option may be just to butcher a solar powered calculator,
depending
> how many you want.
>
> --

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2004\02\03@103213 by Antonio Sergio Sena

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> > i am looking for a while, for a source for small solar panels.
> >
> > For small, i mean low power and credit card size +-.
> >
> > Something around 6V peak @ 50mA would be great!
> > Stacking of low voltage very small pannels would be great either.
>
> That's a very modest requirement - 300 mW peak.
> If this is fro one off or small volume jobs then calculator or hobbyist
> panels would probably be suitable. These are liable to be amorphous
silicon
> which have significantly lower efficiencies and lower lifetimes so the
> application may affect what you do. You get about 500 mV peak per cell so
> you are going to need 12 cells. You can stack individual cells yourself
but
> it becomes very cost ineffective to do so.
>
> You could consider using a smaller voltage unit (say 2 volts) with a
stepup
> converter. Using fewer larger cells may make it appropriate to series
> connect 4 cells that are better suited to your application. A converter IC
> intended to run on a single alkaline cell would work with this.
>
>
>         Russell McMahon
>
> --


Im going to use the cells to give enough power to compensate for leakage
currents of the battery,
and to power the circuits during day time. While doing very low charging.

Yes, im using a very low power stepup converter. The average power i spend
per day is never
higher than 15mA, maybe 20mA. Sometimes less than 10mA. Depends on the need
the user has of the circuit.


   Antonio Sergio Sena

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2004\02\03@103625 by Antonio Sergio Sena

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Hello David,

ill be looking to have that power at peak day light, on a good summer day :)

As i said on a previous email, the pannels are almost to do some energy
Scavenging from the environment. This case, sun light.
Need to compensate for battery self discharge, and to low low charge the
batteries i have.
Using a low power setup also.

Whats your idea ?


Antonio Sergio Sena







> Antonio,
> Under what light source/intensity are you looking for 6V peak at 50mA?
>
> Dave
> > Something around 6V peak @ 50mA would be great!
>

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2004\02\03@111612 by David Schmidt

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I didn't know what your application was, I just knew that rated output is
usually in full sunlit conditions.
If you were planning on using panels indoors, you'd be sorely disappointed
with their output.

I'd buy whatever you can from the surplus market and make a 'charge
controller' do the battery charging/maintenance for you.

FWIW, I ran 8 Siemens 55W panels through a Trace C40 charge controller to
880AH 12V golf cart battery array to an
Exeltech XP1200 inverter for a few years.

Dave

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2004\02\03@112825 by Alan B. Pearce

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>I didn't know what your application was, I just knew
>that rated output is usually in full sunlit conditions.
>If you were planning on using panels indoors, you'd be
>sorely disappointed with their output.

Heh, yeah, the BBC robots contest I mentioned, for the solar section, they
had the cars sitting on the start line, and then to start them turned on a
huge bank of floodlights along the length of the track.

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2004\02\03@113901 by Antonio Sergio Sena

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Indeed what you say is true. I had the opportunity to try that a few years
back, when i "dinscovered" solar pannels :)

These modules will work onsite, under full weather, in a windowed box. So, i
think that to maintain the average energy in the batteries, itll be ok.
These is going to be a prototype test, though. Thus ill make any necessary
changes later in time, if needed.

Antonio Sergio Sena










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