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okaypol

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Posts: 2
Reply with quote  #1 
I have multiple types of solar panels...I really thought hard about this but have no real idea if the current connection is right or wrong!
 
Please Help me if possible
I have:
12, 5v, 140 mah Panels
3, 9v, 31 mah Panels
6, 5v, 0.06mah panels
2, 5v 81mah panels

The 9v 31mah solar panels came with a cable that outputs 5.40 volt which I measured... I connected two of them in parallel + to +, - to -
 
Please tell me how should I connect them together to get the highest efficiency?

Parallel or serial or mixed? O.o?!
I'm charging a 5v 2.1A battery with them currently
Thank you so much!

stmbtwle

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Reply with quote  #2 
How you connect them "Parallel or serial or mixed" depends on what you want to do and the voltage you need.  IMO "efficiency" is meaningless until you find a use for them.



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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
okaypol

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Posts: 2
Reply with quote  #3 
I want to connect them to a 5 volt battery with a 2.1 A input .

Thank you for your help! 

PS: I don't know if series would be good or all mixed?
stmbtwle

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Reply with quote  #4 
12 x 5v in series would give you 60 volts.  More than enough to give you a good tickle, and probably ruin the battery (it might even explode).  You could connect them in series-parallel for 10v, but it would probably still overcharge and wreck the battery.

https://www.allaboutcircuits.com/textbook/direct-current/chpt-7/what-is-a-series-parallel-circuit/

Simplest thing would be to connect all the 140ma panels in parallel and hope for the best.

Better would be to connect them in series-parallel for 10v, and then connect them to a buck regulator, and adjust the regulator to the desired output voltage:
https://www.ebay.com/itm/Adjustable-DC-DC-LM-2596-Converter-Buck-Step-Down-Regulator-Power-Module-LW-SZUS/181944416012

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #5 
It would help if you tell us more about the battery. It sounds like a battery pack for a phone.
Better information on the Solar "panels" would be helpful also.


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #6 
My thoughts too.  A phone or possibly a tablet or other USB-powered device.  I think they all run on 5v.  

It would be good to determine what the actual output voltage of these "5v panels" is. 

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #7 
You can get 1A Li-ion charger modules for 99ยข. Input range is typically 4.5 - 5.5V output is a USB connector. Need more current, stack them.
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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