Bow thruster Battery

[philip_stevens]

I already have the Quick hydraulic breaker at the start of the run from the 3x105Ah battery bank end, and will fit another fuse in the line from the thruster battery to the thruster.

I must remember to leave the Quick breaker on at all times when on the boat, but this will still leave 12v feed from the thruster battery to the windlass. Therefore, I will have to fit another breaker between the thruster battery and the windlass.
I will have to sort out this arrangement to ensure the windlass is separately fused.
Thinking cap on.
It will work, but needs refinement.

 

[pvb]

I already have the Quick hydraulic breaker at the start of the run from the 3x105Ah battery bank end, and will fit another fuse in the line from the thruster battery to the thruster.

I must remember to leave the Quick breaker on at all times when on the boat, but this will still leave 12v feed from the thruster battery to the windlass. Therefore, I will have to fit another breaker between the thruster battery and the windlass.
I will have to sort out this arrangement to ensure the windlass is separately fused.
Thinking cap on.
It will work, but needs refinement.

I'm still unclear about whether you understand the risk. Basically, you need a fuse (or breaker) connected directly to the positive terminal of the thruster battery, with other cables connected the other side of the fuse/breaker. The cable run you need to protect is the long run back to your domestic bank.

 

[Boathook]

I already have the Quick hydraulic breaker at the start of the run from the 3x105Ah battery bank end, and will fit another fuse in the line from the thruster battery to the thruster.

I must remember to leave the Quick breaker on at all times when on the boat, but this will still leave 12v feed from the thruster battery to the windlass. Therefore, I will have to fit another breaker between the thruster battery and the windlass.
I will have to sort out this arrangement to ensure the windlass is separately fused.
Thinking cap on.
It will work, but needs refinement.

Any cable from a battery to an 'appliance' should be fused. This would also include any cable linking up to another battery. The fuse should fail before the cable, therefore a cable rated at 30 amps would have a 30 amp or ideally smaller fuse.

 

[philip_stevens]

I'm still unclear about whether you understand the risk. Basically, you need a fuse (or breaker) connected directly to the positive terminal of the thruster battery, with other cables connected the other side of the fuse/breaker. The cable run you need to protect is the long run back to your domestic bank.

Hi PVB, thanks for the explanations, and yes, I do understand, having been a MN electrician for 25years.

I just have to work out where to put fuses and thermal breakers to protect cables between batteries, and cables/batteries to the windlass and thruster.

In fact, I know where to put them - it is just connecting it all. Getting around to doing it.

I was just trying to explain another way of running the thruster with what is already in the boat, and what I am going to add.