Re: Most efficent way to keep battery charged with solar panel ?
From: Rene Tschaggelar (none_at_none.none)
Date: 01/17/04
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Date: Sat, 17 Jan 2004 21:23:22 GMT
Anton Erasmus wrote:
> Hi,
>
> I have a device that needs to run 24/7 away from any power source. It
> can run off a 12V supply and I want to use a 12V battery that will be
> charged during the day via a number of solar panels. As far as I am
> aware both the voltage and current of a solar panel may change
> depending on the sunlight intensity. What is the best way to charge
> the 12V battery at 13.8V from the minimum number of solar panels ?
> Some of the circuits I have seen are simply a number of solar panels
> in series connected to the battery via a diode.
Not recommended.
When the ambient temperature drops, the open loop voltage of
the solar panel rises. You can overload a battery this way,
reducing the battery lifetime considerably.
Opt for a regulator.
Rene
-- Ing.Buero R.Tschaggelar - http://www.ibrtses.com & commercial newsgroups - http://www.talkto.net
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