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NPike

Posted 10/12/2018 3:57 PM (#920791 - in reply to #920752)
Subject: Re: Battery group size power

Posts: 612

2 points on batteries:

1) Example a size 31, Marine Deep Cycle Battery is used to power a trolling motor that draws 55 amps at max trust. The motor can then run for (108 ah / 55 Amps = time) ? 1.96 Hours. Before the battery drops below ~ 10.5 Vdc, which is generally considered the minimum voltage for trolling motor, lights, fish-finder, etc. For starting the voltage needs to be > 11,5 Vdc, but if recharged by gas motor the life cycle varies.

2) Marine Cranking AMPS (MCA)- equals the number of amps a battery can deliver at 32 degrees Fahrenheit for 30 seconds and maintain at least a voltage of 1.2 volts per cell (7.2 volts for a 12 Volt battery). This differs from cold cranking amps which are measured at 0 degrees Fahrenheit. This is the most useful spec when determine which battery to select.