The Hull Truth - Boating and Fishing Forum - View Single Post - Length of battery time on the water?
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Old 10-16-2008, 11:11 AM
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Default RE: Length of battery time on the water?

If you know the approximate current draw of the electronics you are using while not moving, you can pick a deep cycle battery based off of its Amp hour rating. Basically if you determine you are going to be drawing about 15 amps of current for a period of 2 hours, you would need at least a battery with a rating of 30 Ah (amps x hours). There really isn't a way to determine how long a cranking battery will last that I know of... however I'm pulling around 100 amps off a single group 24 700 CCA battery and I park for 4-5 hours at a time and have yet to drain my battery.