battery bank switch


Old 04-05-12, 12:46 PM
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Join Date: Dec 2011
Location: USA
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battery bank switch

I have a Blue Sea dual battery bank switch,red in color, that has a 1 2 Both on it.
Its for switching multiple battery banks on and off. Some boats have one and solar people use them too sometimes just for a disconnect.
My question is what wire goes on the common terminal??? Does the neg wire go there???
Please elaborate for 1 battery bank and 2 battey banks ..thanks
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Old 04-05-12, 02:10 PM
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In almost all cases only the positive wire is switched. The negative wire from battery bank one, battery bank two and the load are all connected together. The positive wire from each battery bank goes to the appropriate terminal on the switch and the "common" terminal goes to the load positive connection.

Definitely DO NOT connect the battery negative wire to the "common" terminal as it will create a "bolted short circuit" from the battery positive terminal through the switch to the battery negative terminal. This could cause the battery to explode!
Old 04-05-12, 05:44 PM
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Join Date: Dec 2011
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if you had 2 banks and used them for starting... both banks red wires would get broken between
common and 1 and common and 2 so there would be 2 red wires on the common stud...
Old 04-05-12, 06:08 PM
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I guess not its the load that comes off the common..
Old 04-05-12, 06:24 PM
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Smile The terminology is a bit off.

A battery bank consists of a group of two or more batteries.
Each battery within a bank is just referred to as a battery.

Are you installing this switch and bank in a boat?
Old 04-06-12, 05:37 AM
Join Date: Apr 2007
Location: Near Buffalo, NY
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Connect Battery 1 to Switch 1. Connect Battery 2 to Switch 2. Connect the starter (and house feed, if any) to the third terminal.

Rather than two starting batteries, it's more common to install a starting battery on one side and a deep-cycle RV/Marine battery on the other. You run the engine for an hour or so to charge the starting battery, then switch to the "house bank" for the rest of the trip and when the engine is not running. Switch back to start the engine.

A battery "bank" is two or more batteries in parallel (red to red; black to black). Batteries in a bank should be purchased at the same time with the same date codes. If you put a failing old battery with a new one, the old one will cause the new one to overcharge, reducing its use life.

Also, there are battery isolators that keep your house bank charged when the engine is running, but prevent the starting battery from discharging when the engine isn't running. It's a lot more convenient than manually switching all the time.

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