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Author Topic: Battery charging setup  (Read 369 times)

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Steve_in_lex

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Battery charging setup
« on: December 27, 2021, 04:35:56 PM »

Please bear with me on this - I'm a rookie on the battery charging process.

I just returned from chartering a boat in the Caribbean, and in the briefing I was told that there was a battery dedicated to starting the engine and another "domestic" battery for everything else.  Okay, got it.

But then they said that the domestic battery only charges up when the engine is in neutral, buy it does not charge when the engine is in forward.  That's different from what I believe is the setup in my C-34, where both batteries charge when the engine is running, whether in neutral or forward (depending on the 1/2/Both switch).

What kind of setup would charge when the engine's in neutral, but not in forward?
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Steve Saudek
2005 C-34 MK II
#1701
"Brisa"

KWKloeber

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Re: Battery charging setup
« Reply #1 on: December 27, 2021, 05:03:21 PM »

What boat/what engine?
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
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LogoFreak

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Re: Battery charging setup
« Reply #2 on: December 27, 2021, 05:59:34 PM »

That makes 0 sense. As far as I know charging isn't dependant on wether you're engine is in gear or not. Unless maybe the engine in that particular boat was very undersized and it couldn't perform double duty (charging and propulsion), but that would be the equivalent of saying you can't use the A/C while driving in your car, only when your parked with engine revved up...

More info needed for sure.
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Antoni - Vancouver BC
1992 Catalina 34 Tall rig fin keel mk 1.5 “Polonaise”
Hull number 1179

Holger Dieske

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Re: Battery charging setup
« Reply #3 on: December 27, 2021, 11:21:51 PM »

yes, they told you nonsense. The alternator charges if it is properly wired when the engine revs. Which gear does not matter, it is decided in the transmission.

Holger
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I am from Germany and I use Google-Translator! (and a little bit my brian ;) )

C34 "RUNAWAY" Mark 1.5 - 1992 WK - Hull Nr. 1219 - Yanmar3GM30F - Flag: German - Boat stay in Mediterranean Sea.

Jim Hardesty

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Re: Battery charging setup
« Reply #4 on: December 28, 2021, 06:20:17 AM »

Quote
I was told that there was a battery dedicated to starting the engine and another "domestic" battery for everything else.  Okay, got it
But then they said that the domestic battery only charges up when the engine is in neutral, buy it does not charge when the engine is in forward.

It would be possible to design it to operate that way.  Don't know why it would be that way, can think of a few reasons not to.  Unless it had an auxiliary generator hooked up to run off the engine.   Better off not getting into it at the check-out, just do it their way and enjoy. 
Rest assured your Catalina wasn't designed that way.
Jim
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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

Steve_in_lex

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Re: Battery charging setup
« Reply #5 on: December 28, 2021, 08:43:56 AM »

Thanks, all, for your comments.  It didn't make sense to me either so I'm glad I'm not crazy. 

FWIW, the boat was a Jeanneau 41 and the engine was a replacement that looked close to brand new.  The guy who did the briefing was very knowledgeable in every way except (seemingly) the engine.  I'll write the Sunsail/Moorings base in Tortola to comment on the recommendation to run the engine in neutral for 90 minutes, morning and evening, which is a buzz kill when at anchor in a beautiful setting.
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Steve Saudek
2005 C-34 MK II
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Ron Hill

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Re: Battery charging setup
« Reply #6 on: December 29, 2021, 02:14:43 PM »

Steve : That only charging in neutral and not when the engine is in FWD or Reverse- does NOT compute!?!

My thought
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Robert Giroux

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Re: Battery charging setup
« Reply #7 on: December 30, 2021, 11:12:07 AM »

The Mooring's guy undoubtedly knows what he's talking about for his own boats. This is probably a dual-alternator design with a huge second alternator to charge a lithium system, which you wouldn't want killing your horsepower when you need to steam, so it has a relay that only allows it to run in neutral. The biggest pet peave I had when chartering was the crappy house banks that couldn't keep the fridges running even 18 hours... A constant headache. 
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JUNO - 2003 C34MKII - Hull #1637 - Universal M35B
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Noah

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Re: Battery charging setup
« Reply #8 on: December 30, 2021, 11:24:12 AM »

Juno—Maybe? But the “need to run it 90 minutes TWICE DAILY”  sounds suspicious for a large alternator feeding a lithium bank.
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Robert Giroux

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Re: Battery charging setup
« Reply #9 on: December 30, 2021, 12:49:43 PM »

Juno—Maybe? But the “need to run it 90 minutes TWICE DAILY”  sounds suspicious for a large alternator feeding a lithium bank.

Agreed, maybe large second alternator feeding crappy old batteries?  :shock:
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JUNO - 2003 C34MKII - Hull #1637 - Universal M35B
Coconut Grove, FL - IG: @sailing_juno

Steve_in_lex

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Re: Battery charging setup
« Reply #10 on: January 06, 2022, 10:19:06 AM »

Robert/Juno, it sounds like you're onto something.  At any rate, it's only relevant for a future charter.   

In the course of researching this, I looked through the C34 comments and articles and am thiinking that I'll replace our boat's A/B switch with an automatic charging relay.  Several different people, all relatives, use our boat, and we've had people drain the batteries by leaving the switch on Both for a week at the mooring.  Not good for family relations.

Looks like ACR's are pretty idiot-proof.
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Steve Saudek
2005 C-34 MK II
#1701
"Brisa"
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