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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 01-07-2008
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Good post. Thank you.
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Old 01-07-2008
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ArtByJody is correct
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Old 01-07-2008
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I believe ArtByJody is correct, but I always disconnect shore power or ac charger first. Just a habit.
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Hey stuffit "Get a life"
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Old 01-08-2008
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What do you guys do when you have solar, wind, shore and alternator power available? - Disconnect all but one source?

The boat should be wired to accept any combination of input without damage, which includes the inverter being automatically switched out when shore power comes on.
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Old 01-08-2008
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There should be no problems with running both shore power and the engine if things are working correctly. The boat in the original post probably had a defective regulator in the engine charging circuit.
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Old 01-08-2008
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Correctly wired, it shouldn't matter. Blocking diodes are supposed to prevent any problems - automobile chargers used by people trying to save a buck might blow their systems, but not a properly installed marine grade system. - ArtbyJody writes it up much better than I can - what I can add is hands on.

Summertimes when working on the boat pierside I run the A/C on shore power(after all, why not be comfy) - and the engine at the same time.
I'd hate to have to disconnect my solar panel to run the engine - don't you think that would be a little odd?
I plug a small generator right into my shore power outlet to fire up my 110 only a/c, while underway on the motor, it's two separate systems made separate by folks with electrical engineering creds
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Old 01-13-2008
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I must be missing something here

I must be missing something here. Just because you are connected to shore
power it doesn't mean your AC battery charger is on. Isn't the charger on a breaker switch. You only turn it on periodical.

I find its bad practice to leave your AC charger. It would hide a possible weak battery.
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Old 01-13-2008
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[quote=chuck711;249660]I must be missing something here. Just because you are connected to shore
power it doesn't mean your AC battery charger is on. Isn't the charger on a breaker switch. You only turn it on periodical.


Your right - it doesn't mean that is on - but it probably should be. As you will most likely weaken your battery by not doing so as they have self-discharge rates (plus what happens if you leave a light on or the bilge pumps cycles through a few times and you are gone for a few weeks). Having a trickle charger on them will keep them at optimum charged capacity.
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Old 01-13-2008
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I tend to unplug the "yard shore power" when I'm off the boat, because these days I'm down there every two or three days...or more if work allows.

My other boat is loaned to a woman skipper who lives about 60 miles north of here, so I encouraged her to take that boat's batteries to her house and to keep them trickle-charged on occasion.
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Old 01-13-2008
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Agree there should not be any problem running alternator a battery charger at the same time. If something bad happens, probably a result of a fault that already existed and they should be happy it happened at the dock!
About chargers: Anyone using a cheap auto charger should stop immediately. Those things are not ignition protected, and they may contribute significantly to galvanic corrosion, and worst case may cause stray voltage to enter the water via DC ground and hurt possibly kill someone. This is due to the fact that they may not use an isolation type transformer. So there are 3 reasons why using a cheap automotive charger may screw up someone else's boat, and I know there are a bunch of you doing it!!! arrrggg.

So.. trickle charging good or bad?? I have always left my 10amp double bank guest charger on at the dock, never noticed any significant loss of water from the batts. Going 2 years now and I haven't noticed any loss of capacity.
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