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      The future of the JD Forum   07/31/18

      Thank you all for your participation on the JD Forums.  We have enjoyed answering your questions, providing project advice and technical assistance on this forum for a number of years. We believe that there are now better ways to provide this service for our customers and the community. With that in mind, we have made the difficult decision to discontinue the Jamestown Distributors Forum.   Our JD Tech Team is committed to being your trusted technical resource, and we encourage you to reach out via email, phone, social, product reviews, and to post questions using the Q & A 'Ask A Question' function on all product pages. Additional information can also be found on product page Technical Data Sheets (including detailed usage instructions and application data).   Thank You Jamestown Distributors 
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Battery Charger Size

2 posts in this topic

That will depend on the amp hour rating of the battery you are charging, on average choose 20% of the battery Amp hours for example a 100 ah battery would be a 20 amp charger.  The higher the amp charger the quicker it will charge a battery, however fast charging a battery can limit battery life.  A slow charge is best and 20% of amp hour rating seems to be a safe rate of charge.


 The general rule of thumb is C/5, or 
Capacity (in amp-hours) divided by 5. So an 80-amp charger is the 
right size for a 400Ah battery bank (400/5=80). When rounding is 
necessary, always round down because your battery bank will 
degrade over time and your C/5 rule will eventually meet.
Here is a good reference for battery charging:

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