"ian field" <dai.ode@[EMAIL PROTECTED]
> wrote in
news:sbU7k.69776$8k.12981@[EMAIL PROTECTED]
>
> "Kris Krieger" <me@[EMAIL PROTECTED]
> wrote in message
> news:HN6dnUa5Bpt2esLVnZ2dnUVZ_h3inZ2d@[EMAIL PROTECTED]
>> Apologies in advance if this is a dopey question, but, when it comes
>> to recharging batteries, and using a solar cell to do that, what I've
>> been assuming, based on th info that peopl ehere have kindly
>> provided, and also that I've foind on-line, is that teh mA output of
>> the solar cells should not exceed 2/10ths to maybe 3/10ths of the
>> battery's mA rating, and teh voltage produced by the solar cells
>> should be as close as possible to the total voltage of the battery or
>> batteries. But I wanted to check whether that assumption is correct,
>> becasue I think I'm getting closeto getting some parts and trying a
>> couple of assemblies.
>>
>> Thanks In Advance!
>>
>> - Kris
>
> There are a few suppliers that sell solar scavenger panels for
> charging vehicle batteries while parked outside the workplace, there
> are certainly car ones that sit on the dashboard and possibly
> permanent one's that can be bonded onto the roof, I believe there are
> also motorcycle types available.
Not my applications - yet! INteresting to know, tho'. If I can actually
pull off this lighting project, it will be a good springboard, I think,
to learnign moer about otehr Solar options and how to implement them.
((Tho' for a whole-house system, I'd hire a pro <g!>))
>
> If you make a home brew panel, don't forget you need a blocking
> rectifier to stop the battery discharging into the solar cell when
> there's no sunlight and the forward volt drop of the rectifier has to
> be taken into account when specifying the solar panel voltage.
>
All the circuit diagrams I've looked at (this is for solar accent
lighting, but much brighter than what is usually available) seem to use a
diode as tha "backflow regulator", which I think <?> might be what you
mean?, unless one is looking at the circuits that have integrated
battery management - tho' I don't yet really understand how one uses
them, i.e. how to go from "sensing a full charge" to actually bleeding
off or shunting away any additional power - tho' I'm still going through
data sheets.
Ideally, I'd like an IC that not only senses whenthe battery is full, but
also switches the input either off, or into a "bleeder" circuit (or just
back inot the Ground).
- Kris
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