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Author Topic: Mc3/4 connectors  (Read 3292 times)
steve
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« on: June 26, 2019, 10:11:25 PM »

Hi there, I am looking for some advice on connectors. I bought 30 second hand panels a few years back and have had them stored in my shed since! I know ,not generating much power in there!
My question is would it be advisable to change the connectors?
Would there be corrosion in the connectors after all this time ?
Cheers Steve
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Solarchaser
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« Reply #1 on: June 27, 2019, 12:22:51 AM »

You would really have to be the judge of that to be honest.
Shine a torch into the connection and look for corrosion.

You can buy bags of 20 mc4 connectors for around £20 iirc from fleabay if you doubt their integrity.
Remember you will have to buy a crimper also at around £15
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nowty
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« Reply #2 on: June 27, 2019, 05:44:01 PM »

If they are ok on an exposed wet roof for 25 years, I am sure they will be ok in a shed for a few years.
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12kW+ of PV installed and 57+ MWh's generated.
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Scruff
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« Reply #3 on: June 28, 2019, 03:01:05 PM »

One is locking, thuther is not.
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Nickel2
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« Reply #4 on: June 28, 2019, 10:46:11 PM »

MC4 connectors have weather-proof seals, with o-rings and a thin smear of lube, that when plugged together are fairly well proofed against the weather. The standard MC4 is IP67; ie, moisture/dust/spider etc-proof. MC4 and MC3 connectors are not inter-connectable.
If they have been shed-stored but not connected together or to each other, I'd replace them. Like Solarchaser says, new crimps, tool and fastenings are quite cheap. Watch several yootoob 'how to do it' videos, and learn by the actions of others. It's not difficult  Smiley
MC4's are the current item of use, that most solar-'boxes' have for connection, I'd do it as a matter of course.
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1.140kW mono south-facing at 49*
EpEver 4210A at 24v
Nearly dead 24V 400 Ah battery. (4x200Ah FLA)
EpEver STI1000-24-230 pure sine inverter
Of course it'll work. (It hasn't caught fire yet).
merkland
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« Reply #5 on: June 29, 2019, 10:32:06 AM »

Itís surprising what a judicious squirt of WD40 can do to help!

Merkland.
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Nickel2
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« Reply #6 on: June 29, 2019, 03:41:53 PM »

Not so sure about WD40 in electrics. Is the solvent ok with plastics and connector seals?
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1.140kW mono south-facing at 49*
EpEver 4210A at 24v
Nearly dead 24V 400 Ah battery. (4x200Ah FLA)
EpEver STI1000-24-230 pure sine inverter
Of course it'll work. (It hasn't caught fire yet).
Iain
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« Reply #7 on: June 29, 2019, 03:48:29 PM »

Hi
When I did mine about 10 years ago I used the red rubber grease on my MC 3 connectors. When I rejigged my panels a couple of years ago all was perfect. As they twisted to come apart there was still a thin smear of grease and the contacts looked perfect.

Iain
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steve
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« Reply #8 on: June 29, 2019, 10:04:41 PM »

Ah brilliant thanks for the advice. I think I will change then. Will be easier to do now than have a problem later 👍
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Nickel2
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« Reply #9 on: June 30, 2019, 08:16:06 AM »

Like Iain says, a thin smear of grease, on the sealing ring, not the contacts. New connectors straight out of the bag, are usually very lightly greased in the sealing area and do not require extra to be added.
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1.140kW mono south-facing at 49*
EpEver 4210A at 24v
Nearly dead 24V 400 Ah battery. (4x200Ah FLA)
EpEver STI1000-24-230 pure sine inverter
Of course it'll work. (It hasn't caught fire yet).
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