50 AMP BREAKER TRIPPING

[Bill Staley]

We have an issue where our 50 amp breaker is randomly tripping when all 3 A/C units are running.  I have shut off all of the other things that I can think of that might be adding to the amp total.  The refer and the TV are still on.

What is the chance that the breaker has gotten weak?

[David T. Richelderfer]

While on shore power or generator?
Generator size?
Breaker on one of two 50a legs trips?
       Always the breaker on the leg with two a/c's that trips?
Is it possible one a/c has gone bad?  (I had one of three a/c's go bad and on startup it would pull 75a+ due to a bad bearing.)
Where are your 50a breakers located?  (I don't have 50a breakers, do I?  Maybe in the generator?  I must look. lol)

[Bill Staley]

They trip while on shore power. 
I just had them ( all three) checked so there shouldn't be a startup problem.
Dual breakers.
And, each A/C has their own breaker.
Only the 50A trips.
The breakers are located in the AC panel in the bathroom.
I really don't think it is the A/C units that are causing the problem.  Am wondering if others need to shut down one of the A/C units whit they run other appliances.

[Bill Sprague]

You have a pair of 50 amp breakers, for 100 total.  It is a two leg system.  The right column of breakers is one leg and the left column the other.  Because you have three A/C units, two will be on one side and one will be on the other. 

Each A/C will draw about 13 AMPs with peaks to about 20 as the compressor cycles.  What else is on the leg that has two A/Cs on it?

Can you tell which of the two 50 amp breakers is tripping?  Can you monitor loads on your Aladin screen?