PV watts/volts drops as house load increases

Crowz said:

If your going to fix this yourself I advise getting the right tools together before tinkering with it.

You need a box of mc4 connectors (will need these to replace any bad ones).

Good wire strippers because you have to cut out the bad connector and strip the wire to install the new connector.

A good crimping tool to attach the metal ends that go in the mc4 connector housing.
This is what I bought but it shows currently unavailable.

Amazon.com

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offgridandy said:

Could be a bad connection, hope it is. I would still test stuff seperately. Just because a computer (inverter) says it is so don't mean it's true. Independant check with multi meter to confirm is a good way to go. But look for signs of burning around the MC4 connections, usually evidence is there to see. I assumed you had checked this first.

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bilalirfanpk said:

I just checked MC4 connectors and they seemed to be okay. I didn’t unclip them as I aint well versed in doing so. By the look of them, they look okay for now but lets see.

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bilalirfanpk said:

I just checked MC4 connectors and they seemed to be okay. I didn’t unclip them as I aint well versed in doing so. By the look of them, they look okay for now but lets see.

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Mattb4 said:

It is real difficult to spot a bad MC4 connection unless it melts.

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bilalirfanpk said:

What would be the obvious signs of a bad mc4 connectors then if not melted?

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Suijkerbuijk said:

Open it and see what its inside .
corrosion is one thing.
Have a new plug and see the color vs the old one.
Reason i have a lot of spare ones with me
I have this set.

https://www.amazon.nl/DEYMU-zonne-energie-krimpgereedschap-zonnepaneel-kabelstekkers-kabelaansluiting/dp/B0BPR3DB5K/ref=mp_s_a_1_1?crid=1Z7ZBPMVL01TK&dib=eyJ2IjoiMSJ9.laNRYQ9jqQhpT-Q7hTY4kJK-DtfT4euK6sLOTte-_iGG0yTRVmixNm1pPl2y6njZftDUAfn4aZ-hq4mvnAkAWwzE90K-rmMCxdxajaFK7HEwL88TtyAT4as5UYYNK2oxqDi02dMdrvoFxd46YKNBhcJXaiyC1oBy2sRUdfen1R1kiiz32-Ajf2Dpo4jSwHEhG2RxOAa-FzJZbEdp-_NUOg.lcHG6J0A023xdrac8WeekLEj-KAFisOYcOy39Mkspd8&dib_tag=se&keywords=mc2+krimptang&qid=1719330173&sprefix=mc2+krimptang%2Caps%2C182&sr=8-1

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Crowz said:

This was one I had fail last year.

View attachment 224524

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Crowz said:

This was one I had fail last year.

View attachment 224524

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bilalirfanpk said:

What would be the obvious signs of a bad mc4 connectors then if not melted?

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Mattb4 said:

As already mentioned you do not want to disconnect under load. When you do disconnect you are looking for oddities like contact spark burns and general corrosion. If you have a brand new MC4 assembly you can compare that to your old one. Also any difficulty with disconnecting could point to a problem.

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