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Old 25-07-2016, 11:23   #1
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Multimeter Probes in an MC4 plug Solar Voltage

I'm trying to test my 30 watt solar panels with attached MC4 plugs, with the test probes that came with the multimeter.

The voltages jump around and results in a reading of "1".

Sometimes ... for an instant, I'll get a reading of 18+volts, before the meter goes to "1".

If I go into the connection panel on the solar panel, the reading is a constant 18+ volts.

Are MC4 plugs generally hard to get readings from without a special adapter?

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Old 25-07-2016, 11:54   #2
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Re: Multimeter Probes in an MC4 plug Solar Voltage

Try increasing the scale of the meter (200 volts)
The panel may be above 20 volts


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Old 25-07-2016, 12:19   #3
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Re: Multimeter Probes in an MC4 plug Solar Voltage


Some plugs are not easy to test with plain probes. I had the same problem testing our waterproof plugs.

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Old 29-07-2016, 00:55   #4
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Re: Multimeter Probes in an MC4 plug Solar Voltage

if you are trying to test things in your system you can get an mc4 Y or splice thing. that will free up one port to stick your probe in. just insert into panel wiring durring testing. not permanent

trying to stick a probe it into the side of a waterproof mc4 doesn't seem to great.

but unless you are trying to trouble shoot an issue in the panel wiring then I would just measure at controller....
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plug, solar

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