Positive red wires is conductive with black negative wire. Is this an internal short?

[ZappBragagain]

How do you know if you have a short in your inverter/microinverter?

I was testing the conductivity of one of my microinverters and the black negative wire toning to both the black and red connectors. Does this indicate an internal short?

What is also strange is that I would move it around and it would stop then I would move it around some more and it would start again.

I tested a different microinverter and it did not do this.

This is a microinverter I just got in the mail yesterday and I have never used before. Does this sound normal or like its a defect?

Thanks.

 

[quantum`]

It's not bad depending on where you're testing. If you're testing where there's a transformer or toroidal it's fine. Otherwise no.

But it is not normal to have an intermittent connection.

 

[ZappBragagain]

It's not bad depending on where you're testing. If you're testing where there's a transformer or toroidal it's fine. Otherwise no.

But it is not normal to have an intermittent connection.

I'm testing on the BIG RED and BLACK inputs from the outside.

Nothing is taken apart. I am not looking at the motherboard or anything. Just from the outside, the RED and BLACK seem to have a connection with my toner.

Meaning a signal on the black is able to make it to the red but not vise versa.

What does this mean?

 

[quantum`]

It means get a refund. The newer micro is defective. This is clearly why they've sold it on to someone who could be less the wiser.

And give them bad feedback. (after the refund)

 

[mciholas]

Maybe nothing. The circuit design might be such that it doesn't unshort the input until it has AC to work with, or something like that. What does it measure in ohms?

The question is, does the microinverter actually work? Does it measure differently than others of the same kind?

Mike C.

 

[quantum`]

Remember though mc, he has an intermittent...

 

[Brett V]

Did you reverse the leads on your meter and try it again? There might be a diode across the input. Could be a capacitor there too. When you said toner, I assume you’re using a multimeter on the continuity setting?

 

[crossy]

The acid test is of course, does it actually work? Give it grid and a panel and test.

You could be seeing a reverse-polarity protection diode.