Stress testing 12V Victron MultiPlus 3000 with EG4 LL batteries (heating issue)

[pabla007]

I just got answer from the supplier The maximum temperature for the wire is 140 Fahrenheit

 

[pabla007]

I think the wire might be getting hot because not enough air ventilation. Over the weekend I am going to run AC unit while it is not plugged into grid and monitor the temperature.

 

[pabla007]

-50°C to +105°C (-58°F to +221°F)

 

[740GLE]

You measured cable temps at 221f?

That’s the higest end of the insulation rating.

I’d investigate on what can be done to drop that down.

 

[pabla007]

i'm sorry that was the information was provided to me from the supplier regarding 4/0 cable. Operating temperature -50°C to +105°C (-58°F to +221°F).

 

[corn18]

My 4/0 with 320A going through it barely heats up above ambient.

 

[pabla007]

I was tracing every wire and notice my ground wire was not connected To RV trailer frame. After connecting ground wire and I notice my wire is not hot compared to last week.
Do you guys think it could be because of the ground wire was not connected to the chassis.

 

[pabla007]

I am thinking about re-crimp each end on 4/0 cable

 

[pabla007]

I think because I used cheap crimper that is one of the reason it is causing heat (AMZCNC Hammer Lug Crimper Tool - 0000 AWG Battery and Welding Cables( 8 AWG TO 4/0 Wire Gauge).

I just purchased following crimper to recrimp all of my wires (AMZCNC Hydraulic Crimping Tool - 12T Crimping Force, 9 Pairs of Standard US cable Dies (8AWG-4/0AWG) - Professional Grade Battery Cable Crimper for Secure Connections, Electrical Projects, and More).

 

[740GLE]

https://a.co/d/9eVFjcH

This one does work for 4/0 you just gotta get some mustard on that swing.

If you are curious about a crimp you have in service you can always cut one in half and verify the cold weld, should be one solid mass when cut in half.