Need help with fuses and safety of system

[bbanjoboy]

So after posting my first thread here I found I had a lot to learn. After tweaking my power needs, I believe I have an idea of what may work now. Here's my issue now: I have six brand new LPF12110 12v 110Ah rechargeable sealed lead acid batteries. I need to get fuses for each positive terminal and plan to connect them in parallel. I want them to go to bus bars then to a T class fuse then to my inverter. Am I missing any safety fuses? My biggest question is what size fuses do I need for the positive terminals and what size T fuse and what size bus bars should I get? Any links would be greatly appreciated. Thank you all so much for sharing your wisdom!

 

[Rocketman]

What kind of loads will you be connecting to the battery bank? What size of inverter?

Is this in an RV? If not - consider going 24v.

For bus bars - you need thick tin- plated copper bars - do NOT get brass ones.

Blue sea makes a good one. My favorite is a Victron PowerIn (you can add fuses lookup how on YouTube). The Power In has both the positive and negative in one device. It only handles 4 - but you can add on.

Fuses protect the wires - not the devices. So to know what size of fuses - we need to know what size of wires.

My assumptions:
#2 wire between batteries and bus bars - use 100a fuse.
After bus bar - use 4/0 wire & 400a fuse.

After your battery buss bar - you should have on the positive wire the fuse and a switch to turn the system off. On the negative cable you should have a shunt based battery monitor - like a Victron Smartshunt or BMV712. That way you can know how full/empty the batteries are.

Then you should go to a distribution bus bar - inverter, Solar charge controller(s), other loads, etc go on this bus bar - anytime you go to a smaller wire - say #6 to the solar charge controller- it needs fused.50a for #6 or a #14 for a light - #14 needs 15a fuse.

If you get a short in any wire - the fuse for that wire will pop at the wires rated capacity.

Did my novel make sense? Or did I screw up the way I typed something…

Good Luck

 

[bbanjoboy]

What kind of loads will you be connecting to the battery bank? What size of inverter?

Is this in an RV? If not - consider going 24v.

For bus bars - you need thick tin- plated copper bars - do NOT get brass ones.

Blue sea makes a good one. My favorite is a Victron PowerIn (you can add fuses lookup how on YouTube). The Power In has both the positive and negative in one device. It only handles 4 - but you can add on.

Fuses protect the wires - not the devices. So to know what size of fuses - we need to know what size of wires.

My assumptions:
#2 wire between batteries and bus bars - use 100a fuse.
After bus bar - use 4/0 wire & 400a fuse.

After your battery buss bar - you should have on the positive wire the fuse and a switch to turn the system off. On the negative cable you should have a shunt based battery monitor - like a Victron Smartshunt or BMV712. That way you can know how full/empty the batteries are.

Then you should go to a distribution bus bar - inverter, Solar charge controller(s), other loads, etc go on this bus bar - anytime you go to a smaller wire - say #6 to the solar charge controller- it needs fused.50a for #6 or a #14 for a light - #14 needs 15a fuse.

If you get a short in any wire - the fuse for that wire will pop at the wires rated capacity.

Did my novel make sense? Or did I screw up the way I typed something…

Good Luck

What kind of loads will you be connecting to the battery bank? What size of inverter?

Is this in an RV? If not - consider going 24v.

For bus bars - you need thick tin- plated copper bars - do NOT get brass ones.

Blue sea makes a good one. My favorite is a Victron PowerIn (you can add fuses lookup how on YouTube). The Power In has both the positive and negative in one device. It only handles 4 - but you can add on.

Fuses protect the wires - not the devices. So to know what size of fuses - we need to know what size of wires.

My assumptions:
#2 wire between batteries and bus bars - use 100a fuse.
After bus bar - use 4/0 wire & 400a fuse.

After your battery buss bar - you should have on the positive wire the fuse and a switch to turn the system off. On the negative cable you should have a shunt based battery monitor - like a Victron Smartshunt or BMV712. That way you can know how full/empty the batteries are.

Then you should go to a distribution bus bar - inverter, Solar charge controller(s), other loads, etc go on this bus bar - anytime you go to a smaller wire - say #6 to the solar charge controller- it needs fused.50a for #6 or a #14 for a light - #14 needs 15a fuse.

If you get a short in any wire - the fuse for that wire will pop at the wires rated capacity.

Did my novel make sense? Or did I screw up the way I typed something…

Good Luck

Thanks SO much for the reply.. I'm sorry I haven't gotten back sooner, but this project is on the back burner.. I have been ordering a few things and I have run into a small stumbling block.. The fuses I ordered to put at the positive battery terminals were these: https://www.amazon.com/BOJACK-Curre...8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1

I have found that the holes are a bit too small but I can purchase smaller bolts, no problem.. My question is though, that when looking for alternative fuses I found some similar were rated 100 Amp but 32 volt or even higher.. WIll this be an issue for me since I will be running a 12 volt system? Thank you so much!

 

[Rocketman]

No problems putting a 32v fuse on a 12v battery.