Re: Which battery would you buy?

Posted by Texasmark1 on January 15, 2017 at 19:00:45 from (184.21.30.47):

In Reply to: Which battery would you buy? posted by Geo-TH,In on January 15, 2017 at 15:45:29:

This may help. Marine deep cycle batteries used to be made with thick plates to tolerate numerous deep cycles and not fracture, which assists in long life under heavy pounding applications. Problem is for a given size battery if you fatten the plates you have to reduce the count so the total surface area is reduced and so is the max current supplied for a certain time at a certain voltage.

In today's market they have done things, probably added fiberglass mesh spacers between plates to support them so that you can get away with more thin plates and get the cranking amps back up and have the deep cycle element too....which you don't need for your application..

This may help: http://www.autobatteries.com/en-us/how-to-choose-your-car-battery-replacement/battery-applications. Problem I have is the voltage of 7.2 volts as starting terminal voltage used as the metric for the CCA test. I don't know about you but I don't have any starters that will wind up at 7.2v (at the starter)...maybe one would slowly continue if started above 10v but not start off.

In your case for the marine you would have available 750 amps at 7.2 volts min for 30 seconds. Not sure of the slope of the discharge cycle of a lead acid battery but assuming it is a linear function let's play with some numbers:

You want 250A max for 30 seconds and let's assume an average voltage (12.75 - 7.2)/2 for a voltage of about 10v. 250A is ⅓ of the 150 CCA rating. 10v at the battery terminals with the motor running as the voltage drops with the battery supplying ⅓ of the specified capacity should do nicely. Considering a linear voltage drop and only using ⅓ of the "fresh battery" rating your battery terminal voltage wouldn't even drop to 10v.

There are curves on deep cycle batteries as to how far down and how many times the battery will tolerate the deep cycling. The shorter the discharges and immediate recharges, the less effect the cycling has on battery life....per the charts I have seen. I would consider a MAX of ⅓ capacity as a mild discharge, especially with the immediate recharge.

The marine posts both and has a good warranty; the truck lacks in posted reserve minutes and warranty. I'd go with the marine.

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