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Charging 12V house batteries underway

Discussion of batteries, chargers, wiring, generators, distribution panels, battery switches, etc.
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Topic author United States of America
Trixboat
Scurvy Dog
Scurvy Dog
Posts: 4
Joined: May 14th, 2018, 4:10 pm
Vessel Info: 2005 560 Voyager
Location: Phoenix AZ

Charging 12V house batteries underway

Postby Trixboat » May 14th, 2018, 5:08 pm

Still trying to fully understand DC electrical system on new to us 560 Voyager.
It's my understanding that the 12V house batteries are not charged by the 24V engine electrical system. Thus, we must run the generator to charge house batteries while at sea. This to avoid deep discharge of house batteries from inverter run fridge and freezer. Do I have this right?
It seems like we could install a 24V to 12V transformer (some online retailers call it a converter) so the house batteries are charged when underway. The transformer would need to be disconnected when we are at rest (no shore power). Maybe there are transformers that are smart enough to disconnect when 24V system not getting charged.
TIA for your thoughts and advice!
2005 560 Skylounge
Volvo D12 675 HP

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United States of America
A Lee
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Joined: April 1st, 2018, 9:53 am
Vessel Info: 2005 56' Voyger
Location: Mississippi
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Re: Charging 12V house batteries underway

Postby A Lee » May 17th, 2018, 8:52 am

Unless there has been a modification to your system, the port engine has 2 alternators and is responsible for charging the house batteries while running. I have the same boat/year and that is the way my is designed.
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Topic author United States of America
Trixboat
Scurvy Dog
Scurvy Dog
Posts: 4
Joined: May 14th, 2018, 4:10 pm
Vessel Info: 2005 560 Voyager
Location: Phoenix AZ

Re: Charging 12V house batteries underway

Postby Trixboat » May 19th, 2018, 2:54 pm

Thanks for heads up on port engine. I'll investigate. Also have a mechanic coming this week, so I'll get his advice.
2005 560 Skylounge
Volvo D12 675 HP
User avatar

Topic author United States of America
Trixboat
Scurvy Dog
Scurvy Dog
Posts: 4
Joined: May 14th, 2018, 4:10 pm
Vessel Info: 2005 560 Voyager
Location: Phoenix AZ

Re: Charging 12V house batteries underway

Postby Trixboat » May 21st, 2018, 11:40 pm

A Lee -- you are, of course, right that port engine has 12V alternator for house batteries. The survey mechanic threw us on track telling us house had to be charged by genny under way, which made NO sense.
Progress on fixing rear bildge pump float switch and replacing owner's state room shower pump. Yay!
2005 560 Skylounge
Volvo D12 675 HP

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