solar charge controller - Fiberglass RV


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Old 08-01-2017, 07:15 PM   #1
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solar charge controller

I have this charge controller... http://www.hqsolarpower.com/v/vspfil...CTRL-30LCD.pdf

Interesting thing is when I disconnect the panels (switch on the pos wire), I get a reading at the controllers panel terminals of 1.7v

Can anyone explain this? It's showing no amps delivered, as it should, but where is the 1.7 volts coming from? The controller?
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Old 08-01-2017, 10:44 PM   #2
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Originally Posted by Sparky0 View Post
I have this charge controller... http://www.hqsolarpower.com/v/vspfil...CTRL-30LCD.pdf

Interesting thing is when I disconnect the panels (switch on the pos wire), I get a reading at the controllers panel terminals of 1.7v

Can anyone explain this? It's showing no amps delivered, as it should, but where is the 1.7 volts coming from? The controller?
The voltage is coming from the house battery. If were able to look at where the wire goes into the panel you'd find a diode. Solar panels without diodes will run the battery down at night. A diode in one of the lines (Kirchoff's law indicate it doesn't matter which line as long as it'f point in the right direction) will stop the two way street to and from a solar panel.
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Old 08-02-2017, 12:35 AM   #3
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Yes, I've heard of that. How does the voltage run back to the panel with the positive panel wire disconnected?
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Old 08-02-2017, 12:44 AM   #4
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wait. I get it. the voltage will still show across the controller terminals even if the panel is isolated.
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Old 08-03-2017, 03:41 AM   #5
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Because a voltage shows does not mean current is flowing.
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Old 08-03-2017, 07:58 AM   #6
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a little disappointing as this controller is supposed to have "night time reverse charge protection"
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Old 08-03-2017, 08:27 AM   #7
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Most solar panels have built in blocking diodes.
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Old 08-03-2017, 08:38 AM   #8
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Most solar panels have built in blocking diodes.
This is true, I think I have a non-issue here. Thanks for all your replies.
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Old 08-04-2017, 09:30 AM   #9
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got a response from the manufacturer.

"The controller does have protection against back feeding, as for the voltage at the panels terminals that is normal there will be surface voltage at the screws but no current. "
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Old 08-05-2017, 08:12 AM   #10
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Capacitors in controller sir!
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Old 08-05-2017, 08:38 AM   #11
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Capacitors in controller sir!
Of course. I hadn't thought of the capacitors.

Thank you
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