Edd,
Marek, Dennis, and Joe are correct. We're talking SMALL engines here, and
the actual cranking amps required are modest.
Joe's A4 starts on an old motorcycle/garden tractor battery with 100 amps or
so of current.
Dennis' 25HP Universal has a max 190 amps, but probably actually draws less
than that.
My 36HP Universal draws about 100A in normal starting, but the installation
manual calls for starting cables and fuses sized for a max of 175A in case
something is not "normal". (see my earlier response to your question about
doubling the CCA. I point out that a Yanmar 3YM30 starter draws only 90A
with a fully charged 12V battery, but might go to 200A or so with a very low
battery or a locked up engine.)
I use a group 24 deep cycle battery to start my engine (I want as much
reserve capacity as possible). The MCA is in the mid-300 range, and the AH
rating is in the low 70s at the 20 hour rate.
BTW, the CCA rating at 0 degrees F is about half what a new battery will
deliver at standard temperature of 77F. The MCA (at 32F) is about 60 or 65%
of what the battery will produce in a warmer environment.
I think the clearest battery recommendations are contained in the Beta
Marine engine installation manual. Here is what they recommend:
2 & 3 cyl. Engines up to 25HP 35-50AH battery (@ 20
hr. rate) 350-400 MCA Current draw 100-120 amps used to size cables
4 cyl. Engines 25-38 HP 65-70AH
450-540 MCA Current draw 120 amps
4 cyl. Engines 43-70 HP 100-120AH
580-670 MCA Current Draw 120-170 amps
So for a starting battery ask yourself a couple of questions:
Do I really want to carry around the extra size and weight and cost of a
group 31 diesel start battery with 700-900 CCA? Could I use a smaller start
battery and benefit from some added capacity to the house bank instead?
When is the last time I actually tried to start the boat at 0F? Shouldn't I
be choosing based on MCA instead?
Given the increased vulnerability of an automotive or marine starting
battery to vibration and shock (vs. that of a deep cycle type battery), just
how long will the starting battery last?
Why have a battery with 900CCA if my starter cable is fused at 200A? And
how quickly will a fire start if I don't have a fused cable and the battery
delivers 900 or more amps while trying to start a locked-up engine?
Rick Brass
Washington, NC
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Marek
Dziedzic via CnC-List
Sent: Monday, April 30, 2018 6:10 PM
To: cnc-list@cnc-list.com
Cc: Marek Dziedzic <dziedzi...@hotmail.com>
Subject: Re: Stus-List Battery CCA Rating for a "Cold" Diesel Engine
No question, a bigger battery would work. But I would think that for just
starting, you really need a much smaller battery. These engines are small.
Tractors using these engines have 450 CCA batteries. If they work there,
they should work on the boat. I would save the weight for the house.
Marek
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
10
_____
From: CnC-List <cnc-list-boun...@cnc-list.com
<mailto:cnc-list-boun...@cnc-list.com> > on behalf of svrebeccaleah via
CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> >
Sent: Monday, April 30, 2018 4:51:06 PM
To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
Cc: svrebeccaleah
Subject: Re: Stus-List Battery CCA Rating for a "Cold" Diesel Engine
Edd, I would go with nothing less than 750 cca, space permitting. The more
the better. The bigger battery will last longer. I am using a group 27 to
start my Yanmar 4jhe44. I took out a 20 year old group 31 that was still
working.
Doug Mountjoy
Rebecca Leah
LF39
Port Orchard YC, WA.
-------- Original message --------
From: Edd Schillay via CnC-List <cnc-list@cnc-list.com
<mailto:cnc-list@cnc-list.com> >
Date: 4/30/18 13:23 (GMT-08:00)
To: Edd Schillay via CnC-List <cnc-list@cnc-list.com>
Cc: Edd Schillay <e...@schillay.com <mailto:e...@schillay.com> >
Subject: Stus-List Battery CCA Rating for a "Cold" Diesel Engine
Listers,
What would you recommend to be a good CCA rating for a starting battery to
warm up glow plugs and start a "cold" 35HP diesel engine?
All the best,
Edd
Edd M. Schillay
Starship Enterprise
C&C 37+ | Sail No: NCC-1701-B
City Island, NY
Starship Enterprise's Captain's Log
<https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fenterprise
b.blogspot.com%2F&data=02%7C01%7C%7C773b7fa182b343e3ec2c08d5aedc3a4d%7C84df9
e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636607183243121620&sdata=L7%2FuXToZ7Zy
ErYIIgvw2dlqmrWgkUITzctTyjV8OD8c%3D&reserved=0>
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
