It started with the dual battery kit switch install... - Page 4 - Toyota FJ Cruiser Forum
Stereo / Electronics / Electrical If you have a topic that deals with the electronic components, stereo, etc. then post it in here.

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post #31 of 34 (permalink) Old 05-28-2012, 08:03 PM Thread Starter
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Re: It started with the dual battery kit switch install...

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G'day dougla2,
Thanks for the message. Yes Murphy's law equally applies down under.. lol
Good advice too, how big should it be ? I am guessing huge..ish, would a circuit breaker work as well ? hmmm, I have a couple of 80 amp inline fuses spare and an 80 amp circuit breaker spare, but I think I should use some thing bigger... 200 amps or something ?
Thanks for the guidance.... much appreciated.
Cheers
Baz
To calculate the main fuse value, I just add up the loads and tack on another 10% or so, and consider the gauge and length of the directly connected wires. Be sure not to exceed the wire capacity since the point of having the fuse is to prevent the wire from melting down and starting a fire or, like mentioned earlier, destroying the battery itself. I'm sure someone will find fault with my off the cuff calculations, and I am open to learning a better way. I added up the fuse values of my accessories and came up with around 100A, and since my wire to the rear is an 8ga, chose a 100A fuse. This exceeds the rating for 8ga wire a bit, but I think the fuse would open before the wire could burn thru its insulation and certainly before the battery fails. And when everything is on, the total load is below 100A. Now, when I add the winch, it will be directly connected to the aux battery and have its own fuse. I do carry extra fuses of each type, which is a step up from the old days when I wrapped a blown motorcycle fuse in the foil from a pack of smokes to get home.

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post #32 of 34 (permalink) Old 05-28-2012, 08:40 PM
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Re: It started with the dual battery kit switch install...

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dougla2 previously said: View Post
To calculate the main fuse value, I just add up the loads and tack on another 10% or so, and consider the gauge and length of the directly connected wires. Be sure not to exceed the wire capacity since the point of having the fuse is to prevent the wire from melting down and starting a fire or, like mentioned earlier, destroying the battery itself. I'm sure someone will find fault with my off the cuff calculations, and I am open to learning a better way. I added up the fuse values of my accessories and came up with around 100A, and since my wire to the rear is an 8ga, chose a 100A fuse. This exceeds the rating for 8ga wire a bit, but I think the fuse would open before the wire could burn thru its insulation and certainly before the battery fails. And when everything is on, the total load is below 100A. Now, when I add the winch, it will be directly connected to the aux battery and have its own fuse. I do carry extra fuses of each type, which is a step up from the old days when I wrapped a blown motorcycle fuse in the foil from a pack of smokes to get home.
G'day Dougla2,
OK, thanks, so the primary cable from battery to battery thru the ACR has a continuos rating of like 500 amps, peak 2500 amps... so I need a 500 amp fuse ? on B&S 2 gauge battery wire. WOW....
Then off the Aux battery I am running house electrics, again thru B&S 2 gauge wire to another 500 amp solenoid,less than 20 inches from the battery - then splitting out on 6 gauge wire to 4 separate 80 amp fused distribution boxes, and the ARB compressor @ 50 amp max load, total potential load if all are switched on about 370 amps. Each load is separately controlled via 80 amp circuit breakers then thru 100 amp relays from inside the cabin. Being able to switch each on or off as I choose.
So the house electronics are governed. I just need a whopper of a fuse for the primary cable..... and the cable to the 2nd solenoid another 400 amp fuse .... lol.
Does that make sense ?

I know my system is over kill, lol.... but i like to be safe.....
Thanks n cheers
Baz
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post #33 of 34 (permalink) Old 05-29-2012, 05:20 PM Thread Starter
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Re: It started with the dual battery kit switch install...

Way to go Baz!

Now that is one over the top electrical system. Instead of adding any sort of a fuse, I would suggest a great big fire extinguisher and maybe one of these.

[IMG][/IMG]

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post #34 of 34 (permalink) Old 09-03-2019, 05:35 PM Thread Starter
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Re: It started with the dual battery kit switch install...

It finally happened, the original stock Panasonic battery died. It only lasted 10 years and 11 months. It happened at the worst time, I was just leaving a medical treatment and was pretty wobbly. Fortunately, I have a spare battery on board, so put the "Soviet era switch" into the emergency position, hit the key and it started right up. Thank you to Dirty Parts for the kit, it worked perfectly. After the engine started I put the switch back in the left Dual On position and drove home to seek out a replacement battery. Probably go with a Diehard AGM, the local Sears has a Gold model. Happy. BTW, I still love the truck.
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