So do you need to run on both batteries to keep them charge by switching from one battery to another .or is one a crank battery and one a deep charge for the cabin:smt013
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When the motor is running you should have the switch in the "both" position. Once you park and turn off the motor move the switch to one of the batteries to ensure that you have juice in one of them to start the motor to go home. It is suggested to not switch from one battery to the other while the motor is running.
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I am lazy and often forgetful. I have dual batteries and always have my switch on 1 or 2, never Both. I alternate this between 1 and 2 about once per month.
My theory: when in my slip, I am always charging both batteries via shore power. When running, I am only charging one battery and that battery will be used as house when anchored (no switching required). If there are any issues starting the boat, I can switch to the other battery which is charged from shore power (I typically only anchor one night, maybe two at the most). Up until this point, I've had no issues. To be honest, I don't want to forget about switching from Dual every time I cut the engine, I will be paranoid about running down both batteries.
Suggestions for the lazy and forgetful are most welcome!
So do you need to run on both batteries to keep them charge by switching from one battery to another .or is one a crank battery and one a deep charge for the cabin:smt013