help required, 2x12 Volt solar panel to charge 12 v battery

[amitlagu]

I have connected 2 solar modules of 12 v output in series connection (resulting in 24V output) & fed to non isolated to DC-DC converter to give o/p of 12v. Before connecting to converter modules shows o/p 30 v. But when i connect it to converter then suddenly modules voltage comes to 15 v. One solar module shows o/p of 15v & another shows only 1.2 v. Can you halp me here?

 

[bongkk]

If the panels are connected correctly, either the panel that gives 1.2 volts is faulty or it is shaded from the sunlight. I would test it individually with a 12V car bulb to make sure.

 

[amitlagu]

Re: help required, 2x12 Volt solar panel to charge 12 v batt

hi, thanks for reply. I also tried with individual panel. Each giving 800 ma output if used individually. But in series application problem occurs. Both panels are in sun light.

 

[karesz]

Hi amitlagu,
are there from same producer/same types?
K.

 

[amitlagu]

Re: help required, 2x12 Volt solar panel to charge 12 v batt

yes they are of same type & same batch

 

[hameeds01]

Re: help required, 2x12 Volt solar panel to charge 12 v batt

use bypass diode with each panel

 

[nikhil_damle]

Re: help required, 2x12 Volt solar panel to charge 12 v batt

if u need the output of the solar pannel to charge the circuit then use a 12V + regulator before your application circuit. the use of bypass diode can be a good option