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'[OT]Solar Panels? Charge sealed batteries.'
D. Schouten wrote:
> Anybody ever messed around with a solar powered battery charger?
> I want to build a PIC controlled solar battery charger for charging
> big sealed batteries. Differently than just using some kind of shut
> off at a certain battery voltage, my plan was to incorporate some
> kind of a Maximum Power Point Tracker (MPPT) to get the max out of
> the solar panel array I have (approx. 1kW max). The MPPT controls
> a step down converter which is followed by a stepup converter for
> the final regulation of the battery charging voltage.
> A PIC could easily do the MPPT part in this app.
For a solar battery charger you can visit
You can also find general info on solar power at
it is the homepage of the homepower magazine, a nice one with lot of
info on solar and wind power. You can also download the whole magazine
since it is available on the net.
I've messed with them. I build them for Cathodic Protection Units.
Have about 200 to 250 units out in the field. For reliably I had to
keep the charging circuit simple. Just a switch mode shunt regulator.
How big are the batteries you are talking about?
---"D. Schouten" <XS4ALL.NL> wrote: daniels
DO YOU YAHOO!?
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>I've messed with them. I build them for Cathodic Protection Units.
>Have about 200 to 250 units out in the field. For reliably I had to
>keep the charging circuit simple. Just a switch mode shunt regulator.
Hmm, interesting. I was thinking to just use a simple non isolated
Buck converter controlled by a PIC. This way I can simply add a
charging algorithm and other stuff too. MPPT is accomplished
by simply adjusting duty cycle for maximum charging current. This
way the input PV module operates at his Maximum Power Point.
>How big are the batteries you are talking about?
It's a 24V 400AmpHour battery system.
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