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Peter Kennedy has been in  business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and  do-it-yourself boat owners who wish to undertake this work themselves.

Peter Kennedy has been in  business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and  do-it-yourself boat owners who wish to undertake this work themselves.

How do I charge two battery banks on my boat and still keep them separate?

Posted by Liam Kennedy on 1/18/2019 to Batteries (Conventional)
The simplest way, if you can remember to do it, is to turn your battery switch to "BOTH" when charging, and turn it back to 1 or 2 when you are finished.  This solution is unsatisfactory for those who sometimes forget and then end up with a flat battery from time to time.

Should I hook up batteries in Parallel or keep them in separate banks?

Posted by Liam Kennedy on 1/18/2019 to Batteries (Conventional)
There may be some disadvantages to hooking up batteries in parallel but there are also considerable advantages. The main disadvantage as I see it is that as the batteries get old one will fail first, quite often by getting a shorted cell.

How big a battery bank do I need?

Posted by Liam Kennedy on 1/18/2019 to Batteries (Conventional)
For most people to answer to this is "as big as possible".  Charlie Wing's book the "Boatowners Illustrated handbook of Wiring"  has a very good explanation of how to calculate the capacity you need. The calculations start by working out what your daily load will be both at anchor and while underway.

Charger Settings for AGM Batteries

Posted by Peter Kennedy on 10/19/2017 to Battery Chargers
What are the recommended charge settings for AGM batteries.  We looked it up for you.............

What happens when I have multiple charge sources charging a single battery bank

Posted by Peter Kennedy on 5/2/2017 to Battery Chargers
What happens when I have multiple charge sources charging a single battery bank? I get this question asked almost every day. "I have a battery charger, an alternator, and solar panels charging the same battery. Does it get overcharged?" Here are some thoughts on the subject.....

How do you size a battery charger for a sailboat

Posted by Peter Kennedy on 4/3/2015 to Battery Chargers
What are the factors that go in to deciding how big a battery charger to install on a sailboat?

Battery layout for twin engine boats

Posted by Peter Kennedy on 10/16/2014 to Batteries (Conventional)
Battery layout for twin engine boats
There are many ways to do a battery layout for multi-engine boats, here is one simple layout using remote switches.

Help - my batteries are getting HOT!

Posted by Peter Kennedy on 1/24/2014 to Battery Chargers
Help!  My Batteries are getting hot!  What should I do?