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Old 11-28-2014, 01:27 PM   #11
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Um, you're right... Uhh, lets just ignore my previous post. Shouldn't be posting while on a turkey hangover!
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Old 11-28-2014, 01:28 PM   #12
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Quote:
Originally Posted by shrew View Post
Keep I mind that even when plugged into shore power, shore power doesn't run any 12V. That comes through the batteries. 12v draws from battery and charger replaces amp draw back into batteries again. So this means, lights, pressure water pump, electric flush and vacu-flush toilets, etc.
You are correct. If the batteries are not that low than running off them when charging should not be and issue if not to much load on the system, I.e. To many lights and stuff. However if the the load is high or the batteries are rather low than the charger will be stressed.
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Old 12-11-2014, 10:52 AM   #13
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Thought of another excuse for leaving my batteries turned on. Mercathode system!
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Old 12-11-2014, 11:36 AM   #14
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Incidentally, after re-reading the OP's post I suspect we are not referring to the battery charger, but rather charging batteries via the alternator while the battery is running. It is not uncommon for folks to attempt to recharge both batteries by setting the battery switch selector to BOTH. Technically, if you're using a dual battery setup (assuming single engine) properly, then one battery is dedicated as the Starter and the other dedicated as the House. Theiry being you could always switch to House to start the boat if the starting battery was dead. I wouldn't advise robbing from the starter to feed the house or using BOTH while on anchor.

It is not suggested to run the engine with the battery switch set to BOTH.
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Old 12-11-2014, 11:50 AM   #15
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Shrew if he is attempting to charge both from the alternator how would he be determining they are drawing 80% of it's output as he stated in the initial post?
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Old 12-11-2014, 02:25 PM   #16
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On my boat when the engine is running both batteries are charged when the switch is in the #1 position. If in the #2 position only the house battery is charging.
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Old 12-12-2014, 12:45 PM   #17
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Shrew if he is attempting to charge both from the alternator how would he be determining they are drawing 80% of it's output as he stated in the initial post?
I must have overlooked that detail. Battery charger is connected to the battery switch and not directly to the batteries?
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Old 12-12-2014, 04:20 PM   #18
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I must have overlooked that detail. Battery charger is connected to the battery switch and not directly to the batteries?
Oh well the OP has not come back since his initial post on 11/27 so I guess there is no sense continuing guessing what he meant.
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