10 replies to this topic

[ramblinChet]

delete

Edited by ramblinChet, 06 February 2024 - 08:51 AM.

[ckent323]

One approach is to use an SAE socket on the camper and then use an SAE to MC4 adapter to the Solar panel cables.   SAE socket is easier to plug and unplug than MC4.
 

 

Like this:

https://www.amazon.c...la-896671467249

and this:

https://www.amazon.c...2xpY2s9dHJ1ZQ==
 

 

Or you can use an MC4 entry gland like this:

 

https://www.amazon.c...,aps,187&sr=8-8

Edited by ckent323, 16 March 2023 - 12:25 AM.

[Jon R]

I don’t think MC4 connectors are intended for that type of use (regular make and break).

[alano]

Yes, I made this mistake and used MC4 for make/break connection. It didn't last so long. SAE socket or similar is a better choice. You might also consider an on/off switch so you don't spark across the connector - don't need if you connect before positioning panel in the sunlight.

 

Alan

[ckent323]

alano,

 

Good point.  A switch (or maybe a resettable breaker) is a good idea.  No point risking damage to the Solar Controller.

[Vic Harder]

I installed a trolling plug receiver on the camper in my Hawk build.  I cut off the MC4 connectors on my 50' cables and attached the matching plug. Worked great

[Stokeme]

I have long pondered the mc4 mount, below, as a solar socket roof replacement. A SAE plug tip(s) did crumble on my roof main cable. I replaced the plug. I’m afraid the same thing will happen (it will happen someday) on the roof SAE socket. The SAE plug & socket connection looks like pot metal. Replacing the roof socket will be a job.
Here’s the Renogy mc4 version I might use for the roof …
https://www.amazon.c...1132181388&th=1

With some reserve cable in the housing mount, the mc4 plugs can be replaced if needed. The plugs have that rubber washer making them near, or completely, weatherproof.
Vic’s mention of a trolling plug receiver looks to be a beefier alternative. Being non-electric, I’m not as familiar. I’ll research.

Edited by Stokeme, 17 March 2023 - 03:08 PM.

[ckent323]

Stokeme,

 

For one time connection MC4 connectors are superior to the SAE connector.  For repeated connect/disconnect/connect the SAE socket is the way to go but from a UV exposure and rain protection perspective I think it best mounted on a side wall or underneath a ledge.

I used a Gopower Solar entry plate.  It came with MC4 connectors on a short pigtail which made the install easier.

https://www.etrailer...r/34273840.html

 

I like the idea of the support for the cables to keep bending strain off of the connector interface (which honestly actually doesn't seem to be a high risk after having had ihtis in place since 2018).  I put a rubber grommet in the hole I cut in the metal roof to keep the sharp metal edge from cutting into the cable of time and I put 3m 4200 under the entry plate before screwing it down and then sealed the perimeter with a generous bead of 3M 4200.  No leaks.

I was able to tie the stripped ends of the cables into my 2007 FWC Keystone pre-wiring.  I installed a 2" x 2" junction box in the ceiling where the wires are connected.  Not necessary but it seemed like the best way to do it. since there was not much structure at that location.

I hope this is helpful.


Craig

Edited by ckent323, 20 March 2023 - 06:04 PM.

[ckent323]

FWIW I found the following on repeated mating/demating of MC4 connectors:

https://www.quora.co...r-inverters-etc
 

 

The Swiss company Staubli invented MC4 connectors.  Here is a link to their datasheet.

https://www.staubli....SOL-LVDC-en.pdf

 

 

On page 55 of the Staubli Photovoltaic Catalog (at the link below) says:

Mating cycles: The maximum of the PV connectors is 100 plugging cycles.

 

Unplugging under load: PV plug connections must not be unplugged while under load.

https://www.staubli....11014092-en.pdf

 

 

That info underscores

1) the need for a switch or at least covering the solar panel before disconnecting the cables

2) The MC4 connectors have a limited mate/demate life so best not to mate and demate them frequently.


 

Anderson, MC4 and SAE connectors are generally discussed in the following Wiki article (with some reference links):
 

 

https://en.wikipedia...ki/DC_connector

 

 

 

I hope this is helpful.

Craig

Edited by ckent323, 20 March 2023 - 06:34 PM.

[PaulT]

Re: Chet

 

No, but my experience with them has been that they are easy to break when separating them. I have never broken PowerPole connectors. The SAE flat connectors wear out or are deformed & must be replaced.

MC4 are connectors of choice for permanent connections where water proof connections are important. They are easy to install as are PowerPoles.

 

Powerpoles are easy to set up as polarized multiple conductor connections meaning you can’t plug them incorrectly. An advantage is that it is easy to choose the wire size required for the current being carried.

 

The SAE sockets are a pain to install and you need to have versions on hand where the wire size is appropriate for current carried because the connector is molded onto the wire.

 

I use all of them and make short adapter cables to go between circuits with different connectors as needed. My uses are biased by my need to be able to connect changing  devices for a short time for my ham radio hobby, but I have used each of these in my Hawk.

 

Paul