MRBF - Can you use on the battery terminal w/out fuses?

[mmlco]

I am wondering if the Blue Sea dual MRBF can be used as just a battery post extender/adapter without fuses? This is for an RV with 2 6v in series batteries. I have already planned to use a class T fuse for my inverter load.

Thanks so much for input.

 

[chrisski]

Honestly, nothing is stopping you on your RV build about what to do.

In my RV build, I opted for Class T or ABYCC main battery protect rated fuses and used proper fuse horders. Those take up a bit more space than one would think and I was tempted to not put in a holder, but opted against it. There’s got to be a reason those fuse holders have an official rating.

My first build was four 6 volt FLA batteries in a 2s2p config for 12 volts and updated to 4S for 24 volts, and I did not use fuses for individual batteries. I did fuse with an ANL fuse in an ANL fuse holder.

My upgrade was to lithium. I have 2 batteries of 8S 280 ah cells, and each of those batteries is individually fused with a class T fuse and holder and then again once combined with a class t fuse and holder. The fusing and busbars took up as much space as a battery. I was tempted to do things like you were saying, but opted against it.

 

[mmlco]

Thank you chrisski. I'm just looking to tidy up the terminals because I'm keeping the generator wire out of the inverter circuit (which will have the Class T close to the batteries). I do have the MRBF fuses for both. I think it is redundant when my goal is a tidy positive battery post.

 

[mikefitz]

Without the fuse in place there is no continuity , the fuse studs are isolated.