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Old 06-17-2024, 08:32 PM   #1
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Voltage from solar panels

Have a Renogy system. Prior to this trip used a 100 watt solar panel, everything worked fine. Purchased a second panel along with the connectors to put them in series. The system does not work.

Dumb question, but should I be able to measure the voltage coming off the two panels at the connection to the controller. I tried checking all the fittings etc. but still got 0 volts when I tried to measure. I don't know enough about solar to understand if that is even the issue.

The controller lights are all correct. I did notice that the 40 amp circuit breaker (I replaced the 40 amp fuse) was clicking about every 10 seconds when I hooked up the system to the solar connection on the frame.

Any guidance would be appreciated.
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Old 06-17-2024, 08:41 PM   #2
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I don't think they should be in series? Shouldn't they be in parallel?
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Old 06-17-2024, 09:34 PM   #3
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Thanks, could be my ignorance. I have 2 panel. I connect the first panel to the second panel. Then, I connect to the controller. I thought that meant they were in series, but not my expertise. This is the way Renogy says to connect two panels.
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Old 06-17-2024, 10:32 PM   #4
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Very easy to test a solar panel. See the attached.
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Old 06-17-2024, 10:41 PM   #5
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2 panels should be in parallel which is most common. That means they are across each other rather than inline with each other. Series could work but if you have a bad panel your output would be zero.
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Old 06-17-2024, 11:00 PM   #6
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Thank you. I will do this test tomorrow if there is sun. I connected one panel to the other panel and then connected to the Controller. Since Renogy supplied the connectors I don't think there is a polarity issues since each wire connector only plugs into "one connection." Now I am wondering if one of the panels is bad. Guess I need to go back to my basic electronics book to understand series vs. parallel .
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Old 06-18-2024, 08:33 AM   #7
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Your panels should be connected in parallel, not series as it sounds like you did. You should be using a set of Y connectors that look like this to allow for two panels to be connected in parallel.
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Old 06-18-2024, 08:40 AM   #8
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Thank you. Those are the exact connectors I have. My mistake line in defining series vs. parallel.
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Old 06-18-2024, 12:39 PM   #9
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For reference, hereís a simple two panel diagram for double-checking your connections.
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