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'[AD]: Solar cells - NZ & Australia only'
2002\01\31@183858 by Russell McMahon

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Dick Smith Electronics have their cat O2017 2 volt 500 mA solar cells on
special at $12.70 + GST trade in 1/s
.
This is an ugly looking octagonal panel using 4 quarter round cells with
"reasonable" but not good packing density. (121mm  x 121mm x 4mm deep.)
Weather sealing is marginal and for real use an exterior cover would be
needed.

Cells are electrically in series.

These cells MAY represent the best value for money per watt available for
small size solar panels. (If anyone in NZ / Oz knows a better value small
panel please advise.)  7 or 8 of these in series would provide a 7 watt 12
volt panel - eg suitable for recharging your laptop during a weekend / week
at the beach (get a life).




       Russell McMahon

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2002\01\31@191110 by Tom Messenger

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At 11:14 AM 2/1/02 +1300, you wrote:
>Dick Smith Electronics have their cat O2017 2 volt 500 mA solar cells on
>special at $12.70 + GST trade in 1/s
>snip<
>These cells MAY represent the best value for money per watt available for
>small size solar panels. (If anyone in NZ / Oz knows a better value small
>panel please advise.)  7 or 8 of these in series would provide a 7 watt 12
>volt panel - eg suitable for recharging your laptop during a weekend / week
>at the beach (get a life).


In my very limited experience, if they are advertising 2 volt 500mA cells,
they *usually* mean that the cells produce 2 volts OPEN CIRCUIT (ie,
current = 0) OR 500mA SHORT CIRCUIT (voltage = 0) but not both at the same
time. If so, then you won't get anything like a watt out of them.

Of course, I could be completely in the dark regarding these particular cells.

Best regards,
Tom M.

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'[AD]: Solar cells - NZ & Australia only'
2002\02\01@112224 by electme
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face
russell,
thats just over their wholesale prices
10-19 units @ $10.92e + gst
its easy to set up a wholesale account with them
glen
=========


2
At 11:14 am Friday 01/02/2002 +1300, you wrote:
{Quote hidden}

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2002\02\01@144609 by uter van ooijen & floortje hanneman

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> In my very limited experience, if they are advertising 2 volt 500mA cells,
> they *usually* mean that the cells produce 2 volts OPEN CIRCUIT (ie,
> current = 0) OR 500mA SHORT CIRCUIT (voltage = 0) but not both at the same
> time. If so, then you won't get anything like a watt out of them.

2 V open + 0.5 A short => 4 Ohm impedance, so max (external!) power is with
4 Ohm load => half the short current, haf the open voltage => 0.5 Watt.

Wouter van Ooijen

Van Ooijen Technische Informatica: http://www.voti.nl
Jal compiler for PIC uC's:  http://www.voti.nl/jal
PICs kopen? http://www.voti.nl/shop

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