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Low Battery Warning

Discussion of radars, GPS, autopilots, stereos and TV's. Also iPad and other mobile navigation devices.
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Topic author United States of America
Sadey
First Mate
First Mate
Posts: 149
Joined: September 16th, 2018, 6:56 am
Vessel Info: 2003 Carver 356 with 8.1 Mercs
Agradecida
Location: Racine Wisconsin
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Low Battery Warning

Postby Sadey » July 9th, 2019, 9:27 am

Quick ?, should my alternators charge my house battery? Almost all of my electronics on the bridge are powered by the house battery which is the largest AGM available and brand new. I have 2 12" MFDs, autopilot, radar, stereo with amp, VHF w/AIS and fridge all running while under way. Yesterday did a two hour cruise stopped for 3 hours with everything off but the fridge and radio on with no music playing. After about an into the hour cruise home with everything back on I received a low battery message on my MFD. I Fired up the genny and of course the charger kicked in at high amps for the initial charge and Agradecida was happy again.

By the way Fayette Michigan is a fantastic harbor and cool place to see. Brand new docks with power. Make sure to hit Sherry's Port bar. Its about a mile walk south past the cemetary for cheep beer. Not a culinary delight but nice walk and very friendly people.
Thank you for the help!

Dave & Trina

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United States of America
AaHubb
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Vessel Info: '99 404 CPMY
my twin diesel pusher
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Re: Low Battery Warning

Postby AaHubb » July 9th, 2019, 10:22 am

Do you have a battery selector switch? If as you say all of your instruments run off the house battery the selector switch may have been bypassed. If that is the case then your engines may not be charging your house battery. You may have to trace the wiring to get a better idea of your exact setup.

..Aaron
'99 404 CPMY
SeaDragon
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United States of America
Cooler
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Vessel Info: 1995 Carver 330 Mariner
Twin 350XL Crusaders
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Re: Low Battery Warning

Postby Cooler » July 9th, 2019, 10:29 am

Yes, Fayette is gorgeous. Years ago they had an annual Blessing of The Fleet ceremony and Lost Sailors ceremony. That inlet had numerous flower wreaths and floating bouquets. If you swing through Menominee on Thursday, I'll buy dinner. 8-) er
Cooler By The Lake
( All weather people have to say this on air, near lakes )
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Canada
Tireless
Scurvy Dog
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Posts: 38
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Vessel Info: 2006 Carver 44 CMY
Volvo Penta D6 370 HP
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Re: Low Battery Warning

Postby Tireless » July 9th, 2019, 11:04 am

Sadey, I had a 356 and I found something out the hard way. When you are on shore power it does not matter what your battery switch is set on, all of the batteries will charge as there is a charge wire that comes to your batteries. Probably three charging leads to your starters, house and penny batteries.

However, you will find that your battery switch, under the step, must be set to ALL or BOTH when underway for the alternators to charge ALL of your batteries, including your house battery. The alternators will only charge what the selector switch is set to when underway.

Hope this helps.

Tireless
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Topic author United States of America
Sadey
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First Mate
Posts: 149
Joined: September 16th, 2018, 6:56 am
Vessel Info: 2003 Carver 356 with 8.1 Mercs
Agradecida
Location: Racine Wisconsin
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Re: Low Battery Warning

Postby Sadey » July 9th, 2019, 11:23 am

Thank you all for the responses. The switch under my step is simply an on and off switch. Thoughts?
Thank you for the help!

Dave & Trina
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Canada
Tireless
Scurvy Dog
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Posts: 38
Joined: October 16th, 2018, 4:51 pm
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Volvo Penta D6 370 HP
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Re: Low Battery Warning

Postby Tireless » July 9th, 2019, 12:29 pm

That is clearly different than my 1999, 356. My current boat has on/off under the step as well. Beside that there are 2 breakers which are breakers for the charging systems. One of them controls the alternators ability to charge the batteries. Do you have those? If not, you may have a breaker inline that is stopping your alternators from charging. Bottom line is that your alternators should be charging your house for sure. Maybe someone can chime in that has a newer 356 than I that can help. Sorry I couldn't..
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Canada
Tireless
Scurvy Dog
Scurvy Dog
Posts: 38
Joined: October 16th, 2018, 4:51 pm
Vessel Info: 2006 Carver 44 CMY
Volvo Penta D6 370 HP
Location: Port Severn, Ontario
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Re: Low Battery Warning

Postby Tireless » July 9th, 2019, 12:57 pm

Sadey, I checked the Owners Manual for a 2004 Carver 356 and the diagram under the step of the panel shows the same as I had. The only time the selector switch is only an on/off switch is with diesels, not your case.

The selector switch was designed to enable you to select Bank # 1, Bank #2, BOTH or turn them OFF. Do you have another switch on your boat that would enable the Bank selections as described. There are also breakers beside the dial for the charging system.

In your boat, how are you selecting battery banks, that is where the problem may be. In my 356, I had Bank #1 for the starters and Bank # 2 as the house. Is it possible that someone changed the switch under the step to an on/off prior to you buying the boat. If so, this maybe the issue as you can't draw from Bank 1 and 2 individually. You would want to do this so you can keep a battery in reserve in case of emergency starting. A a stated before, the batteries must be set on both for the alternators to charge while underway.
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Canada
Midnightsun
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Re: Low Battery Warning

Postby Midnightsun » July 9th, 2019, 12:57 pm

If you cannot switch battery positions there is a relay or ACR or a combiner that automatically does the charge thing for you however it seems to not be doing its job.

My 2006 is set up the same with on/off switches for all the batteries with combiners that do the charge allocations.
Cheers, Hans
2007 Carver 41 CMY
Twin Volvo D6-370's
Montreal, Canada
Midnight Sun I Photos
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Topic author United States of America
Sadey
First Mate
First Mate
Posts: 149
Joined: September 16th, 2018, 6:56 am
Vessel Info: 2003 Carver 356 with 8.1 Mercs
Agradecida
Location: Racine Wisconsin
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Re: Low Battery Warning

Postby Sadey » July 9th, 2019, 3:08 pm

I have Horizon 8.1s. Each of the four batteries has it's own on/off only switch. Each of the staring batteries are wired only to it's respective power plant however the port motor/battery also powers the windless. I'll dig around and see if I can find a breaker for the house battery that may be tripped. After a day on the house only battery when I hook up to shore power the charger for the house battery shows a fair amount of amps for the initial charge then tappers off. Is it possible the engine driven alternator(s) don't put out enough charge in a low battery state to keep up with the draw of all the electronics?

Thanks again for the help/suggestions.
Thank you for the help!

Dave & Trina
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Canada
Tireless
Scurvy Dog
Scurvy Dog
Posts: 38
Joined: October 16th, 2018, 4:51 pm
Vessel Info: 2006 Carver 44 CMY
Volvo Penta D6 370 HP
Location: Port Severn, Ontario
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Re: Low Battery Warning

Postby Tireless » July 9th, 2019, 3:52 pm

No problem. Sorry I couldn't sort it out for you. Good Luck

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