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Help! What's wrong with my 12v Solar Charger? - Page 2

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Posted by Russ in San Diego on October 7, 2008, 2:34 pm

Why the heck would you want to discourage someone from learning things
for themselves???  You do NOT need to have a college degree to work
with this stuff.  You DO need to learn more electrical and electronics
theory, though.

Tonedef, if your goal is simply to charge a few devices with a solar
panel, then you would probably be better off purchasing one.

If your goal is to learn something about electronics and using solar
power, then by all means, go ahead.  Apparently, you shouldn't expect
much encouragement here, though.  Go start googling for information on
building a solar charger.  Go to the library and get some books out on
basic electronics and electrical theory.

The problem is probably that your devices are drawing more power than
your panel generates.  What is the rating of your panel in watts, and
how much power do your devices draw?  In general, you're better off
running a panel into a battery, and then connecting your appliance
chargers to the battery.  The battery can accumulate a charge and can
dispense higher power levels (but only for a short time).  In other
words, your charger can accumulate, say for 5 hours at 5 watts,
yielding 25 watt hours.  It can then dispense at 10 watts for 2.5
hours (less, actually, since there are losses in the battery).  You
would also want to eventually add a charger circuit to your project,
to avoid overcharging the battery.

It's not rocket science, but you do need to do some research and

Posted by Eeyore on October 8, 2008, 8:43 am

Russ in San Diego wrote:

READ MY LIPS (or words)

"You're (going to) need to learn some more" - [correction added]

I believe the word LEARN was in there.

Now what's YOUR problem ?


Posted by Eeyore on October 8, 2008, 8:44 am

Russ in San Diego wrote:

Eh ? I did a 100% worked example.

And NO I WON'T encourage people to use PV solar for inappropriate tasks.


Posted by yoyo on October 8, 2008, 2:31 am
 On Mon, 06 Oct 2008 09:12:18 -0700, tonedef wrote:

Do you have any other specs on the panel such as wattage or current?  How
about the dimensions of the panel in order to guess its power?

What is the wattage/amps draw of the devices you are charging?


Posted by Eeyore on October 7, 2008, 10:34 am

Mauried wrote:

The 'resting voltage' of a 12V battery should actually be around 12.6V.

His solar panel could conceivably be DISCHARGING the battery .


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