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Old 21-12-2012, 09:07   #1
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Problems in connecting the solar panels

Hello my friends
I am happy to be joining you on this site, I study electrical engineering and I wanted to get to know more on solar energy so I bought solar cells through eBay site 1.8 watt 0.5 for each cell

then I'm making Four solar panels, each panel give me 65watt , 18volt , 3.6a
after that I connect the four panels together and gave me a 72-volt

Then I bought 10A PWM Solar Charge Controller Regulator for 12V 24V PV solar system

Can I connect this device with the four solar panel .and will he converts 72 volts to 14 volts in order to charge the battery???

please help me ,and If there are other ways to connect four solar panels to charge the 12v battery please tell me
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Old 21-12-2012, 09:16   #2
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Re: Problems in connecting the solar panels

To get the 72 volts down to 14 volts and retain all the power available you'll need an mppt controller. The average PWM controller won't do what you ask of it. It may be able to pass the current, but it will chop the voltage to do so, so in essence you'll pass 14v but only 3 amps or so.

What are the specs on the PWM controller you bought?
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Old 21-12-2012, 09:43   #3
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Re: Problems in connecting the solar panels

Thank you Sailmonkey for Speed ​​in a reply

this is the Specifications of the 10A PWM Solar Charge Controller Regulator for 12V 24V PV solar system that I'm buying

(Model cmp12 , rated voltage Dc 12v/24v , Max current 10A ,Full charge cut 13.7v/27.4v, low voltage cut 10.5v/21v

Can this device conversion from 72 volts to 14 ?

I could remove the four solar panels from each and make every board alone if you have any other ideas to get the total energy of the four panels and charging the battery as soon as plese tell me
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Old 21-12-2012, 09:54   #4
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Re: Problems in connecting the solar panels

I checked the specs on a website I found for that thing. As near as I can tell, you'll need to wire your panels in parallel rather than series for a total output of 18V @ 14.4 amps. This will work, but I have a hunch you'll fry that controller if your batteries are every deeply discharge in the full bright tropical sun. If it was me I'd be looking either for a 20 Amp PWM controller or a 20 Amp Mppt controller.


is this link the same as your controller?
HARBIN HOPEFUL STAR CO.,LTD.
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Old 21-12-2012, 10:22   #5
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Re: Problems in connecting the solar panels

Thank you Sailmonkey for Speed ​​in a reply

Yes this is the same device that I own ,
This is a nice idea.But I did not see one linked in parallel before. Did you write me how to linking in parallel
Can I use only 3 panels and connect them in parallel for 10.8 AMP؟

and Iam having only one 90A,12v car battery .Can you tell me how long it will take until filled, and did will you keep powered for a long time because the solar panel battery is so Expensive
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Old 21-12-2012, 10:48   #6
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You can hook all the panel + wires together, and all the panel - wires together to parallel them, then hook the positive wires to two controllers and the negative wires to two controllers to handle the maximum current from two panels. Not perfect but should work.

Or simply remove two panels from the system. But with three panels you're still awfully close to burning the controller.

65 watts X 4 panels = 260 watts.

Assuming a batt voltage of 12.8 volts means you'll be pushing 20.3 amps under ideal conditions. (260/12.8)=20.3.
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Old 21-12-2012, 12:20   #7
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Re: Problems in connecting the solar panels

Thank you Sailmonkey

I think I will buy another device will be 20 AMP because I have to get the full energy of the four panels , I want to ask you about the diode how many AMP should be in this case
because I have 6A diode

THANK YOU FOR HELPING ME
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Old 21-12-2012, 12:31   #8
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Re: Problems in connecting the solar panels

Are you looking for the blocking diode on each solar panel? If you have four panels each with their own diode then the 6 amp diode is OK as each panel is only going to make 5 amps max.
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Old 21-12-2012, 12:38   #9
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Re: Problems in connecting the solar panels

thank you Sailmonkey
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