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evanlaczi

Dual battery hookup

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evanlaczi

So today was the first time I had a dead battery and was not fun jumping the boat at marina. I have a 98 response with one battery under dash. My question is what do I have to do to setup a dual battery. Which battery to get what other things switch cables etc. thanks.

Evan.

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DOOFUSisaCAT

buy a new boat with the twin battery set up! ha ha

Most any parts (NAPA, or bakes on line site) with have the wiring harness and switch needed. Then add a battery.

Do a search as the same topic has been discussed and beaten to death....but there are schematics showing how to hook both batteries up to your newly purchased switch.

Good luck!

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MLA

The battery type and size will be driven by how you intend to use the 2nd bank. The wiring and schematic will depend on whether you go with a traditional 1/2/BOTH/OFF switch or an ASR/VSR switch setup. In general, you will need ample size cable to reach from the battery to the switch and from battery to battery. To make it simple, look to locate the switch where the existing main battery cable will reach, as it will come off the original battery and now go to the switch. Other wise, you are replacing the the main cable with a longer.

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MadMan

So today was the first time I had a dead battery and was not fun jumping the boat at marina. I have a 98 response with one battery under dash. My question is what do I have to do to setup a dual battery. Which battery to get what other things switch cables etc. thanks.

Evan.

Dead battery at the marina => not so bad

Dead battery middle of the lake => very bad

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Nitrousbird

Get an ACR setup, such as the Blue Sea Add-A-Battery kit. It makes a lot more sense than the traditional switch-only setup and isn't that expensive.

Or go the cheap/easy route and simply put a new battery in and keep a Lithium-Ion jump pack with you. $60 bucks, small, easy to use and you won't be stranded anywhere.

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BFresh

Here's an old thread with a couple dual battery schematics, including what I did on my '98. Very happy with it this season. I enjoy playing music for hours at our hang out with the boat off and having a dedicated battery just for starting the boat.

http://www.themalibucrew.com/forums/index.php?/topic/52831-blue-seas-add-a-battery-help/

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Chatty21VLX

I have dual batteries with the 1/2/both/off switch. How much time listening to the stereo with the engine off should warrant switching to the stereo only battery?

Say the stereo is on battery 2. When you park, do you switch to battery 2 with engine off ----> when you're ready to start the engine, switch to battery 1 -----> switch to both while engine is running?

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MLA

I have dual batteries with the 1/2/both/off switch. How much time listening to the stereo with the engine off should warrant switching to the stereo only battery?

Say the stereo is on battery 2. When you park, do you switch to battery 2 with engine off ----> when you're ready to start the engine, switch to battery 1 -----> switch to both while engine is running?

Lets presume your setup is wired in the most ideal manor, all loads, as in the "stereo", would be wired to the common post of the switch. If just changing riders or filling ballast, i see no need to switch. if dropping anchor, you want to make sure the switch is on 1 or 2, not BOTH. This keeps one bank in reserve for cranking. If your boat has a dedicated house bank, then you would want to switch to that house bank upon dropping anchor.

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redsled04

I have dual batteries with the 1/2/both/off switch. How much time listening to the stereo with the engine off should warrant switching to the stereo only battery?

Say the stereo is on battery 2. When you park, do you switch to battery 2 with engine off ----> when you're ready to start the engine, switch to battery 1 -----> switch to both while engine is running?

This is how I ran my 99 response for years. I ran two optima's in the factory location. With a perco switch right below them. All the audio was ran on bank #2 and the rest of the boat was on #1. I ran the stereo battery dead a few times but always had the other one ready when it was time to head home. I would switch to both on the way back to the launch. That would keep them charge most of the time. If I was out all day or #2 went dead I would just put it on a charger.

I have an acr on my new to me Malibu and I still don't quite understand how it works. The perco switch seems like a easier setup. But I haven't had a chance to research how the acr works.

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MLA
I have an acr on my new to me Malibu and I still don't quite understand how it works. The perco switch seems like a easier setup. But I haven't had a chance to research how the acr works.

Launching boat = switch in the ON position

Putting boat away = switch in the OFF position

Need emergency start = switch to COMBINE

Far simpler then a traditional switch as its somewhat automatic. ACR allows both banks to receive a charge when engine running, yet isolated from each others loads when engine is off.

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Nitrousbird

I have dual batteries with the 1/2/both/off switch. How much time listening to the stereo with the engine off should warrant switching to the stereo only battery?

Say the stereo is on battery 2. When you park, do you switch to battery 2 with engine off ----> when you're ready to start the engine, switch to battery 1 -----> switch to both while engine is running?

With an ACR, none of that crap. Just leave the switch to On and the ACR does all the rest.

Only thing I do with mine is when I park her in the garage and plug the onboard charger in, I unhook the ground wire from the ACR, so the charger doesn't combine the banks (dual battery charger). I could even get past unhooking the ground wire with a little extra wiring and a relay but its so easy I never bothered (literally a push connector).

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shawndoggy

With an ACR, none of that crap. Just leave the switch to On and the ACR does all the rest.

Only thing I do with mine is when I park her in the garage and plug the onboard charger in, I unhook the ground wire from the ACR, so the charger doesn't combine the banks (dual battery charger). I could even get past unhooking the ground wire with a little extra wiring and a relay but its so easy I never bothered (literally a push connector).

Or you could just turn the switch to off.

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Nitrousbird

Or you could just turn the switch to off.

I lose my clock and head unit settings if I do that, as I wired everything to the switch. Since the boat is garaged and always on the charger, I didn't see a good reason to wire the memory wires directly to the battery.

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shawndoggy

I lose my clock and head unit settings if I do that, as I wired everything to the switch. Since the boat is garaged and always on the charger, I didn't see a good reason to wire the memory wires directly to the battery.

If you never turn the switch off you've effectively wired the HU to the battery anyhow. Just wire the HU to a battery post on the switch. That's how the bilge should be wired too.

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Bturner

Take the easy path. Do the Blue Seas add a battery kit, install it and be done with it. I also like the idea of being able to turn all the electrical when I store the boat.

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BFresh

Yes, I 100% agree with shawndoggy and that's how I have mine setup. Use an ACR to simplify your need to remember to be in 1/2/ or off and you just have to turn it on when you want to use the boat and off when not in use or charging via a charger so that they do not combine while charging. Take the time to run the head unit wire (yellow?) right to the battery, and make sure your bilge pump is as well. Now you'll never lose clock memory and can simply turn the ACR to 'off' when you get home.

The ACR simply combines the batteries when a charging source is detected (alternator or charger, it doesn't know). The batteries are separated when the engine is off, so the stereo can drain battery #2 without touching battery #1 for example. When the engine is running, they are combined and the alternator will charge up both batteries. The reason I turn the ACR off when at home is because the charger I have is a dual bank 'smart charger' so you want it to properly do it's magic on charging each battery independently.

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redsled04

Launching boat = switch in the ON position

Putting boat away = switch in the OFF position

Need emergency start = switch to COMBINE

Far simpler then a traditional switch as its somewhat automatic. ACR allows both banks to receive a charge when engine running, yet isolated from each others loads when engine is off.

Simple enough. I assumed it switched to the second bank after the first ran low. Which wouldn't be good if playing the tunes all day.

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formulaben

If you decide to install the Blue Sea Systems kit, check this thread and perhaps search other posts for the "correct" way to configure it in your boat.

Edited for clarity.

Edited by formulaben

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MLA

Just note that the switch in that linked thread, is vastly different then the switch the OP currently has, making the diagram irrelevant. The OP would need to get the proper switch along with the ACR, or do a one-off unconventional wire diagram.

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