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Old 03-18-2017, 04:25 AM   #1
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Default Coming off, going on - Shore Power

OK, the excitement continues to grow for the soon 'new to me' 4100 SCA (twin diesels and a generator) 'pick up' some time next week (paper work drills continue).

So the boat will be on shore power at the current owner's slip, and I'll be heading out for a short (hour/8 nm) trip up to the marina that will be the boat's new home.

Yell at me LOUD if my thought process/procedure is wrong. Beginning with AC power coming from shore power.

Ensure both battery switches are on.

Blowers on for four minutes, bring engines and generator up. Turn off all AC loads and OPEN their breakers on panel. OPEN shore power breaker at pedestal. Shore power breaker OFF on panel, generator breaker ON. Bring back AC loads that will be running underway. Disconnect both ends of shore power cable and stow on board. Underway, blowers off after cruising speed.

Preparing to moor, blowers on. After mooring, switch off AC loads, switch off unneeded DC loads. Shut down Engines. Hook up shore power cable. AC breaker CLOSED at pedestal. Check polarity indicator GREEN. Generator breaker OPEN on panel, Shut down generator. Panel Shore Power breaker ON, bring up AC loads for in port use.

With any luck I won't blow the whole place up
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Old 03-18-2017, 02:37 PM   #2
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I think you have it down but recommend to disconnect the shore power before turning on the genny just in case you accidentally left something on and do the reverse when connecting back up.
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Old 03-18-2017, 04:50 PM   #3
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I think you have it down but recommend to disconnect the shore power before turning on the genny just in case you accidentally left something on and do the reverse when connecting back up.
Thanks Mike, good catch.
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Old 03-18-2017, 11:34 PM   #4
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you got this buddy. By the way, i leave my blowers on all the time when running the engines and genny
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Old 03-18-2017, 11:37 PM   #5
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by the way Paul it never happened until you post pictures
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Old 03-19-2017, 05:12 PM   #6
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Originally Posted by PJHoffnet View Post
OK, the excitement continues to grow for the soon 'new to me' 4100 SCA (twin diesels and a generator) 'pick up' some time next week (paper work drills continue).

So the boat will be on shore power at the current owner's slip, and I'll be heading out for a short (hour/8 nm) trip up to the marina that will be the boat's new home.

Yell at me LOUD if my thought process/procedure is wrong. Beginning with AC power coming from shore power.

Ensure both battery switches are on.

Blowers on for four minutes, bring engines and generator up. Turn off all AC loads and OPEN their breakers on panel. OPEN shore power breaker at pedestal. Shore power breaker OFF on panel, generator breaker ON. Bring back AC loads that will be running underway. Disconnect both ends of shore power cable and stow on board. Underway, blowers off after cruising speed.

Preparing to moor, blowers on. After mooring, switch off AC loads, switch off unneeded DC loads. Shut down Engines. Hook up shore power cable. AC breaker CLOSED at pedestal. Check polarity indicator GREEN. Generator breaker OPEN on panel, Shut down generator. Panel Shore Power breaker ON, bring up AC loads for in port use.

With any luck I won't blow the whole place up
Wow! When you say it like that I think I need a nap. Happy motoring.
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Old 03-20-2017, 12:47 AM   #7
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Wow! When you say it like that I think I need a nap. Happy motoring.
Tax payers' money at work - 27+ years USN Submarine service. I'm that geekwho will have a pre-underway check list, fueling che list, potable waterm loading check list, etc. I feel a lot better (safer) depending on a proven procedure in my hand than my memory.
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Old 03-20-2017, 07:00 AM   #8
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One mechanic here claims you should always disconnect shore power before starting the engines due to the sudden overload from the alternators. Others say that is rubbish. Thoughts?
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Old 03-20-2017, 11:35 AM   #9
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One mechanic here claims you should always disconnect shore power before starting the engines due to the sudden overload from the alternators. Others say that is rubbish. Thoughts?

A boats starting and charging system are 12 VDC which is separate from shore power AC. However the battery charger is where the two can meet and IMO the charge should be turned off when starting to prevent the potential of high current being sourced from it by the starter which may result in damage to the charger. It should protect itself and limit the current draw but I would rather not put it to the test.
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Old 03-20-2017, 12:48 PM   #10
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1) Turn off all individual AC breakers
2) Turn off main AC breakers
3) Disconnect Shore power
4) Start Engines

Why would you need to start the generator? You're only moving the boat a short distance. DC items like fridge should be able to run off of the batteries and alternator.

In reverse order:

1) Stop the engines
2) Connect shore power
3) Turn on main AC breakers
4) Turn on individual AC breakers.
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