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Solar to 12 volt car adaptors

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Posted by damienirvine on June 10, 2007, 10:40 am
 
Hi,

I have 2 solar panels outputting up to 20 (ish) volts and would like
make a solar recharge unit. I do not want to use a 12 volt battery, as
there is no need for this weight.

Ideally, I would like to charge AAA, AA, D and C size batteries using
one of the many generic battery changers that plug into the car
lighter.  This will allow me to charger my torch batteries for use in
the night (yes a camping device), and other phone chargers.

So I would like to know what I need in terms of circuitry to set up 2
female cigarette lighter sockets directly to the 2 solar panels if
they both provide greater than 20 volts and 100mA, then in reduce sun
the voltage will drop and I still do not want to waste too much power
if possible without a larger storage battery.

Remembering that I would like to use any commercial charger designed
to work of a cigarette lighter socket in a car.

Thanks Kindly


Posted by Solar Flaire on June 10, 2007, 10:17 pm
 
Usually, and maybe weight/size prohibitive, the solar panels charge
the first set of batteries and then charge the mobile batteries (AA,
AAA C, D cells) from them. This way you can charge your mobile set
quicker and almost always have rechargability available.




Posted by Everybody! on July 6, 2007, 6:39 am
    Not knowing what the maximum current output on the panels are puts
a wrinkle on a definitive answer.  My charger states it will accept
anything between 11 and 16 volts.  The "20(ish)" volt output would
place the panels outside the acceptable input voltage but there's a
very good chance that the demand of the AA charger would drag the
voltage down quite a bit and it would work.  hook up a decent digital
voltmeter to the panel(s) and BRIEFLY connect the battery charger with
battery or batteries in place ready to be charged.  Observe the
voltage and make sure it still falls in the acceptable range for your
charger.
   Mine is a 15 minute rapid charger complete with cooling fan and it
sucks up quite a few amps.  I'd imagine some of the standard duty
chargers would work quite satisfactorily on your panel(s).  let us
know how it turned out.  I, for one, would be interested to be kept in
the knowledge loop.

   You get what you INSPECT. Not what you EXPECT!


On Sun, 10 Jun 2007 17:17:07 -0500, "Solar Flaire"



Posted by IR on August 1, 2007, 6:36 pm
 I was looking at car chargers for aa aaa, etc. on ebay and they are
all fast chargers which use a lot more power than those solar panels
put out.  I guess they figure you want your batts charged before you
get there.  Question that occurs to me is can the chargers work on
low power?

damienirvine@idomain.com.au wrote:


Posted by Morris Dovey on August 1, 2007, 7:09 pm
 IR wrote:
| I was looking at car chargers for aa aaa, etc. on ebay and they are
| all fast chargers which use a lot more power than those solar panels
| put out.  I guess they figure you want your batts charged before you
| get there.  Question that occurs to me is can the chargers work on
| low power?

There's an easy way to find out...

Please let us know if/how well it works. :-)

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



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