Terminal Battery Fuse Question

[aaronorange]

How should I fuse 3 lithionics 130ah batteries wired in parallel when connected to a 3000W Xantrex inverter? I was having issues with the 300a Optifuse. I was told to replace the Optifuse breaker with a Blue Seas disconnect switch. I’m apprehensive not having a fuse inline. Would a 300amp Blue Seas MRBF terminal fuse be sufficient? I currently use a 400amp under the street side bed. I also plan to add the Blue Seas disconnect ether under the SS bed or in the battery compartment. Thanks! 

Edited 18 hours ago by aaronorange

[mossemi]

@aaronorange  I am not sure what this 300A Optifuse is protecting, so without more information it may be difficult to get an answer.  Can you include some pictures?

Mossey

[aaronorange]

Mossemi- Sorry let me try to clarify, The Optofuse was between the 3 lithionics 130ah batteries and the 3000W Xantrex inverter/charger. (OEM from Oliver) My real question is does anyone use MRBF fuses, if yes what amp fuse are they using? Are they using one fuse or one on each positive terminal? Just wanted to see how others are handling the issue with the Optifuse breaker. I understand others are also having problems. 

Edited 12 hours ago by aaronorange

[jd1923]

Far better protection than a breaker, get two of these (to have a backup fuse):

https://a.co/d/bdK8VQb

and a fuse holder like this:

https://a.co/d/9V3H8RB
 

[aaronorange]

JD1923, I got ahold of Lithionics and they say MRBF Fuses are ok. They say I can do a single 300a fuse. This fuse attaches to the battery terminal. So protects right from the source.
I also found out Xantrex recommends a 350a fuse max.
 

So the inline 400a I put in for testing will be down graded to 350a if not removed.

 

Thanks everyone for the help as I researched this issue. 
 

 

 

[Ronbrink]

I used both the MRBF and ANL (250A each) with my LFP upgrade, as well as a Victron SmartShunt. I didn’t add a monitor for the SmartShunt, just use the Victron Connect app. I considered adding a battery cut-off switch, but just use the stock 200A blade breaker between the batts and inverter in like manner. I have the Xantrex 2000W in my 2020 OLEll. 

 

Edited 1 hour ago by Ronbrink