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Adding a House Battery How To??

Old 12-03-2017, 07:15 AM
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Default Adding a House Battery How To??

Current set up is on a 22 ft bay boat with a 2007 225 hp Etec. I currently have 3 batteries, two deep cycle batteries for a trolling motor and a starting battery for everything else.

Everything else includes a Lowrance HDS 10, vhf, baitwell pump, power pole and jack plate that are always used when I’m on the boat. In addition, I occasionally use my live well pump and navigation lights. All of this ran off of the starting batter.

I have the typical off-1-2-both battery switch that is wired to allow for one of the trolling motor batteries to be combined with the starting battery if needed. I also have a three bank on-board battery charger with one lead hooked to each battery to keep the batteries charged.

So far, I have not had any problems with this set up. However, I have decided to add a stereo, speakers, and amp to the boat. I don’t think my current battery set up will be sufficient so I want to add an additional house battery for all the electronics and isolate the starting battery for only starting the engine.

I have considered replacing the starting battery with another deep cycle battery that is connected to the power distribution system, then connect the stereo and amp to that. My existing three bank battery charger would be used to charge the three deep cycle batteries. I would then connect the motor’s power leads to the starting battery. I would think that the Etec could keep the starting battery charged but I could also add a single bank battery charger if needed. This would completely isolate the starting battery from everything else.

The other option I have considered is to use the Blue Sea Add a Battery kit. I would add the ACR between the existing starting battery and a new deep cycle battery. My concern with this system is that I am not sure if it would completely isolate the starting battery.

Any other suggestions on either option or any suggestions on how best to add a new house battery?

Thanks!
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Old 12-03-2017, 07:41 AM
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Regarding charging of a HOUSE battery by the E-TEC engine, you should consider buying the AUXILIARY CHARGING KIT accessory from Evinrude. This allows the E-TEC to have two charging outputs. You connect the new, second charging output to the HOUSE battery.

I describe this in much more detail in an illustrated article on this topic available at

Auxiliary Battery Charging Kit for E-TEC
http://continuouswave.com/ubb/Forum6/HTML/002758.html
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Last edited by jhebert; 12-03-2017 at 07:47 AM.
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Old 12-03-2017, 12:53 PM
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Blue seas also has a charger/ACR unit that you plug in. You could add the house battery and use that instead of only the ACR and allow charging of both at home.

All.of your house loads go to the new battery and the starter is isolated from supplying power unless you combine.
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Old 12-03-2017, 02:24 PM
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the Yandina Combiner will be your best option in terms of cost and ease of installation. It'll do everything you want it to do.

http://www.yandina.com/c100InfoR3.htm
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Old 12-03-2017, 04:23 PM
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Originally Posted by cegilmore View Post
Current set up is on a 22 ft bay boat with a 2007 225 hp Etec. I currently have 3 batteries, two deep cycle batteries for a trolling motor and a starting battery for everything else.

Everything else includes a Lowrance HDS 10, vhf, baitwell pump, power pole and jack plate that are always used when I’m on the boat. In addition, I occasionally use my live well pump and navigation lights. All of this ran off of the starting batter.

I have the typical off-1-2-both battery switch that is wired to allow for one of the trolling motor batteries to be combined with the starting battery if needed. I also have a three bank on-board battery charger with one lead hooked to each battery to keep the batteries charged.

So far, I have not had any problems with this set up. However, I have decided to add a stereo, speakers, and amp to the boat. I don’t think my current battery set up will be sufficient so I want to add an additional house battery for all the electronics and isolate the starting battery for only starting the engine.

I have considered replacing the starting battery with another deep cycle battery that is connected to the power distribution system, then connect the stereo and amp to that. My existing three bank battery charger would be used to charge the three deep cycle batteries. I would then connect the motor’s power leads to the starting battery. I would think that the Etec could keep the starting battery charged but I could also add a single bank battery charger if needed. This would completely isolate the starting battery from everything else.

The other option I have considered is to use the Blue Sea Add a Battery kit. I would add the ACR between the existing starting battery and a new deep cycle battery. My concern with this system is that I am not sure if it would completely isolate the starting battery.

Any other suggestions on either option or any suggestions on how best to add a new house battery?

Thanks!
The (house) battery that is running your stereo, sonar, lights, etc. will need to get a charge from somewhere. From what you mentioned you are looking at either having a onboard charger for the house battery or using an ACR.

Onboard charger:
You would HAVE to plug this in every single time you get home to ensure the house battery stays topped off. This is doable but seems like a pain to me

ACR:
The house battery will receive a charge anytime the outboard is running. This means you NEVER have to charge it at the house.

The start battery IS completely isolated when using the ACR. Here is how the ACR works..

The outboard is the only thing wired to the start battery
ALL other electronics wired to the house battery.
The ACR gets installed in between the two batteries.

The ACR connects the 2 batteries when the outboard is running and disconnects them when the outboard is off. That way when the motor is running the house battery can get a charge off the alternator. You can completely drain your house battery with the outboard off and still use the crank battery because they are isolated from each other.

When you crank your outboard the voltage in the crank battery will rise from 12ish volts to 14ish volts. When the ACR senses the voltage increase it connects the batteries (allowing the house battery to receive its charge). When you shut off your motor the voltage in the crank battery drops from 14ish colts to 12ish volts. The ACR senses the voltage drop and disconnects the two batteries. Isolating them from each other.

I would go with an ACR over having a single bank charger for the house battery...
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Old 12-04-2017, 04:39 AM
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Is your trolling motor 24v? Do you find you draw those batteries down each time out?

I would be trying to utilize the trolling bank as house but 24v may pose problems. Although your new stereo may be 12-24v.

4 batteries in a bay boat just seems overkill.
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Old 12-04-2017, 04:57 AM
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I have 5.... 3 TM batts, crank, and house.

I run 20+ miles offshore 20-30 times a year. I don't mind "overkill" especially when offshore.....

Last edited by mdees88; 12-04-2017 at 05:05 AM.
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Old 12-04-2017, 05:56 AM
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Originally Posted by mdees88 View Post
I have 5.... 3 TM batts, crank, and house.

I run 20+ miles offshore 20-30 times a year. I don't mind "overkill" especially when offshore.....
Agree with this. This is fairly typical for any boat with a 36V trolling motor and not overkill at all. Trolling motor system is isolated from the house and start system.
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Old 12-04-2017, 05:59 AM
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Originally Posted by mdees88 View Post
The (house) battery that is running your stereo, sonar, lights, etc. will need to get a charge from somewhere. From what you mentioned you are looking at either having a onboard charger for the house battery or using an ACR.

Onboard charger:
You would HAVE to plug this in every single time you get home to ensure the house battery stays topped off. This is doable but seems like a pain to me

ACR:
The house battery will receive a charge anytime the outboard is running. This means you NEVER have to charge it at the house.

The start battery IS completely isolated when using the ACR. Here is how the ACR works..

The outboard is the only thing wired to the start battery
ALL other electronics wired to the house battery.
The ACR gets installed in between the two batteries.

The ACR connects the 2 batteries when the outboard is running and disconnects them when the outboard is off. That way when the motor is running the house battery can get a charge off the alternator. You can completely drain your house battery with the outboard off and still use the crank battery because they are isolated from each other.

When you crank your outboard the voltage in the crank battery will rise from 12ish volts to 14ish volts. When the ACR senses the voltage increase it connects the batteries (allowing the house battery to receive its charge). When you shut off your motor the voltage in the crank battery drops from 14ish colts to 12ish volts. The ACR senses the voltage drop and disconnects the two batteries. Isolating them from each other.

I would go with an ACR over having a single bank charger for the house battery...
This is the unit I'm referring to that is a charger/ACR all in one. Saves space from having to wire both.

https://www.bluesea.com/products/765...rth_America%5D
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Old 12-04-2017, 12:41 PM
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Originally Posted by davepjr71 View Post
This is the unit I'm referring to that is a charger/ACR all in one. Saves space from having to wire both.

https://www.bluesea.com/products/765...rth_America%5D
That is pretty cool, never seen it before.... only thing is I think they only make one with the "mini" 65a add a battery... not the 120a kit
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Old 12-05-2017, 04:05 AM
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Originally Posted by mdees88 View Post
That is pretty cool, never seen it before.... only thing is I think they only make one with the "mini" 65a add a battery... not the 120a kit
Yes you are correct. The 65A limit may be an issue for many.
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