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Twin outboard/2 batts and wiring/hardware suggestions

Old 12-06-2013, 04:34 PM
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Default Twin outboard/2 batts and wiring/hardware suggestions

I fully admit I'm in the gray zone here and above my pay grade on how to advise my neighbor on wiring up his twin simply b/c I don't know of the complexities or potential issues that having an extra engine in the mix might add.

What I really want to do is be able to send him on a shopping trip to buy the selector switch and charging bank on his own and then take it to the marina. The local boys mark up hardware right at 2x so it's best if we can shop on our own. Currently his boat has 2 marine batts wired up to the port/starboard with no selectors or chargers. Does it even make sense to have a 3rd batt with twins or is that over kill? I figured since he is taking the time and money to get it wired up he may as well consider all the 'best' options to make it as good as it can be. Feel free to offer up any advice or potential pitfalls please.

I have done some Googling on 'twin engine/twin battery' and not finding too many useful diagrams or articles so figured I'd come here to let the pros direct me. Thanks in advance for any make/model input, wiring or otherwise.
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Old 12-06-2013, 05:39 PM
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The minimum practice is to have a separate battery for Engines, and a separate battery for House. The optimum/best is to have separate battery *per* engine and a separate battery for House. And depending on how much electronics in the boat, one might require/need more house batteries (connected in Parallel).
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Old 12-06-2013, 05:45 PM
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PS. If you need to charge the batteries with a shore charger, with the above circuit, you'd only need a single output charger connected to ANY single battery and the ACR will automatically charge ALL batteries.

ie, if you connect the charger to House Battery, it will charge both Engine batteries as well.
ie, if you connect the charger to Port Engine battery, it will charge the House Battery then the Starboard Engine Battery.

There is a minimal voltage drop across the ACR, it is negligible.

We dont use a shore power charger - there is no shore power where we park. We use Solar Charger.
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Old 12-06-2013, 06:16 PM
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Originally Posted by ragnakore View Post
The minimum practice is to have a separate battery for Engines, and a separate battery for House. The optimum/best is to have separate battery *per* engine and a separate battery for House. And depending on how much electronics in the boat, one might require/need more house batteries (connected in Parallel).
Wow this is more than I could have hoped for thank you!

I think this is pretty much exactly what he wants and needs. He does not have a large number of ancillary devices. A radio and a couple of bilge pumps.

Ok I just found out a few more things. He has a 2 plug GFI on the end of his dock so he has access to power. He's so tired of toting his charger down to the boat he is just dying to get a 'plug and play' charging setup. Here is his perfect world. Pull boat up on lift, grab extension cord and plug one end into the AC power on the dock and the other into a receptacle on his console somewhere.

Knowing that and if I could trouble you for your expertise again, what does my exact shopping list look like please?

1 each PN 6011(does that come with 2 switches? Or is the switch on the diagram under the 'house' wiring a separate part number?

2 each 7610 ACR

Suggestions on the charging setup for his 'perfect' charging setup?

Thank you so much this is just awesome help and I'm very grateful.
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Old 12-06-2013, 06:37 PM
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I have the exact same set up as listed above with my twin etecs. It works very well however I will be replacing the acr with an etec auxiliary charging cable. If his outboards have auxiliary charging capability, I would recommend that over the acr's.
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Old 12-06-2013, 07:12 PM
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What brand of motors and what is the model?
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Old 12-06-2013, 09:41 PM
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I installed this on my boat back in 2007. Love it.

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Old 12-07-2013, 01:25 AM
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The switch on the right (for house) is any *basic* ON-OFF switch (PN 9003e). I am sure your boat already have at least a similar switch which you can reuse.

As for a charging setup, follow the updated diagram.

The beauty of using the above parts is that, you only need a single output charger to charge ALL batteries. No need to buy a 2 Bank Charger, or a 3 Bank charger or whatever. Just buy a 5A (or 10A) Battery Charger, and connect it directly to a battery; and the ACR will do the rest to charge the other batteries.

PS. A friend suggested to me that with the above diagram, it is best to hook up the charger to one of the Start battery as opposed to connecting it to the House. His reason is that, by connecting it to Start Battery (say Port Engine battery), the Charger will charge that battery first, then the house, then the other engine battery *in-that-order*. In my diagram, the Charger will charge the House, then charge *both Engine batteries* at the same time which in his opinion, is not going to be sufficient.

BTW.. BEP also have the same devices as BlueSea's; I used BlueSea on my boat and simply do not know the corresponding parts for BEP brand. BEP nonetheless is a good brand too. And should you want to go BEP, you can use the same diagram.
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Old 12-07-2013, 01:42 AM
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If you are going for BEP (as shown with Back-in-Black's photo):
Get 4 x BEP 701 Switch. This is a simple ON-OFF switch. 1 switch for the House, 1 switch for Port Engine, 1 switch for Starboard Engine, and 1 switch for Paralleling of Start Batteries together.
Get 2 x BEP SKU:710-140A. This has same functionality of BlueSea 7610.
Buy the appropriate Labels for your BEP switches or you can just write it down with a Permanent Ink Marker.

Another thing I forgot to mention: BEP's devices are square. You can install them side-by-side (as shown with Back-in-Black's photo). The connections between are simple conductor plates and is hidden. Makes for a neater installation.
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Old 12-07-2013, 09:32 AM
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The diagram shows fuse protection for the starting batteries, yet none on the
house battery. I believe ABYC regs are just the opposite, with over-current protection mandatory for the house battery and optional for the starting batteries.
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Old 12-07-2013, 12:16 PM
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Originally Posted by rwadsworth33 View Post
I have the exact same set up as listed above with my twin etecs. It works very well however I will be replacing the acr with an etec auxiliary charging cable. If his outboards have auxiliary charging capability, I would recommend that over the acr's.
I did the same with twin yamaha's with a kicker…certainly an option instead of going with ACR's or VSR's. I put together a 4 battery setup that works for me…but it's very similar to 3 batteries...I simply select between 2 house batteries and have each one connected with an aux lead to one of the F150's.
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Old 12-07-2013, 02:25 PM
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Originally Posted by ragnakore View Post
If you are going for BEP (as shown with Back-in-Black's photo):
Get 4 x BEP 701 Switch. This is a simple ON-OFF switch. 1 switch for the House, 1 switch for Port Engine, 1 switch for Starboard Engine, and 1 switch for Paralleling of Start Batteries together.
Get 2 x BEP SKU:710-140A. This has same functionality of BlueSea 7610.
Buy the appropriate Labels for your BEP switches or you can just write it down with a Permanent Ink Marker.

Another thing I forgot to mention: BEP's devices are square. You can install them side-by-side (as shown with Back-in-Black's photo). The connections between are simple conductor plates and is hidden. Makes for a neater installation.

With BEP you can actually buy the "twins with house" setup already assembled as a unit. That's what I did. Or, you can customize it for your particular application and buy the modules you need.

My boat had 3 Perkos from the factory and it was just confusing as heck. For whatever reason, I was going thru batteries like crazy. Since I installed the BEP setup, it's really intuitive to operate and in those 6 years I've replaced the 2 starting batteries once. Still using the same 2 house batts.

The VSRs let you use a single output charger and charge both starting batts and the house too. Turn the parallel switch on and connect the charger to one of the start batts. When the start batts are fully charged, the VSRs will close and allow charging of the house batt(s).

The "parallel" switch in the standard BEP config allows you to parallel the two starting batteries but does not allow you to parallel the house batt(s) with the start batts. Never really bothered me enough to change it - figured if I needed to, I'd just move cables on batteries in an emergency. But you could add another "parallel" switch too.
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Old 01-26-2014, 06:07 PM
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This set-up was wired by the engine installer, (re-power) twin 2008, 225 ETECS.

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As you can see, battery positives are jumped from 1 to 1 and 2 to 2 on battery switches. I know this isn't a good set-up, but will it be a problem? I'm thinking starboard batt switch should be set to "1" and port batt switch should be set to "2"... or vise-versa. If they're both set to the same battery, will that be a problem, (over-charging)?

Great info, by the way.

Thanks.

Last edited by catch232; 01-27-2014 at 04:49 AM.
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Old 01-26-2014, 06:55 PM
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I have twins with 2 batteries on each. One is wired only for engine and the other is also wire engine but also with house. They are wired to an A, B A+B switch. I don't have shore power for re-charge and never had to really need it. I normally start A+B mode and let it charge both during running. I rarely turn off the engines once I leave port, 4-strokes really sip the fuel, so why mess with something that is working. On the time anchoring or long term drifts, I may turn off one of the two engines and switch it back to the house only side, preserving the engine battery. I also carry a set of jumper cables on the need to jump one set to the other, but I haven't needed them yet in the past 7 years with this setup. I do spilt the House electrics over Port and Starboard, base on power draw: VHF, sonar, etc.
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Old 05-06-2015, 05:20 AM
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Originally Posted by ragnakore View Post
The minimum practice is to have a separate battery for Engines, and a separate battery for House. The optimum/best is to have separate battery *per* engine and a separate battery for House. And depending on how much electronics in the boat, one might require/need more house batteries (connected in Parallel).
(Resurrecting an older thread here rather than starting a new one, as it's on-topic)

I have twin engines and independent batteries for each like the OP, plus two house batteries of the same make and production month connected in parallel. Would it be acceptable to put an ACR between one of the start batteries and the two parallel house batteries?
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