DC Electrical question

[doc g]

Should the current on either side of a breaker be the same ? I've got a two big DC breakers that control the current to my two inverters. On the batt'y side (before the breaker) I have E meters they are showing different current into and from the batt's , I checked with the amp probe and it reads what the Emeters do. If I measure the current after the breaker my amp probe shows the current out/in (after the breaker ) to be the same ,that is equal side to side in all modes . Its seems that I have more current on one leg and less on the other measured before the breaker but they add up to be the same as the measurement after the breaker which again is equal. So ,measured before the breaker say 120 A/ 80A,measured after 100A/100A. Sorry to be too confusing . Any insight greatly appreciated!!..........Pat

 

[REBrueckner]

The current in and out of a breaker must be identical unless the breaker is on fire and burning up power.

You post:

"...On the batt'y side (before the breaker) I have E meters they are showing different current into and from the batt's ...."

I can't understand the above description...do you actually have breakers between the battery and inverter??....usually the battery is connected directly to the inverter via a special "T" fuse....
Other parts of your description are also unclear..."equal side to side all modes" ...more current on one "leg" ....

Maybe its me, but I suspect you'll have to describe the above more clearly to get helpful replies....

 

[doc g]

The inverters are connected as follows , Batt's/Tfuse/cable/breaker/cable/inverter on the positive . Thus the before and after breaker readings,read from the cable itself...... Hope this helps........Pat

 

[doc g]

Well after alot of work and phone calls to inverter reps and dealers , all who told me that what I was seeing was impossible. I finally figured out what was going on with my inverter system. I had a partially blown T-fuse in one of the banks . I amp'd put all the cables at the batt's and found that one bank was significantly different than the others . I then checked for a voltage drop across the terminals and found that at the bad fuse I had 12.85 on one side of the fuse and 12.60 on the other. I removed it from the circuit and all was balanced between the two banks again. If anyone has any insight on what was going I'd appreciate the input. The system is two 4kw inverters in series that have 4 ,8D's each . Each bank is electrically seperate from the other. Emeters are installed in the endrun of the negative cables............Pat