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18-05-2019, 08:19
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#1
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Marine Service Provider
Join Date: Aug 2011
Location: St Augustine
Boat: '87 Irwin 43
Posts: 245
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Dead start battery...
Ok...you’ve sailed for many hours, with engine off, towards your next landfall...
Turning the start key to crank the diesel to enter the inlet you hear only click click click...your start battery is dead.
How do you get your diesel started in this scenario?
(Make up some reason why you MUST start your diesel...no wind, adverse current, no outside assist available, etc).
You have a dedicated (but dead) start battery separate from your house bank (which shows about 75% on your XYZ battery monitor).
How do YOU get your diesel started with a dead start battery? (Don’t even suggest hand cranking unless you’ve actually done it!)
Thanks
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18-05-2019, 09:49
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#2
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Registered User
Join Date: Apr 2005
Location: Southern California
Boat: Catalina 320
Posts: 1,314
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Re: Dead start battery...
I've got a Catalina, I just switch to #2 or both and start the engine, is this a trick question or just for French boats ?
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18-05-2019, 10:01
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#3
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Registered User
Join Date: Oct 2015
Posts: 2,007
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Re: Dead start battery...
My boat has a single (12V) start battery, and eight Group 31 batteries that make up the 24 volt house bank. There are NO connections between the two systems at all--switched or not.
The boat builder very thoughtfully supplied a pair of jumper cables that make it easy to start the engine using any one house batteries if needed. I needed once. Worked a treat.
Don't make it hard or complicated. On a modern boat with proper separate house and engine battery systems there should never be a cross connect switch that a fallible human (like me!) could leave in the wrong position.
The jumper cables are the perfect solution. Easy to implement if needed, cheap. Can't be left accidentally in the wrong position.
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18-05-2019, 14:56
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#4
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cruiser
Join Date: Jan 2017
Boat: Retired from CF
Posts: 13,317
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Re: Dead start battery...
Good ACRs like BSS ML model may accommodate a momentary "self jumpstart" button overriding the default isolation long enough to crank from House.
Can be up to 600A surge, which is why you would not that facility on the lighter duty cheap VSR / combiners.
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18-05-2019, 14:58
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#5
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Registered User
Join Date: May 2011
Location: San Diego CA
Boat: Liberty 458
Posts: 2,205
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Re: Dead start battery...
We have two start batteries, a portable jump start battery and 3 banks of carbon foam house batteries.
All our batteries are isolated and we have multiple charging sources. You need starting redundancy.
We can also start our main engine if the generator is running.
We also have a spare starter motor.
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19-05-2019, 07:11
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#6
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Marine Service Provider
Join Date: Aug 2011
Location: St Augustine
Boat: '87 Irwin 43
Posts: 245
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Re: Dead start battery...
Quote:
Originally Posted by Calif.Ted
I've got a Catalina, I just switch to #2 or both and start the engine, is this a trick question or just for French boats ?
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No...not a “trick question”... curious how others plan for, equip, setup and wire for this situation (doesn’t matter if they’re French or not).
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19-05-2019, 07:33
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#7
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Registered User
Join Date: May 2005
Location: Long Beach, CA
Posts: 863
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Re: Dead start battery...
Malyea, he say:
Quote:
How do YOU get your diesel started…
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So we're each answering for his particular circumstance, and not getting into "the perfect set up." (Just watch it drift into theoretical pontification).
I have a switch that connects the house bank to the starter battery, normally left open, but exists to address this very scenario. If I close it, the two banks equalize. Hopefully my house bank, in that situation, has a high enough state of charge to boost the start battery and turn over the engine.
If the house bank can't help the starter, I leave the switch closed (I know the start battery takes its charge echo-style from the house bank, and it's technically unnecessary to leave the switch closed, but it might save some time and I can't see how it could hurt anything), stand off, and haul out the Honda e2000. The Honda powers a 50a charger, which charges the now-combined bank. I carry a shore power cable. The Honda is my normal charging source when lying to anchor.
The Hondas are pretty reliable, so I'm probably okay, but I've been thinking about carrying a power pack to sleep better.
__________________
s/y Elizabeth— Catalina 34 MkII
"Man must have just enough faith in himself to have adventures, and just enough doubt of himself to enjoy them." — G. K. Chesterfield
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19-05-2019, 16:40
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#8
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Marine Service Provider
Join Date: Aug 2011
Location: St Augustine
Boat: '87 Irwin 43
Posts: 245
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Re: Dead start battery...
Quote:
Originally Posted by Starbuck
Malyea, he say:
So we're each answering for his particular circumstance, and not getting into "the perfect set up." (Just watch it drift into theoretical pontification).
I have a switch that connects the house bank to the starter battery, normally left open, but exists to address this very scenario.
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What switch do you have?
(No pontification from the OP...just asking what others do in the scenario I outlined.)
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19-05-2019, 16:49
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#9
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Registered User
Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 9,705
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Re: Dead start battery...
However you chose to switch it, i.e., a 1-2-B or three switches, a reliable electrical system should allow you to use EITHER the start or house bank to start the engine without having to either connect the two banks together or to use jumper cables.
The only time battery banks should be connected is when charging is present, whether this is manually through switching or with a VSR.
This "high technology" has been available for over two decades.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, SR/FK, M25, Rocna 10 (22#) (NZ model)
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20-05-2019, 19:43
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#10
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Registered User
Join Date: Dec 2012
Posts: 651
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Re: Dead start battery...
I would just sail in to dock or anchorage and sort it later. Not the answer for your scenario.
Batteries low just a click.
Switch to other battery. I have a 1 2 both switch. The I only sail with #1 is my engine battery I keep in reserve. #2 is my house battery and I ussualy start with it. So I sail on no 2 on line with #1 isolated JIK.
When this doesn’t work.
Manual actually recommends ussing both to start.
Next methods requires a helpful friend due to my arms not being long enough.
Open compression levers. With no compression, turn key to start. Battery may still spin engine. When up to speed close compression lever engine will often start.
Option three hand start. Can’t on my boat not fitted with hand start.
Other boats I have sailed have had hand cranks and I have used them and they did work.
Or back to just sail to a safe location I can sort it later.
Or if you have a fixed pitch prop and are sailing fast enough try bump starting. I have a folding prop so this won’t work on my boat.
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21-05-2019, 05:09
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#11
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: ‘01 Catana 401
Posts: 9,626
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Re: Dead start battery...
I toggle a momentary switch engaging the ACR that is able to handle the short duration inrush for the starter. Easy as pie
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21-05-2019, 05:44
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#12
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Registered User
Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,961
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Re: Dead start battery...
In the same manner as noted by some, above, we have a "momentary switch" on our engine panel that activates a solenoid that connects our house bank (450 AH) to our start battery. I had it installed when we first got the boat and have used it once when our start battery gave up the ghost while we were on a cruise. Works well (although we also carry extra long jumper cables, just in case!)
FWIW...
__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
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21-05-2019, 08:27
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#13
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Marine Service Provider
Join Date: Aug 2011
Location: St Augustine
Boat: '87 Irwin 43
Posts: 245
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Re: Dead start battery...
All good points...
Those who have a “momentary switch” - what make and model has worked well for you?
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21-05-2019, 09:04
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#14
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: ‘01 Catana 401
Posts: 9,626
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Re: Dead start battery...
Quote:
Originally Posted by malyea
All good points...
Those who have a “momentary switch” - what make and model has worked well for you?
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We’re using a blue seas momentary toggle switch to actuate a cyrix CT ACR.
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21-05-2019, 10:48
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#15
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cruiser
Join Date: Jan 2017
Boat: Retired from CF
Posts: 13,317
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Re: Dead start battery...
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