Comments on: Marine Battery Group Size Explained [Chart] https://www.tacklescout.com/marine-battery-group-size/ Seek out the Best in Fishing Tue, 22 Dec 2020 14:21:09 +0000 hourly 1 https://wordpress.org/?v=7.1.4 By: Tackle Scout https://www.tacklescout.com/marine-battery-group-size/#comment-347 Thu, 20 Aug 2020 12:18:39 +0000 https://www.tacklescout.com/?p=2654#comment-347 In reply to Joey.

I’ve always heard to go by the RC of the battery. The RC is minutes of constant current delivery of 25 amps at 80°F, without falling below 10.5 volts. For example, the Optima D31M has an RC of 155 min. If your boat has a total amp draw of 5.0 amps, divide 25 by 5 and multiply by 155 for a total of 775 minutes (12.9 hours) of continuous run time. If your boat has an alternator charging the battery, that run time will increase. That calculation may not be perfect, but it is an easy way to estimate.

]]> By: Joey https://www.tacklescout.com/marine-battery-group-size/#comment-342 Fri, 14 Aug 2020 13:52:12 +0000 https://www.tacklescout.com/?p=2654#comment-342 Great information
Would like to know a calculation for how long a battery could last on a draw from fish finder and trolling motor. Fish finder should be easier due to consumption should be consistent
Trolling motor variable
If you have Ideas?
Please advise
Thanks again

]]> By: Tackle Scout https://www.tacklescout.com/marine-battery-group-size/#comment-336 Wed, 05 Aug 2020 15:15:53 +0000 https://www.tacklescout.com/?p=2654#comment-336 In reply to James W. Morris.

I found a JC-29-HM on Sears.com It says 200 minute reserve.

]]> By: James W. Morris https://www.tacklescout.com/marine-battery-group-size/#comment-326 Wed, 22 Jul 2020 01:08:38 +0000 https://www.tacklescout.com/?p=2654#comment-326 I have a diehard deep cycle 29HM battery with 840 cold cranking amps and 210 amp reserve, This is not on your chart so you may not know. To set a multi-meter I need to know the Amp rating of this battery, 840, 210, or something totally different?

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