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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 04-09-2007
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Starting battery

What would be an adequate dedicated starting battery for a 50 hp diesel?

It appears that my battery switch has a cranking rating of 600 amps. I assume that limits me to no larger than a group 24 flooded?
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Old 04-09-2007
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One of the books, maybe Don Casey or Nigel Calder's had a rough formula, based on the HP of the engine.... I'll see if I can find it.
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Old 04-09-2007
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Alden68, a link to an informative page on batteries and comments on estimated requirements for typical marine diesel engines....See section 7.2 paragraph 2 for sugesstions on your question....

Car and Deep Cycle Battery Frequently Asked Questions (FAQ) Section 7

Last edited by Whampoa; 04-09-2007 at 10:58 PM.
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Old 04-09-2007
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Whampoa:

Interesting text, thanks. However the text states that a 4 cylinder diesel requires 700-800 CCA yet the CCA caculator estimates 214 CCA based on 107 CID and 4 cylinders???
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Old 04-09-2007
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Well just think of that as one of the paradoxes to be resolved! No charge.....

What does your engine manual recommend for your specific diesel? I didn't see what make and model you have in your boat. That might help folks like Sailingdog and others render you with a better answer.

Last edited by Whampoa; 04-10-2007 at 01:11 AM.
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Old 04-09-2007
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It is a 40 year old Perkins 4-107. I only have a workshop manual written in Old English that contains a very descriptive essay on removing the head and examining valve tolerances. No info on electrical components/requirements unfortunately.
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Alden-

THe reason the CCA calculator could be underestimating it is that it may be designed for gasoline engines, which have lower compression ratios and need less power to start.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

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Old 04-10-2007
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Alden68 - Reading on down in paragraph 3 of section 7.2 Excerpted here:

According to BCI (Battery Council International), diesel engines require 220% to 300% more current than their gasoline counterparts and winter starting requires 140% to 170% more current than during summer

As SD suggests it may be that the CCA estimator was written for gasoline engines but we have no info to help us know for sure...

I assume you have already searched for 4-107 info on the web.
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Old 04-10-2007
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Once you figure out how much your starter is going to draw make sure the battery is constructed to supply max amps on demand.
some batts are better suited to cranking than deep cycles.
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  #10  
Old 04-10-2007
Whampoa
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Alden68 - I don't think the rating on your battery switch is the limiting factor for start battery size/capacity. Why do you believe that is constraint?

SD does that make any sense to you?
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