Featured Recommendations for 150A fuse between alternator and batteries?

[Voo Doo]

Hello all,
I recognize I am out of my league with my car project -- but I think the Car Audiophiles probably have the experience with a similar situation… and have advice....
I want to connect two identical 12V AGM batteries in series, and use a single 160A fused switch between the batteries and the alternator. The alternator is a 160A 1-wire unit, and I will be using 1/0 battery cable the whole way.

Attached is a pic of the 150A fused switch I have in hand (from Amazon -- see attached pic) that I was thinking to place back by the battery. I like the idea that I can use this as an anti-theft device, HOWEVER, somehow I just do not feel that the fuse is adequate -- small in/out terminals, and kinda chintsy feel to the switch and reset button.
Will this fuse work, or is this a known major problem area? This is the item on Amazon (https://www.amazon.com/dp/B0CC9DYBDH/?tag=caraudiocom-20 )

Are there any comments about this switch, OR any recommendations for a switch that can go from one input (from the alternator) and split into 2 outputs (to each of the 2 batteries) -- or any other recs?

Thank you.

Click to read more...

 

[dragon.breath 10+ year member]

Just run the wire from the alternator to the first battery, then run a wire from battery 1 to battery 2. Trying to split the wire middle for each battery just adds another connection point and a point for failure.

 

[1aespinoza Premium Member]

Are there any comments about this switch, OR any recommendations for a switch that can go from one input (from the alternator) and split into 2 outputs (to each of the 2 batteries) -- or any other recs?

I used one of those for the longest time on a 1200w system with zero issues.
FYI, never run the batteries in series. That will bump you up to 24v.

 

[Baloo]

FYI, never run the batteries in series. That will bump you up to 24v.

Yikes, I want to keep it 12v, just want to increase Amps.
I thought series did this.
Again, I'm dangerous for what I don't know.
Will research this again!

 

[1aespinoza Premium Member]

Yikes, I want to keep it 12v, just want to increase Amps.
I thought series did this.
Again, I'm dangerous for what I don't know.
Will research this again!

Parallel is what you want to do. It is positives together, negatives together.

 

[Old_Slapper]

I was about to ask the same thing. Why would you want to wire the batteries in series. But then you said you were connecting them to the same alternator, so I figured you got series and parallel mixed up.

What's the amp draw from the batteries going to be, and what gauge wire are you using?