Battery Balancer question

DIY
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1

Hello,

As some of you may have seen, i’m starting wiring our victron campervan build. Been a challenge to source all the pieces and damn expensive. I just dont want to screw things up :slight_smile:

On the battery balancer, i read that i need to use 3 wires… wit ha 5-10A fuse (or w/e smaller).

1 for positive
1 for negative
1 for “positive or negative doesnt matter” (mid point).

That being said, the stud i have on my batteries are a “screw type of thing”.

We bough two 12V 230AH and the screw secure the lug.

My question: Is it safe to have the following setup:

battery post > Lug > O Ring with 12 Gauge wire (~ 2feet wire) > (lock washer) > and nut.

I mean i though having a “smaller gauge” on top of the Lug would require more like a washer/lockwasher/nut to prevent heat?

should we find a washer / lockwasher / nut that could thread in to ensure things doesnt heat etc due to vibration ex:

battery post > Lug > washer >lockwasher >nut > O Ring with 12 Gauge wire (~ 2feet wire) > washer > (lock washer) > and nut.

Or is that not safe?

2

I would go with

battery post > Lug > O Ring with 12 Gauge wire > washer > lock washer > nut

The O rimg crimp connectors you often get for 12g wire are relatively thin copper and not suitable for tightening a lock washer against so you want a washer in the mix.

You could double nut it if really worried about vibration.

Your final solution puts extra resistance between the balancer and the battery, may not be an issue at these lower currents but it is not good if the upper connection is high current.

3

Ok thanks, i guess i’m just being over affraid of what i seen on various forums where small wire get “heated up” but in most case its becasue people place it underneath! which is not to be done.