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Author Topic:   Battery Switch vs Battery Isolator
Kelly posted 08-09-2005 05:25 PM ET (US)   Profile for Kelly   Send Email to Kelly  
If you have a battery isolator, do you need a battery switch, except maybe an on/off switch for electronics and other things that might drain the battery? Also, if you have a battery isolator, can you have a deep cycle and starting battery connected to the same isolator? Is the isolator able to use the starting battery for starting, or does it just use which ever battery has the greatest charge? Is the isolator kind of like a smart automatic battery switch?


jimh posted 08-09-2005 08:14 PM ET (US)     Profile for jimh  Send Email to jimh     
Battery isolator is a term usually applied to a device which tries to keep one battery from discharging another when they are connected in parallel to a source of charging current.

In most small boat installations the source of charging current is also the same conductor or lead that supplies battery current to the starter. In larger boats the charging current is often separated from the starter current and supplied on its own lead or wire or conductor.

The typical installation in a small boat uses the battery isolator to parallel two batteries so that they can be charged simultaneously while at the same time keeping them separated as source of current to various loads on the boat such as the starting motor.

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