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Old 09-27-2013
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Re: How big of a starting battery do I really need?

Consider that the 15 hp engine you use is a 'marinized' garden tractor engine. Like MS says above, a U1 will do it.
Google this : 15 hp diesel engine starting battery
it will take you to a link (too long to post) that is for marine starting battery calculations.
Bottom line - 15 hp - 420 CCA is sufficient to start you 6 times with no charging per The Marine Electrical and Electronics Bible
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