Solar charger

M

masab

New Member

• May 24, 2010

• #1

i have built a solar cell phone charger circuit using many solar cells They provide 36V/1.5A at maximum,
but when i connect the regulator IC 7806, the current and voltage of the cells drop to 8V/300mA, when i connect the mobile to charge they further drop to 4.7V/200mA,which slows the charging process.........whats the problem,why does the power drop soo much?

 

MikeMl

Well-Known Member

Most Helpful Member

• May 24, 2010

• #2

What is the rating on a single solar cell of the type you are using?

You likely need to connect your cells in a series-parallel configuration.

 

Last edited: May 24, 2010

S

swallow_159

New Member

• May 24, 2010

• #3

I think masab can get savory voltage an current from solar cell but when want use in circuit it drop

 

M

masab

New Member

• May 24, 2010

• #4

there isnt any rating on those solar cells...they r just the size of ur smallest finger...and approx 5cm wide...i have 12 of them and connected them in series with an IC7806...does the IC cause the source voltage and current to drop?

 

M

mneary

New Member

• May 24, 2010

• #5

Twelve solar cells "the size of your smallest finger" are not likely to generate 36V at 1.5A. It is more likely that they produce only 1.5mA.

 

C

colin55

Well-Known Member

• May 24, 2010

• #6

The cells you have are either 100mA or 200mA. But this current is only available when the sun is shining very brightly.
Normally you will get about 50 to 100mA. Each cell produces about 0.5v So 12 cells will produce 6v.

 

audioguru

Well-Known Member

Most Helpful Member

• May 25, 2010

• #7

When the voltage regulator is connected with its pins wrong or with the input and output capacitors shown on its datasheet missing then it draws a high current.