How to Use a Boat Battery Switch

The familiar 1-BOTH-2-OFF battery switch can still do its job, but modern charging systems and mismatched battery banks make the wrong turn costly. Here’s how to understand your boat’s setup—and avoid flattened batteries or a damaged alternator.

By
Tim Labute
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Published:
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Blue Sea Systems e-Series Selector Battery Switch

This little red switch was invented for a much simpler boat than most of us own today. Fifty years ago, a boat might have two ordinary lead-acid batteries, a modest alternator on the diesel or Atomic Four gas engine, a few incandescent lights, perhaps even a refrigeration system, but no solar panels or a secondary way to charge the batteries. Certainly, they wouldn’t have lithium banks or automatic charging relays (ACR).

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Tim Labute
Tim Labute
Tim Labute got his start sailing on the Great Lakes racing keel boats, moving up to longer trips through the Erie Canal, East coast, and Caribbean. Tim’s adventures spawned a YouTube channel called Lady K Sailing helping other people get started in the sport. Tim current sails a Hughes 35, a Laser, and teaches people to sail in his CL-14. Tim has come on as the Chief Editor of Practical Sailor.

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