BOLT-ON FUSE - correct application

[queenpictoria]

Hello,
In hooking my 12v 100a Lithium Ion Phosphate battery to my solar setup,
I have a question regarding the "Bolt-on fuse' that will be attached to my
positive battery cable, and attached AT THE BATTERY TERMINAL.

The bolt I am using is smaller than the hole on the fuse.
I will be purchasing a couple more battery bolts, but for now, I am
using a smaller bolt to attach the 175A Bolt-On Fuse to the end
of the positive cable, before attaching the positive cable to the
battery.

Question: Is there a problem using washers on the 175A Bolt-On Fuse
in order to cover the difference in surface area between the size of the bolt
and the ring connector on the end of the positive battery cable?

This is only a question regarding the attaching of the Bolt-On Fuse to the
end of the positive battery cable.

I do have the proper size of bolt/nuts to attach the battery cables to the
battery.

Thank you for your attention on this matter.

 

[John Frum]

Please post a picture.

 

[MrM1]

I think he's talking about a class T Fuse perhaps without the Fuse holder?

 

[queenpictoria]

Please post a picture.

Hi Joey, that is not an answer to my question. I am looking for a common sense answer.
Thank you.

 

[queenpictoria]

I think he's talking about a class T Fuse and Fuse holder

That is not an answer to my question. Thank you.

 

[queenpictoria]

Please post a picture.

That is not an answer to my question. Thank you.

 

[Will Prowse]

We want to see what you mean about the difference in size. Can you post a picture of the difference?

I think you mean automotive bolt-on fuse. I would get a fuse holder if a bolt on fuse does not work for your application. You cannot use washers.

 

[queenpictoria]

We want to see what you mean about the difference in size. Can you post a picture of the difference?

I think you mean automotive bolt-on fuse. I would get a fuse holder if a bolt on fuse does not work for your application. You cannot use washers.

Thank you, yes! I will send some photos.

 

[queenpictoria]

Here are some photos. Thank you for your feedback.
Please let me know if you need anything else.

 

[queenpictoria]

Thank you, yes! I will send some photos.

Hello, I remembering now being told not to use washers.
I will have to find a larger bolt and nut. Thanks for reminding me.
Best to you!

 

[queenpictoria]

Battle Born sent me an extra set of nuts and bolts for the batteries.
I took away the washers and will tape up all the positive connections.
Thanks so much for your work.

 

[time2roll]

I would use a fuse holder for AMG.

I thought you meant a fuse that goes on the terminal.

 

[Struc]

I thought you meant a fuse that goes on the terminal.

That is a MRBF fuse, and yes, I think that would be a lot better application for what is being requested.

 

[Browneye]

You need one of these...
If you don't have a terminal crimper you can source a connecting cable already made up.

 

[Steve_S]

You need one of these...
If you don't have a terminal crimper you can source one already made up.

Fuses themselves cannot take any strain at all, they can & do break easily ! Such fuses should always be in such a holder. I use MRBF Fuses like @time2roll posted which are roughly $30 USD.

Links for your interest:
BlueSea uses BussMan/Eaton and other Top Quality products.
Safety & protection devices are not the items to be frugal with. (it can really make for a bad day, quickly)

MRBF Terminal Fuse Block - 30 to 300A - Blue Sea Systems

Easily and economically satisfies ABYC 7 circuit protection rule by mounting on a 3/8 battery post, battery switch or bus bar.

www.bluesea.com

https://www.bluesea.com/products/5001/MEGA___AMG_Fuse_Block_-_100-300A_with_Cover

 

[Levo]

Hello, I remembering now being told not to use washers.
I will have to find a larger bolt and nut. Thanks for reminding me.
Best to you!

Trying to understand reasoning behind "no washers". The washers form no part of the circuit, just there to increase the firm clamping area of the conductors. Isn't that a good thing? Don't fuse holders often come with washers anyway?

 

[John Frum]

Trying to understand reasoning behind "no washers". The washers form no part of the circuit, just there to increase the firm clamping area of the conductors. Isn't that a good thing? Don't fuse holders often come with washers anyway?

"no washers" in this context means, don't put a washer between conductors.

 

[Levo]

Thank you for clarification. I use washers all the time, just to improve clamping.

 

[Browneye]

One more thing to create resistance. Especially zinc plated ones. Introducing dissimilar metals is another consideration, for galvanic corrosion.

SS Nyloc nuts are a good option.
And some metals just don't play well together, like copper on aluminum. Aluminum gets a resistive corrosion coating almost instantly when exposed to open air.

Here's a conductivity chart comparison on metals:

 

[WYtreasure]

A bit more on connecting to batteries is here as well as in my signature.

I know I am not answering the question, thank you.