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Old    Alex (alex_hunter)      Join Date: Oct 2009       06-14-2013, 8:33 AM Reply   
I've read minimum of 10% of total battery ah should be the charger amp output. I have 420ah total, so can I get away with a 40a charger or should I grab a 50??
Old    Earmark Marine (david_e_m)      Join Date: Jul 2008       06-14-2013, 12:14 PM Reply   
Quote:
Originally Posted by alex_hunter View Post
I've read minimum of 10% of total battery ah should be the charger amp output. I have 420ah total, so can I get away with a 40a charger or should I grab a 50??
You also have to factor in usage and how deeply you are cycling the batteries. If your charger is mostly working in a maintenance capacity then you have more than enough with a 40 amp charger or perhaps even less. If you are routinely discharging to 11.8 volts for example you could go as high as a 50 amp charger but certainly no higher. Also, factor in how much of that A/H capacity is your starting battery, if that is sometimes paralleled with the stereo bank and partially depleted.

David
Earmark Marine
Old    Alex (alex_hunter)      Join Date: Oct 2009       06-14-2013, 1:21 PM Reply   
Thanks a lot.

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