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diy solar

12vdc solar controller seems to work but not charging ?

turbo1600

New Member
Joined
Feb 4, 2024
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2
Location
renmark , south australia
how come my solar panel out put is 30vdc in full sun , without it connected up to the controller , but when i connect it up to the controller and measure the voltage at screw terminals where panel feed goes in it reads 12.6 vdc . lead acid battery is connected . it was working perfect with the same type controller , but the battery symbol had no lines in it.. ( charging state ?) so i replaced it now this is happening.

see video : https://youtu.be/WjdAgFDuULs
 
Might help to move the battery positive cable to the battery positive connection on the solar controller, not the load positive connection.
That might fix your problem. ;)
1707042322174.png
 
AH! Damn camera angle. 😆
Can you give us some more info on the panel you're using?
That 30v should be VOC, but it shouldn't drop that much once connected....
And the model of the solar controller, maybe we find a manual for it?
Could possibly be a setting is wrong.
 
solar panel out put is 30vdc in full sun ,
You have a PWM controller, in simple terms this type of controller connects the panel to battery, allowing current to flow, but is 'pulling down' panel volts to battery volts. Thus you will see just over battery volts at the input.
Since you only receive panel current in the battery , where a high voltage panel is used, a large percentage of possible panel power is lost. In your case with a 30 volt panel and a 12v system you are getting less than 50% of possible power.
Much better performance is possible using a more expensive MPPT type controller.

If the battery volts are not slowly increasing either the panel or controler is faulty. Even if a panel delivers volts its possible that faults within the panel or cables/connections exist. Flexible panels often have this type of fault.
 
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Based on the image of the SCC it does not look like you have an input (no arrow between panel and battery) from your solar panels. Since you have a voltage from them but no current when wired to SCC you would want to check all your connections to make sure there is not a loose one. Alternatively you might have a faulty SCC.
 
Based on the image of the SCC it does not look like you have an input (no arrow between panel and battery) from your solar panels. Since you have a voltage from them but no current when wired to SCC you would want to check all your connections to make sure there is not a loose one. Alternatively you might have a faulty SCC.
Watch the OP video. It appears there is power flowing. Mismatch between panel and system voltage is an issue,
 
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