Author Topic: Wiring up 2 batteries...what will this do?  (Read 1275 times)

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Offline betadog808

Wiring up 2 batteries...what will this do?
« on: February 06, 2018, 12:42:16 PM »
Hey guys,
   I was thinking of wiring up a second battery for my boat where I could have one for starting and one for accessories...At the moment I only have a Blue Sea System 1, 2, 1/2, and off switch. I believe this wiring scheme will work, but I think in the config, my accessory battery will also pull from the starter battery, correct?

Is there a way to have it so I can charge both batteries from the engine but be able to use the acc battery without drawing from the starter battery?  Otherwise, maybe I'll just have the acc battery totally separate and charge before each outing. 

Forgive my drawing...and yah, that is a AM/FM radio on the bottom left... :biggrin:

Thanks!


upload temporary image
« Last Edit: February 06, 2018, 01:03:55 PM by betadog808 »

Offline Threeweight

Re: Wiring up 2 batteries...what will this do?
« Reply #1 on: February 06, 2018, 02:11:56 PM »
Use a Blue Sea Add-A-Battery kit, with their automatic charging relay (ACR).  It will isolate the Starting and House batteries when the engine(s) are off (or starting), but connect them to share the charging output of the motor when the engine is running.

If that is a Blue Sea switch in your diagram, you would have an unswitched (no way to shut-off) connection to Battery #1, while the engine only charges one battery at a time.  You want a switch of some kind as close the battery as possible on almost all of your loads, so that in case of a short of catastrophic wiring failure you can shut off power to as much of the wiring as possible and reduce the risk of a fire.  Exceptions are a single VHF radio and a single bilge pump.

Here's the wiring diagram for the Add-A-Battery kit:

« Last Edit: February 06, 2018, 02:16:18 PM by Threeweight »
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Offline Holoholo808

Re: Wiring up 2 batteries...what will this do?
« Reply #2 on: February 06, 2018, 03:32:10 PM »
Not a huge issue but the Blue Sea ACR will not provide start isolation unless you have a signal (12 VDC usually from your starting/ignition circuit) going to it. The issue there (probably more prevalent with higher HP engines with high starting current) is that, if the batteries are combined, you can have a system voltage drop that could  damage electronics.

This is mostly academic but definitely a possibility. I’m sure a couple of the resident electrical gurus can chime in regarding the risks of not hooking up the wire to start isolation.

I checked with the good Honda mechanic here (I doubt WB would know) regarding where to tap off of the starting circuit for the isolation signal and he of course recommended not to tap into the harness on the controls side.

I’ve been bad and didn’t hook up the start isolation and haven’t had any issues yet...

I went the Blue Sea ACR route so let me know if you want to check it out in person.
1611 SC Honda BF90D

For easier searching go to Google and type "site:www.arimaowners.com (search term)"

Offline Diablo

Re: Wiring up 2 batteries...what will this do?
« Reply #3 on: February 06, 2018, 05:50:44 PM »
Not a huge issue but the Blue Sea ACR will not provide start isolation unless you have a signal (12 VDC usually from your starting/ignition circuit) going to it. The issue there (probably more prevalent with higher HP engines with high starting current) is that, if the batteries are combined, you can have a system voltage drop that could  damage electronics.

This is mostly academic but definitely a possibility. I’m sure a couple of the resident electrical gurus can chime in regarding the risks of not hooking up the wire to start isolation.

I checked with the good Honda mechanic here (I doubt WB would know) regarding where to tap off of the starting circuit for the isolation signal and he of course recommended not to tap into the harness on the controls side.

I’ve been bad and didn’t hook up the start isolation and haven’t had any issues yet...

I went the Blue Sea ACR route so let me know if you want to check it out in person.

The ARC is only closed combining the batteries when a charging source is available. So when you are on the water when you start you will only draw from the start battery. The exception to that is if your trolling motor was running and charging the bats.
Most dual battery switches allow you to combine the batteries if you need to. Now if that was because your start battery was dead the start battery should be isolated with another switch for the just the start battery or pulling the start battery fuse. That would keep the start battery from drawing down the house battery (acc).
'98 19SR  '15 E Tec 115, '10 Honda 8
'88 17SR  '90 Johnson 90, Honda 8, SOLD

Offline Holoholo808

Re: Wiring up 2 batteries...what will this do?
« Reply #4 on: February 06, 2018, 07:28:38 PM »

The ARC is only closed combining the batteries when a charging source is available. So when you are on the water when you start you will only draw from the start battery. The exception to that is if your trolling motor was running and charging the bats.
Most dual battery switches allow you to combine the batteries if you need to. Now if that was because your start battery was dead the start battery should be isolated with another switch for the just the start battery or pulling the start battery fuse. That would keep the start battery from drawing down the house battery (acc).

Thanks for clearing that up. I got confused with another old thread about house voltage problems and electronics failures.

Looked up the techs specs on the Blue Sea site and the ACR won’t combine until it sees above 13 (or 13.6 depending on what page you look at) volts for 30 seconds. Its basically taking the human out of the equation as far as combining or isolating the batteries and in a lot of cases that’s a good thing. :doh:
1611 SC Honda BF90D

For easier searching go to Google and type "site:www.arimaowners.com (search term)"

Offline betadog808

Re: Wiring up 2 batteries...what will this do?
« Reply #5 on: February 09, 2018, 08:04:06 PM »
Thanks guys...Can someone with electrical knowledge explain why in my diagram both batteries don't drain together(unless I'm in 1+2) as the negatives are always connected regardless of which battery positive I connect to?

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #6 on: February 09, 2018, 08:14:46 PM »
Both batteries drain but one is recharged by the motor.

2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #7 on: February 09, 2018, 08:18:21 PM »
 The start battery drains when the motor is cranked over... but once running is topped up by the motor charging system.

The ACC battery will only drain unless you switch it to the main engine to charge.

This is why three weight is advising you to use a ACR is that both batteries are recharged while having the protection to keep you start battery isolated.


Dev
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline GregE

Re: Wiring up 2 batteries...what will this do?
« Reply #8 on: February 09, 2018, 10:31:47 PM »
When 3 Wt speaks........  listen   :biggrin:
Greg
Osprey 26 LC Kodak;  Arima SR 19 HT; SL 22 Honda 225
http://www.sagecreekforums.com/phpforum/index.php
Sold:  Arima SE 16 WeeBait; SH 15 WeeBoat;
SR 21 NoBait;  SL 22 ReBait

Offline betadog808

Re: Wiring up 2 batteries...what will this do?
« Reply #9 on: February 09, 2018, 10:59:23 PM »
Weird...from what research I've been able to find, if you have the switch in the correct position, you can charge either or both.  And depending on the switch position, you can have the accessory stuff drain from just the accessory battery and spare the starter battery.  I just wanted to understand why as the negatives are always connected...

Offline Threeweight

Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #11 on: February 10, 2018, 07:55:15 AM »
Weird...from what research I've been able to find, if you have the switch in the correct position, you can charge either or both.  And depending on the switch position, you can have the accessory stuff drain from just the accessory battery and spare the starter battery.  I just wanted to understand why as the negatives are always connected...

The negative (B-) are common between both batteries, charging system (B-) and the block of your motor.

The positive side is where the switching is done.

I strongly do not recommend combining batteries this is only a “Hail Mary” option to get you started....if one of your batteries is shorted it can damage the other by combining (putting them in parallel).
This is why the ACR is recommend as it will only combine when safe conditions in both batteries are present (safety combine both your batteries with one charge source).

Yes you can charge either battery one at a time with the switch but I do not recommend combining...unless you have voltmeters on both batteries and know what you are doing.



Dev

« Last Edit: February 10, 2018, 08:06:15 AM by DevMah »
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline Packman

Re: Wiring up 2 batteries...what will this do?
« Reply #12 on: February 10, 2018, 01:37:53 PM »
I would eliminate the switch in the Blue Seas diagram. That is what I have, the batteries are connected by the isolator, when the engine is on both batteries get charged, when the engine is off the batteries are separated (when the voltage between them drops below 13 volts or so).  I do have a switch that will combine both batteries in the case of the starter battery not having enough juice to start the engine.  Simple and automatic, I have never had a problem with this setup.  I renew my Optima batteries every 5 years or so.
Sea Ranger 19, Mercury 115 4-stroke

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #13 on: February 10, 2018, 02:19:01 PM »
I would eliminate the switch in the Blue Seas diagram. That is what I have, the batteries are connected by the isolator, when the engine is on both batteries get charged, when the engine is off the batteries are separated (when the voltage between them drops below 13 volts or so).  I do have a switch that will combine both batteries in the case of the starter battery not having enough juice to start the engine.  Simple and automatic, I have never had a problem with this setup.  I renew my Optima batteries every 5 years or so.

This can be done with ACR also, please note that a isolator will have 0.6 to 0.7 volts dropped each Diode junction.
They both work well but the ACR is more common on outboard installs.


http://info.waytekwire.com/blog/battery-isolators-vs.-automatic-charging-relays-acrs-thursday-throwdown

https://www.bluesea.com/resources/58/Battery_Isolators_and_Automatic_Charging_Relays

https://www.bluesea.com/resources/1366

Dev

« Last Edit: February 10, 2018, 02:26:58 PM by DevMah »
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #14 on: February 10, 2018, 02:36:35 PM »
I would eliminate the switch in the Blue Seas diagram. That is what I have, the batteries are connected by the isolator, when the engine is on both batteries get charged, when the engine is off the batteries are separated (when the voltage between them drops below 13 volts or so).  I do have a switch that will combine both batteries in the case of the starter battery not having enough juice to start the engine.  Simple and automatic, I have never had a problem with this setup.  I renew my Optima batteries every 5 years or so.

FYI
Isolators operate like one way check valves, they have no voltage sensing between batteries.
A isolator is just two diodes back to back, to forward biased a PN junction it takes approximately 0.7 v (open the check valve).
So for a alternator to charge a battey with a isolater the charge voltage has to be 0.7 v higher than the battery voltage.
On outboard engines at low RPMs most times the voltage dose not exceed this threshold... so no charging could occur... VS a ACR has no voltage drop so it is able to charge at lower voltages.

A 12v battery has a open circuit voltage of approximately 12.6 to 12.7 v so for a isolater to charge you will need to exceed 13.4v ( 12.7 v+ 0.7 v)
Dev
« Last Edit: February 10, 2018, 03:47:02 PM by DevMah »
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline SB Steve

Re: Wiring up 2 batteries...what will this do?
« Reply #15 on: February 10, 2018, 05:24:57 PM »
Forgive my questions, as they have been likely answered in this thread, but I still a little confused as to how the ACR works and which battery/switch combo I should use.  I have been going over the blue seas diagrams as I diagram my re-wiring project.

I presently have a start battery and house battery hooked up to a 4-way switch (1/2/both/off) with no ACR.  I assume that with this set-up only the battery that is switched on is being utilized and charged.  (with the exception of bilge pump which is straight wired to one of the batteries for example)

Most of the blue seas diagrams I have seen using an ACR use the 3-way battery switch (1/combine/off) with 4 terminals compared to the 4-way switch with 3.  If I am not mistaken, this system charges both batteries as needed.  I assume when it is switched to 1, the start battery allows draw to the motor and also activates the house battery for all other functions.  The combine feature is only used in emergencies. 

I guess my question is how will an ACR work with the 4-way switch, or should I consider getting a 3-way instead?  Does the ACR have to be also be connected to the ignition wire to work properly?

On side note, what else should be straight wired to the house battery other than the bilge...VHF?

Hope my questions make sense, it is probably something simple that I am just not getting.


Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #16 on: February 10, 2018, 05:59:14 PM »
Hope this sheds some light
I am going to answer this as I go through your post

Forgive my questions, as they have been likely answered in this thread, but I still a little confused as to how the ACR works and which battery/switch combo I should use.  I have been going over the blue seas diagrams as I diagram my re-wiring project.

I presently have a start battery and house battery hooked up to a 4-way switch (1/2/both/off) with no ACR.  I assume that with this set-up only the battery that is switched on is being utilized and charged.  (with the exception of bilge pump which is straight wired to one of the batteries for example)

correct only the battery selected to the engine is being charged.



Most of the blue seas diagrams I have seen using an ACR use the 3-way battery switch (1/combine/off) with 4 terminals compared to the 4-way switch with 3.  If I am not mistaken, this system charges both batteries as needed.  I assume when it is switched to 1, the start battery allows draw to the motor and also activates the house battery for all other functions.  The combine feature is only used in emergencies. 

correct

I guess my question is how will an ACR work with the 4-way switch, or should I consider getting a 3-way instead?  Does the ACR have to be also be connected to the ignition wire to work properly?
  The 4way has four positions off, battery 1, battery 2, and combine. You can use the 4 position but your are limited to having your house and start on the common pole, or you can add a second switch off the ACC battery.

The ACR is wired across both batteries, it dose not care if you are on battery 1 or 2, it will combine when it sees a charge voltage at either battery.



On side note, what else should be straight wired to the house battery other than the bilge...VHF?
any device that requires memory


Dev
« Last Edit: February 10, 2018, 06:04:22 PM by DevMah »
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline SB Steve

Re: Wiring up 2 batteries...what will this do?
« Reply #17 on: February 10, 2018, 06:16:34 PM »
Hope this sheds some light
I am going to answer this as I go through your post

Forgive my questions, as they have been likely answered in this thread, but I still a little confused as to how the ACR works and which battery/switch combo I should use.  I have been going over the blue seas diagrams as I diagram my re-wiring project.

I presently have a start battery and house battery hooked up to a 4-way switch (1/2/both/off) with no ACR.  I assume that with this set-up only the battery that is switched on is being utilized and charged.  (with the exception of bilge pump which is straight wired to one of the batteries for example)

correct only the battery selected to the engine is being charged.



Most of the blue seas diagrams I have seen using an ACR use the 3-way battery switch (1/combine/off) with 4 terminals compared to the 4-way switch with 3.  If I am not mistaken, this system charges both batteries as needed.  I assume when it is switched to 1, the start battery allows draw to the motor and also activates the house battery for all other functions.  The combine feature is only used in emergencies. 

correct

I guess my question is how will an ACR work with the 4-way switch, or should I consider getting a 3-way instead?  Does the ACR have to be also be connected to the ignition wire to work properly?
  The 4way has four positions off, battery 1, battery 2, and combine. You can use the 4 position but your are limited to having your house and start on the common pole, or you can add a second switch off the ACC battery.

The ACR is wired across both batteries, it dose not care if you are on battery 1 or 2, it will combine when it sees a charge voltage at either battery.



On side note, what else should be straight wired to the house battery other than the bilge...VHF?
any device that requires memory


Dev
Cheers Dev!   :beerchug:

Glad I was not totally barking up the wrong tree.  It seems that when I do my re-wiring, I should go with the 3-way battery switch in order to utilize the ACR and Start battery as intended.
« Last Edit: February 10, 2018, 06:26:14 PM by SB Steve »

Offline diodon

Re: Wiring up 2 batteries...what will this do?
« Reply #18 on: February 10, 2018, 08:40:00 PM »
 :applause:
2007 21 Sea Explorer.   2007 Suzuki DF140.        2011 Honda 9.9

Offline Threeweight

Re: Wiring up 2 batteries...what will this do?
« Reply #19 on: February 11, 2018, 10:55:23 AM »
On the switch in the diagram I posted, there is no "1" setting... it is "on, off, combined".  On works as you described... starting battery connected to motor, house battery connected to accessory loads, but both circuits isolated from each other.  The ACR functions as the "bridge" between the two circuits to share charging current  from the motor(s), but only connects them when it detects the proper conditions, then cuts out when conditions are not met.

On a smaller Arima, I think the Blue Sea Add-A-Battery "mini" is all you need (for motors putting out 65 amps or less from their alternator).  Bigger applications, or if you want overkill, the full size Add-A-Battery is rated for up to 120 amps.  I used the full size on my old Arima 17 with my 90 Suzi, and now on my tin can with the big Honda 225.  If the mini had been available, I'd have used it on the Arima as it is a little more space efficient. 
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #20 on: February 11, 2018, 12:03:11 PM »
 I’m glad you mentioned that 3WT. I was trying to decide if the mini was ok for my application. My motor has 27 amps alternater, and 22 amp battery charging power. So the mini should be the correct size for my application correct? I currently have only one battery with no switches at all. So if I add a second battery is that all I need is that Blue Sea add a battery mini kit with ACR? Thx
2018, Sea Chaser 16, Honda 60HP

Offline Threeweight

Re: Wiring up 2 batteries...what will this do?
« Reply #21 on: February 11, 2018, 12:51:28 PM »
The kit + cables + the battery.
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #22 on: February 11, 2018, 03:23:11 PM »
Would both batteries have to be of the same type and CCA rating? Can I add one “new” battery and still use my current battery with that mini blue sea ACR kit? I was was under the assumption that it’s not a good idea to mix new and used :shrug9: Or does it not matter with that ACR mini kit?
2018, Sea Chaser 16, Honda 60HP

Offline SB Steve

Re: Wiring up 2 batteries...what will this do?
« Reply #23 on: February 11, 2018, 03:32:23 PM »
On the switch in the diagram I posted, there is no "1" setting... it is "on, off, combined".  On works as you described... starting battery connected to motor, house battery connected to accessory loads, but both circuits isolated from each other.  The ACR functions as the "bridge" between the two circuits to share charging current  from the motor(s), but only connects them when it detects the proper conditions, then cuts out when conditions are not met.

On a smaller Arima, I think the Blue Sea Add-A-Battery "mini" is all you need (for motors putting out 65 amps or less from their alternator).  Bigger applications, or if you want overkill, the full size Add-A-Battery is rated for up to 120 amps.  I used the full size on my old Arima 17 with my 90 Suzi, and now on my tin can with the big Honda 225.  If the mini had been available, I'd have used it on the Arima as it is a little more space efficient.
Good call 3WT.  I will only need the mini.  My motor puts out less than 40 amps.  It will save me $ and space!

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #24 on: February 11, 2018, 03:36:20 PM »
Would both batteries have to be of the same type and CCA rating? Can I add one “new” battery and still use my current battery with that mini blue sea ACR kit? I was was under the assumption that it’s not a good idea to mix new and used :shrug9: Or does it not matter with that ACR mini kit?

I recommend that they should be... but I have seen many installs with non matching batteries.

https://www.optimabatteries.com/en-us/experience/2014/04/can-i-connect-dissimilar-batteries-parallel


Dev
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #25 on: February 11, 2018, 03:39:51 PM »
On the switch in the diagram I posted, there is no "1" setting... it is "on, off, combined".  On works as you described... starting battery connected to motor, house battery connected to accessory loads, but both circuits isolated from each other.  The ACR functions as the "bridge" between the two circuits to share charging current  from the motor(s), but only connects them when it detects the proper conditions, then cuts out when conditions are not met.

On a smaller Arima, I think the Blue Sea Add-A-Battery "mini" is all you need (for motors putting out 65 amps or less from their alternator).  Bigger applications, or if you want overkill, the full size Add-A-Battery is rated for up to 120 amps.  I used the full size on my old Arima 17 with my 90 Suzi, and now on my tin can with the big Honda 225.  If the mini had been available, I'd have used it on the Arima as it is a little more space efficient.

We mainly install the mini on smaller outboards, all large outboards and inboards get the larger ACR.
Please follow the instructions for fusing and wiring.

Dev
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline Threeweight

Re: Wiring up 2 batteries...what will this do?
« Reply #26 on: February 11, 2018, 04:18:32 PM »
My Suzi's charging output was 27 amps.  The big Honda is rated at 90 amps.
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #27 on: February 11, 2018, 06:44:20 PM »
With the blue sea/ACR kit can you still hook up a dual battery maintainer directly to the batteries while stored?
2018, Sea Chaser 16, Honda 60HP

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #28 on: February 11, 2018, 06:47:34 PM »
With the blue sea/ACR kit can you still hook up a dual battery maintainer directly to the batteries while stored?

Yes I have a Marinco dual output charger hooked up to mine, you can even have a single bank also as the ACR will combine and charge both batteries.


Dev
« Last Edit: February 11, 2018, 06:55:04 PM by DevMah »
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #29 on: February 11, 2018, 07:14:12 PM »
With the blue sea/ACR kit can you still hook up a dual battery maintainer directly to the batteries while stored?

Yes I have a Marinco dual output charger hooked up to mine, you can even have a single bank also as the ACR will combine and charge both batteries.


Dev
So if using a single bank charger/maintainer would you only need to hook it up directly to one battery and it will charge both? And the ACR will distribute charge to the battery that needs it?
2018, Sea Chaser 16, Honda 60HP

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #30 on: February 11, 2018, 07:23:42 PM »
With the blue sea/ACR kit can you still hook up a dual battery maintainer directly to the batteries while stored?

Yes I have a Marinco dual output charger hooked up to mine, you can even have a single bank also as the ACR will combine and charge both batteries.


Dev
So if using a single bank charger/maintainer would you only need to hook it up directly to one battery and it will charge both? And the ACR will distribute charge to the battery that needs it?

The ACR only combines the batteries and will charge both , however it dose not manage the charge to battery needs.


https://www.bluesea.com/resources/1366

Installing a ACR with a single bank charger

https://www.bluesea.com/resources/57

Installling a ACR with multi bank charger

https://www.bluesea.com/resources/504

Or you can buy the new all in one ACR and dual bank charger.

https://www.bluesea.com/products/7605/10A_BatteryLink_Charger_%5BNorth_America%5D



Dev
« Last Edit: February 11, 2018, 07:55:00 PM by DevMah »
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #31 on: February 11, 2018, 07:55:47 PM »
Awesome Dev, thank you! Looks like the single output charger connected to one of the batteries is the easier option
2018, Sea Chaser 16, Honda 60HP

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #32 on: February 11, 2018, 07:58:51 PM »
Yes, I have had no complaints yet...

Dev
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #33 on: February 12, 2018, 11:03:44 AM »
Is it better to leave the battery/batteries on the charger/maintainer at all times while stored or just charge every week or 2?
2018, Sea Chaser 16, Honda 60HP

Offline Threeweight

Re: Wiring up 2 batteries...what will this do?
« Reply #34 on: February 12, 2018, 11:37:10 AM »
With one of the modern charger/maintainers, you can leave them plugged in all the time. 

Personally, I prefer to wire my ACR off the "output" side of the Blue Sea switch, so it is only able to bridge the batteries when the switch is "on", and then run my 2 bank Marinco charger off the battery posts (well actually, the Blue Sea battery terminal fuse blocks).  The Marinco charger is a "smart" charger, which can vary it's charging output to each battery individually.  Perhaps a non-issue, but I worry about having an ACR connecting the two batteries and interfering with the function of the charger.

Would be interested in hearing DevMah's thoughts on this.

 
Former Sea Chaser 17 owner
Wild Card, Hewescraft Ocean Pro 220, Honda 225 and 9.9

“Never turn your back on fear. It should always be in front of you, like a thing that might have to be killed.”
       --- Hunter S. Thompson

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #35 on: February 12, 2018, 12:37:53 PM »
With one of the modern charger/maintainers, you can leave them plugged in all the time. 

Personally, I prefer to wire my ACR off the "output" side of the Blue Sea switch, so it is only able to bridge the batteries when the switch is "on", and then run my 2 bank Marinco charger off the battery posts (well actually, the Blue Sea battery terminal fuse blocks).  The Marinco charger is a "smart" charger, which can vary it's charging output to each battery individually.  Perhaps a non-issue, but I worry about having an ACR connecting the two batteries and interfering with the function of the charger.

Would be interested in hearing DevMah's thoughts on this.

 

My boat is wired similar as one side of the ACR is wired to the switch ( batt 1 is wired directly to the ACR VIA MRBF fuses-  The other side of the ACR is wired to pole #2 of the switch VIA MRBF fuses.) With the switch off the loop for the ACR is broken.

I also have the same Marinco two bank smart charger, and yes it on all the time when the boat is moored or stored.

IMO
This is the best method as each battery is charged individually and regulated ....no overcharging can occur.

Now saying that I have never heard of a issue going to a single bank smart charger or trickle.

Dev
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #36 on: February 12, 2018, 02:29:58 PM »
Would this be a good way to do mine on my little 16 SC? This is the add-a-battery mini. Then when stored hook up my single bank Noco battery maintainer to one of the batteries? Which one would I hook the charger directly to? Starting or house battery? I’m thinking of doing it exactly like this diagram. Thoughts/comments?
2018, Sea Chaser 16, Honda 60HP

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #37 on: February 12, 2018, 03:31:42 PM »
Would this be a good way to do mine on my little 16 SC? This is the add-a-battery mini. Then when stored hook up my single bank Noco battery maintainer to one of the batteries? Which one would I hook the charger directly to? Starting or house battery? I’m thinking of doing it exactly like this diagram. Thoughts/comments?


House battery or main... either the ACR will combine at either battery.


Here is a link on how the ACR kit works

http://catalog.bluesea.com/files/assets/common/downloads/page0045.pdf

Dev
« Last Edit: February 12, 2018, 03:44:02 PM by DevMah »
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline Fishin Machine

Re: Wiring up 2 batteries...what will this do?
« Reply #38 on: February 12, 2018, 08:09:19 PM »
Would this work with a bilge pump. My bilge pump does not automatically turn on. How does a bilge pump get wired with two batteries?

The other issue is, after trolling a half of day using my TR-1 and kicker motor tends to drain the battery. I figured it is because the TR-1, fish finder, VHF radio, FM radio and maybe a cell phone is the reason. The kicker motor does not have an alternator.

FM
DDT
2003 19' Sea Ranger

Online Fisherdv

Re: Wiring up 2 batteries...what will this do?
« Reply #39 on: February 12, 2018, 08:13:04 PM »
I would wire the bilge pump directly to one of the batteries with an in-line fuse and to a switch on the panel. Maybe Dev could explain
2018, Sea Chaser 16, Honda 60HP

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #40 on: February 12, 2018, 09:18:24 PM »
Would this work with a bilge pump. My bilge pump does not automatically turn on. How does a bilge pump get wired with two batteries?

The other issue is, after trolling a half of day using my TR-1 and kicker motor tends to drain the battery. I figured it is because the TR-1, fish finder, VHF radio, FM radio and maybe a cell phone is the reason. The kicker motor does not have an alternator.

FM
See attached dwg from ABYC E-11

Here are you options for you battery drain
-install larger batteries
-Add a 3rd battery
-Install a rectifier kit to your kicker

Yes it sounds like you have high draw but no way to recharge while running.

Please note  the bilge pump must have a float switch if leaving un-attended.
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #41 on: February 12, 2018, 09:59:38 PM »
I would wire the bilge pump directly to one of the batteries with an in-line fuse and to a switch on the panel. Maybe Dev could explain

Yes, to a deep cycle if possible.

2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold

Offline GHMariner

Re: Wiring up 2 batteries...what will this do?
« Reply #42 on: February 13, 2018, 05:16:11 AM »
Thanks guys...Can someone with electrical knowledge explain why in my diagram both batteries don't drain together(unless I'm in 1+2) as the negatives are always connected  regardless of which battery positive I connect to?

Because current doesn't flow through the negative side of the circuit.

Thats not technically correct, but it's the best way I can explain the answer to your question

Offline DevMah

Re: Wiring up 2 batteries...what will this do?
« Reply #43 on: February 13, 2018, 07:57:10 PM »
Usually B- is connected to ground (unless you have a floating voltage system) as it is considered zero volts. For this reason the B+ or AC hot has the switch is connected (the potential difference ).  You want to be able to remove the potential difference from the load (remove power from the system). If you switched on the negative side you could have a arc to ground or not be able to shut the load off (isolate)as most systems are negative grounded.

It is common practice to switch the potential difference  and remove the potential difference voltage, not the zero voltage point. (so that there is no voltage (potential difference) present.)

I use this term (potential difference) as we use +/- dc voltages to switch in PLC system and ACV, as is dose not mean a positive voltage just a difference from zero. Any voltage being positive or negative ( - or + potential difference) and not zero will cause current flow.

If my above explaination is confusing the simple answer is you want to switch the hot side off not the zero side. B- and ground/neutral equal zero volts.


So to answer your question both B- poles equals zero voltage and no potential difference.
Dev
2015 21' Sea Ranger
2015 Yamaha F150
2013 Mercury 9.9 Bigfoot 4 blade
2012 Lund 1650SS  w 2012 60HP Mercury-Sold