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Post Info TOPIC: MC4 Branch Connector question


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MC4 Branch Connector question


Can someone advise how/where these mc4 connectors would be used.

They do not appears to be the usual arrangement of connectors.

IMG20260512171246.jpg

 

 

 



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I have those sort of connectors for solar input into the Ecoflow battery that I have. I admit it is the only place I have seen them. Male & Female connectors are readily available from Battery World locally to make your own leads up.

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You can use those 3 way junction anywhere you need to go down from two input to one output.. They are just common connectors, one goes to male the other goes to female...



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Maybe this picture will help...

 

IMG20260512171246.jpg



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Guru

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I would like to see a wiring Flow Chart of using these branch connectors with 4 solar panels connected in parallel to a solar controller.



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Cheers, Richard (Dick0)

"Home is where the Den is parked, Designer Orchid Special 21' towed by Jeep Diesel Grand Cherokee Limited"

"4x250W solar panels, 360w solar blanket, Epever 80A charger and 4x135Ah Voltax Prismatic LiFePO4 Batteries".



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Dick0 wrote:

I would like to see a wiring Flow Chart of using these branch connectors with 4 solar panels connected in parallel to a solar controller.


 Are you talking to me?



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Senior Member

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With 4 panel you just need to double what's in this picture. You then add another two of those connector and you are back again down to 2 wires only ... It is a very common connectors and they come in different size and polarity to accommodate most situation of installation..

 

multibranch connectors.jpg

 

 

 

 



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Guru

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Burt65 wrote:

With 4 panel you just need to double what's in this picture. You then add another two of those connector and you are back again down to 2 wires only ... It is a very common connectors and they come in different size and polarity to accommodate most situation of installation..

 

multibranch connectors.jpg

 

 

 

 


Thanks Burt. I assume that 4 panels in parallel you would need 5 branch connectors prior to connection to solar controller.

There are many different types of branch connectors and what can be confusing is the configuration of the adapters.

The example, the one the OP provided, could be confusing to some. Initially, I was confused with some of these connectors when setting up solar several years ago.

Once I located the connectors, as shown by you, all fell into place as your flow chart shows.

Perhaps the OP will understand the different branch connectors now.



__________________

Cheers, Richard (Dick0)

"Home is where the Den is parked, Designer Orchid Special 21' towed by Jeep Diesel Grand Cherokee Limited"

"4x250W solar panels, 360w solar blanket, Epever 80A charger and 4x135Ah Voltax Prismatic LiFePO4 Batteries".



Senior Member

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Posts: 144
Date:

Dick0 wrote:
Burt65 wrote:

With 4 panel you just need to double what's in this picture. You then add another two of those connector and you are back again down to 2 wires only ... It is a very common connectors and they come in different size and polarity to accommodate most situation of installation..

 

multibranch connectors.jpg

 

 

 

 


Thanks Burt. I assume that 4 panels in parallel you would need 5 branch connectors prior to connection to solar controller.

There are many different types of branch connectors and what can be confusing is the configuration of the adapters.

The example, the one the OP provided, could be confusing to some. Initially, I was confused with some of these connectors when setting up solar several years ago.

Once I located the connectors, as shown by you, all fell into place as your flow chart shows.

Perhaps the OP will understand the different branch connectors now.


 

For 4 panels in Parallel you actually would need 6 Y connectors to get down to the single (double wire) on your way to the MTTP 

Lots of people get confused because they look at those connectors (the wired ones) and they presume that they can only be used as the double ends are in and the single end are out.. But that's simply not the case.  That's why I added the first picture that does show one of the correct configuration with the ins and outs...

The wired ones are actually stronger than the one piece plastic one. Also when you break a retaining clip in the plastic one you need to replace the entire block where with the wired ones you could simply replace the broken end with the damaged retainer clip... They are very handy when you have panels spread out on a roof of your vehicle, and they are used in both serial and parallel, to work out the best suitable voltage for your MPPT. They also allow you to run only two cable to individual pair, or individual group of panels, no matter where or how far they are, instead of having to run several cables to a bus bar to then go just with two wires to your MTTP...



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Guru

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4 way connectors are available.

In my new build, I will taking each solar panel to its own (smaller) controller. 

The cost of solar controllers is relative to their capacity, so 4 x small ones cost is not much more than 1 x large one.

That provides better partial shade performance and redundancy protection in case of failures.

Cheers,

Peter



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