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House battery gets low

Old 04-03-2015, 02:08 PM
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Default House battery gets low

I'm having an issue with my house battery. About 10 months ago I had my center console rewired and added an "add a battery" switch. Shortly thereafter my house battery took a dump, The batteries were old so I went ahead and replaced both the start and house with Optima blue tops (single engine yamaha F225). I've never had an issue with the start battery, but the house seems to have an issue maintaining a charge. After a day or two of using the boat under normal conditions (usually run for a bit then troll or drift) I'll start to get low voltage alarms from my electronics and my lights will be very dim. I took the battery to autozone and had it tested and the battery is not bad. I'm not running a ton of electronics (usually a garmin 740s, fusion ra205, VHF and maybe an led spreader). Just to see if it worked, while having the low voltage alarm on the garmin and VHF I switched the add a battery to "combine" and didn't have any problems. This is getting very frustrating as I never had any issues when running a simple perko 1/2/both switch. Any suggestions?
thanks
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Old 04-03-2015, 02:45 PM
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None of those items I would associate with a large current draw.
I really like Optima. A group 34, if that's what you have, is shorter and lighter and has limited storage as compared to a standard but larger group 24.
If you have a voltage sensing relay then it sounds like it is not closing when it should. It could be defective (but unlikely), or you could have a wiring issue, like a loss of ground. Or, a depleted battery combined with a continued draw could alter the relay behavior. Once combined, if the voltage immediately sags, then it can open again, and repeat this cycle leaving you with no charge. I'm not familiar with the Yamaha motor but if you have a small stator versus a larger alternator, it may not be able to lift and hold the voltage under certain conditions. Thus, the relay bounces open.
In many cases, having an ACR/VSR increases your dependency on AC shore charging.
You really need to take a few voltage measurements at key times.
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Old 04-03-2015, 03:38 PM
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Originally Posted by Alexlikestacos View Post
I'm having an issue with my house battery. About 10 months ago I had my center console rewired and added an "add a battery" switch. Shortly thereafter my house battery took a dump, The batteries were old so I went ahead and replaced both the start and house with Optima blue tops (single engine yamaha F225). I've never had an issue with the start battery, but the house seems to have an issue maintaining a charge.
It sounds like your house battery is not being charged. You said you added an Add-a-Battery switch, but you didn't mention an ACR.

Did you also install the ACR that goes with the Add-a-Battery kit? If you did, is the ACR connected to the positive terminals of the batteries, and does it have a fused connection to ground (for voltage reference)?
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Old 04-03-2015, 04:26 PM
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The ACR is installed as per the instructions.

David Analog, at what points would you suggest taking voltage measurements?
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Old 04-03-2015, 06:17 PM
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The ARC is only going to charge the secondary battery after the main battery is charged.
Check the voltage on the secondary battery with the motor running. The voltage should be above 13v if the battery is being charged.

Your Yamaha motor should have an isolated secondary charge lead for a secondary battery.
I think the one on my F150 is a 10A secondary charge lead.
Connecting that to your house battery will allow both batteries to be charged while the motor is running without relying on the ARC to switch over and charge the house.

If you are running bait pumps all day this will have keep the house battery charged.

Also check to see what the threshold voltage is set at for your low voltage alarm on your electronics.

Check to see what kind of voltage drop you get on the house battery with the motor off and all the electronics and pumps are on.
Maybe you have some bad wiring some place.
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Old 04-03-2015, 06:27 PM
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Originally Posted by Alexlikestacos View Post
The ACR is installed as per the instructions.
Which ACR do you have? The smaller one or the larger one?
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Old 04-04-2015, 12:46 PM
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Do you have attached the negative cable between both battery negative terminals or at least have both battery negatives cabled directly to the same common ground point on the engine , and all contacts are clean (not just externally) and tight?
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