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charge battery with solar panel

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knarf.be:
Hi,

I want to charge a 6v lead battery with a solar panel.
Specs solar panel:
5w (Voltage drops to 4v)
Voltage max in sun 9.5v
Voltage in shade 8-9v
Battery specs:
4 Ah
6vLead sealed

What is the best option to charge the battery? I want a system with a verh low voltage drop, and im using a ge diode to protect the solar panel.
Currently I'm planning to use a lm7807 low drop and diode, vin is 7.5 and higher, vout is 6.6v.
Anyone other ideas? Please let me know

SeanB:
1A Shottky diode in series with the panel and connect across the battery. 5W panel will not overcharge the battery, it does not put out enough to drive the battery to the point where it will generate gas. It would be better to use a second panel in parallel to increase the current though, the panel is just too small to get any useful power out of it.

commerou:
Hi
I want to charge a 12v lead acid battery with a 12v 13w solar panel, do I require any kind of circuit or could I just hook it straight up?
 

knarf.be:

--- Quote from: commerou on March 12, 2013, 08:27:54 am ---Hi
I want to charge a 12v lead acid battery with a 12v 13w solar panel, do I require any kind of circuit or could I just hook it straight up?

--- End quote ---

You always need a diode, and thanks to seanb, I know now it has to be a Shottky.

But for 12v you better use a cheap off the shelf charger. (These aren't available for 6v) Just look on ebay.
As far as I know it will destroy your battery without a descent charging circuit.

Kevin.D:

--- Quote from: commerou on March 12, 2013, 08:27:54 am ---Hi
I want to charge a 12v lead acid battery with a 12v 13w solar panel, do I require any kind of circuit or could I just hook it straight up?
 

--- End quote ---

Depends on the capacity of the lead acid battery .But for a car battery size (~60Ah) you can usually leave upto 10 Watt's max size panel on permanently without a regulator , but for  13 Watt panel I would use a regulator if it's conected permantley to prevent overcharging

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