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

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

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.
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How big a battery bank do I need?

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.
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Charger Settings for AGM Batteries

What are the recommended charge settings for AGM batteries.  We looked it up for you.............
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What happens when I have multiple charge sources charging a single battery bank

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.....
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How do you size a battery charger for a sailboat

What are the factors that go in to deciding how big a battery charger to install on a sailboat?
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Battery layout for twin engine boats

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.
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Help - my batteries are getting HOT!

Help!  My Batteries are getting hot!  What should I do?
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