BSS Add-A-Battery ACR and wiring questions

emilime75

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Jun 23, 2009
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Hey, all. I'll be adding a BSS 7650 kit which is comprised of their 5511E switch and 7610 SI-ACR. There are several ways to wire this up, and the most common is to connect the alternator output to the starting battery side...however, there are instances where this is not ideal and my questions are mostly about what would be the best for our use case - we mostly cruise around some, until we find a good cove to anchor up and then hang out for a while. After a couple of hours we may move elsewhere, but there is a good bit of floating with the engine off throughout the day. While anchored, the main current draw will be a stereo system at mild/modest volume, but it does contain 2 amplifiers.

With that, the house bank would deplete more than the starting bank, and to prevent the ACR from continuously cycling in this case, it would be best to connect the alternator output to the house bank, so while we are cruising and jumping from cove to cove, that bank gets recharged as much as it can. Once it is charged, the ACR will combine both banks and also charge the starting bank.

I'll add that this is not a large boat, just a 185 bow rider, and by bank, it's just a single battery each, although I may add a 2nd to the house. The starting battery has a 135RC, while the current house battery is rated at 182RC.

In addition, the boat is kept in a slip at a marina and I'll be adding a shore charger to it. I'm thinking that for this, a single bank charger will suffice, and I would also connect it to the house bank and it would act the same as the alternator when the engine is running. My unclarity here is what happens when I dock the boat and flip the switch from on, to off - would this disconnect the ACR and not charge the starting battery.
 

alldodge

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Mar 8, 2009
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In general connecting the ALT to the start bat will be sufficient to change both.

For house bats which get used a lot, it might be best to connect the ALT to the house bat. This way once motor starts the ALT provides full charge capacity to house and ACR will connect the start once level is up.

Now that said, I'm not sure I would do it with a EFI motor

https://marinehowto.com/automatic-charging-relays/
 

emilime75

Petty Officer 1st Class
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Jun 23, 2009
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204
Thanks for the reply. The article you linked, and the YT video they have demonstrating it, is exactly what brought me here and thinking that connecting the alt to the house bank is what I need to do. If you go down, just before about half way, they start talking about the ACR cycling when the house bank is larger than the starting bank, and/or it is severly depleted. That section of the article is titled "Correctly wiring an ACR on a cruising boat".
 

alldodge

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Agree, but note they are talking about a Cruiser with several house bats, similar to a house boat

You have an 18 footer and only one house correct?
 

emilime75

Petty Officer 1st Class
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Jun 23, 2009
Messages
204
That is correct, 1 house battery, which does have a larger reserve capacity than the starting battery and I am considering adding a 2nd.
 
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