Fusing between four batteries in parallel without a bus bar

[Wlutz84]

Wondering what size in line fuses I should put inbetween each of 4 12v 100ah batteries connected in parallel without using a bus bar. Max current draw from inverter of 150 amps using 2/0awg. For the sake of learning, what size if I wanted to pull 80 amps from each battery?

 

[rodrick]

1 what type of batterys are they fla agm Lifepo4 ect
2 150 amp on inverter is peak or normal max ie 1500 continuous 3000 peak is a common rated inverter
3 are wires on battery going to a buss bar
4 any further expansion planed

 

[Wlutz84]

1 what type of batterys are they fla agm Lifepo4 ect
2 150 amp on inverter is peak or normal max ie 1500 continuous 3000 peak is a common rated inverter
3 are wires on battery going to a buss bar
4 any further expansion planed

Lifepo4, it's a 2000w inverter/4000 peak, but I won't use all the watts. No buss bar being used on batteries. No further expansion beyond this

 

[rodrick]

Most likely you have 100amp bms so 125 or 150 amp fuse will protect them if something goes wrong
You have the potential to pull over 300amps with that inverter so bringing the batteries to a buss would be wise then a 350 to 400 amp feeding that large inverter a short to ground or locked rotor or some other problem could max it fast
the buss will help in many ways with power discharge and charging keeping batteries balanced and working to supply power equally from the 4 battery source

 

[rodrick]

Also wire from batteries to buss only needs to be #2 and from buss to inverter should be 4/0 min

 

[Wlutz84]

Would like to know about effectively fusing each battery without a bus bar, possible?

 

[rodrick]

Will prowse has a good utube video on this chaining four batteries together like you wish to do showing what happens to the battery on the end of the line I suggest you watch his video

 

[rodrick]

https://www.amazon.com/gp/product/B08PY4DHTQ/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&th=1
this is a inexpensive buss with good quality this will make a clean job of you wiring but as a option
you could make 4 equal cables with fuses and put lugs on them to a main cable to inverter 4 into one bolting all together this will help to keep all batteries balanced
how do you plan on charging them

 

[koobs]

If running banks in parallel, I would advise fusing between each bank, appropriate to your wiring and load usage. For example I run 3x 280ah 48v Banks, wired in parallel. Each bank has its own individual 120A MCCB, rated for 10KA breaking capacity. Wiring between banks is 35mm2.