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Charging 12V house batteries underway
- Trixboat
- Scurvy Dog
- Posts: 7
- Joined: May 14th, 2018, 4:10 pm
- Vessel Info: 2005 560 Voyager
- Location: Phoenix AZ
Charging 12V house batteries underway
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!
Volvo D12 675 HP
- A Lee
- Scurvy Dog
- Posts: 25
- Joined: April 1st, 2018, 9:53 am
- Vessel Info: 2005 56' Voyger
- Location: Mississippi
- Been thanked: 3 times
Re: Charging 12V house batteries underway
- Trixboat
- Scurvy Dog
- Posts: 7
- Joined: May 14th, 2018, 4:10 pm
- Vessel Info: 2005 560 Voyager
- Location: Phoenix AZ
Re: Charging 12V house batteries underway
Volvo D12 675 HP
- Trixboat
- Scurvy Dog
- Posts: 7
- Joined: May 14th, 2018, 4:10 pm
- Vessel Info: 2005 560 Voyager
- Location: Phoenix AZ
Re: Charging 12V house batteries underway
Progress on fixing rear bildge pump float switch and replacing owner's state room shower pump. Yay!
Volvo D12 675 HP
- Icango560
- Scurvy Dog
- Posts: 29
- Joined: June 4th, 2020, 8:38 am
- Vessel Info: 2004 Carver Voyager 560, 675 Volvo’s.
- Location: Guntersville, AL
- Has thanked: 5 times
- Been thanked: 1 time
Re: Charging 12V house batteries underway
- km1125
- Admiral
- Posts: 3356
- Joined: February 28th, 2017, 6:04 pm
- Has thanked: 60 times
- Been thanked: 976 times
Re: Charging 12V house batteries underway
Trixboat wrote:Source of the post 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!
Sounds like you got the issue figured out, but to follow up on the second part of your post in case others might be interested.
What you're referring to is a "DC-to-DC charger", not a transformer. There are several available and can have different input voltages and different output voltages. You can get a 24V to 12V one and they also have provisions to shut off if the input drops to a specified amount (so that you never drain down the source if it's not being recharged).
- V One
- Scurvy Dog
- Posts: 2
- Joined: June 30th, 2013, 8:18 pm
- Vessel Info: 2005 560 Voyager
- Been thanked: 1 time
Re: Charging 12V house batteries underway
- brow_14
- Scurvy Dog
- Posts: 2
- Joined: March 13th, 2022, 3:12 pm
- Vessel Info: 2005 Carver Marine 36
- Location: Los Gatos, CA
Re: Charging 12V house batteries underway
I apologize in advance if this question was already answered, but I am relatively new to the Carver world and would like to get some advice on a couple of topics (I have a 2005 Carver Marine 36)
1) - When I'm at the dock connected to shore power, obviously all of the electrical systems work, however, when I disconnect the shore power, all of the electrical (12v system etc) will turn off and the dead battery alarm will go off and will not come back on until I start the engines...But if I turn off of the engines (with no shore power), the 12v system will shut off again. .....As an example, if I am out on the water, drop the anchor, turn off the engines, I will not have access to the radio etc...I realize the generator is an option, but I figured the 12v system would run off the battery when the engines are not running, or is the generator the only option? What are your thoughts?
2) - when connected to shore power at the dock, is it necessary to have the compressor come on from time to time or is there a way to turn it off at night?....it can be loud in the middle of the night.
Thank you in advance for helping me out.
- km1125
- Admiral
- Posts: 3356
- Joined: February 28th, 2017, 6:04 pm
- Has thanked: 60 times
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Re: Charging 12V house batteries underway
Sounds like you might have a bad house battery. If the engine(s) start just fine, then those batteries might be OK, but with the engines running or the shore power available, there is power getting to your house battery which would supply power to all those electric systems. I would check the house battery. It's possible there are just corroded connections to it, or it may be dry (if a conventional lead-acid battery), but I would bet you'll end up replacing it. Any idea how old it is?
for #2, which compressor are you talking about... the HVAC? Are you sure it's a compressor you're hearing? Do you have vacu-flush systems? Do you have actual air horns or electric "air" horns? (the real "air" horns also use a compressor)
- brow_14
- Scurvy Dog
- Posts: 2
- Joined: March 13th, 2022, 3:12 pm
- Vessel Info: 2005 Carver Marine 36
- Location: Los Gatos, CA
Re: Charging 12V house batteries underway
- I don't know how old the batteries are, I just bought the boat and had a mechanic inspection and survey done with no reported issues on the batteries (doesn't mean they didn't catch it)..., but I will check the house battery- Thank you!
is that to say that the house battery will be charged by the shore power as well?....or does the house battery get charged by the generator?
- to answer your question on the compressor, I believe it is the horn compressor ...can that we switched off (at night)?
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