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Old 26-10-2015, 14:24   #1
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Compromised Electrical system? Help Please

Hello all
We have just returned to our 40ft motor boat in the Bahamas and was told power was restored on the dock however when we plugged in our 50 amp splitter to two 30 amp shore it blew the cord. WE then heard the stern thrusters trying to start and noticed the 12v battery had melted the positive side and the Dometic battery charger appears to have been damaged.
We are trying to get an experienced marine electrician to fly in to access boat damage. but would like any input as to what might have gone wrong?
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Old 26-10-2015, 14:42   #2
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Re: Compromised Electrical system? Help Please

Greetings and welcome aboard the CF, ladyhaggis.
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Old 26-10-2015, 16:43   #3
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Re: Compromised Electrical system? Help Please

I might suggest that you contact your insurance carrier, they may be able to investigate the cause, or at least recommend someone.

Best of luck and hope your damage is minimal.

Paul


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Old 26-10-2015, 17:24   #4
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Re: Compromised Electrical system? Help Please

Where in the Bahamas, I am an ABYC Certified Master Technician, and SAMS AMS. I will be crossing from Biscayne Bay Wed. to Bimini and then onto Berrys. I may be able to help.

Scott
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Old 26-10-2015, 17:37   #5
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Re: Compromised Electrical system? Help Please

Where in the Bahamas. I know someone who was in Nassau and was told the dock power was 110 when in fact it was 220 and severely damaged his electrical system.
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Old 26-10-2015, 18:04   #6
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Re: Compromised Electrical system? Help Please

A friend told me not to plug in in Nassau. He'd checked the voltage (supposedly 110) and it was way too high. I'd lost an inverter/charger in Nassau the year before, now I know why.
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Old 27-10-2015, 07:52   #7
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Re: Compromised Electrical system? Help Please

we have and waiting
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Old 27-10-2015, 07:52   #8
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Re: Compromised Electrical system? Help Please

George Town Exuma
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Old 27-10-2015, 09:45   #9
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Re: Compromised Electrical system? Help Please

What amazes me is businesses can destroy expensive items on boats and tell you to get lost after they do it.

I had fuel delivered from a place called Lewis Oil in Palatka/Gainesville on the day my boat launched. Brand new, unused engines, brand new, unused fuel system.

Was supposed to be a happy day. Instead, the mixture of gasoline, water and off road diesel they delivered destroyed the high pressure pumps in both engines.

It cost me about $4000 to fix and in an extra haul out.

Will they own up to the damages they caused? Of course not, so I have to take them to small claims court.

It's sad this place can't own up to the electrical problems and fix whatever they broke on the op's boat. I find the more distance between my boat and "marine professionals", the better everything works. Well, except the tech that fixed my engines (to keep them under warranty). He was great.
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Old 27-10-2015, 10:36   #10
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Re: Compromised Electrical system? Help Please

if one of the 30a plugs was wired in reverse pol. you'd end up with a dead short if you pluged a Y in. this should trip the dock breakers. but if they were bad would instead melt your Y cable


but I do not know why DC things would be effected on the boat. maybe the AC ground wire was hot on the dock.


if you still have access to the 2 plugs you used I would check them or have them checked (by a 3rd party, not marina) at least it will provide some info. check for polarity, voltage, and freq


do you have a main triple pole breaker on the boat or only a double?
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Old 27-10-2015, 10:41   #11
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Re: Compromised Electrical system? Help Please

Quote:
Originally Posted by ladyhaggis View Post
...when we plugged in our 50 amp splitter to two 30 amp shore it blew the cord...
Before plugging in a splitter it is SOP to check the voltage and phasing on both lines.
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Old 27-10-2015, 10:43   #12
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Re: Compromised Electrical system? Help Please

the hubbel has lights on it and does this for you. the Marinco one is just a dumb Y
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Old 27-10-2015, 11:00   #13
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Re: Compromised Electrical system? Help Please

[QUO .TE=ladyhaggis;1947463]George Town Exuma[/QUOTE]

I was at the Georgetown yacht Club the summer before last and the voltage on the dark was 274 volts when I checked it. My battery charger inverter does not work the same sInce
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Old 27-10-2015, 11:02   #14
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Re: Compromised Electrical system? Help Please

Lightning strike?
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Old 27-10-2015, 11:40   #15
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Re: Compromised Electrical system? Help Please

It appears that on initial plug in only one leg was working, this is what showed up on my panel. I then tried another nearby pedestal
and then nothing worked, not even one leg, took the cord apart and saw the burn marks……I have tested the main 50amp shore
cord and it is OK. I am getting another Reverse Y adaptor sent in and I am getting a third party electrician to check out the pedestal before another hook up. I am also going too get him to check out the integrity of the boat system if he can.
I do not think that the main boat system is compromised however I am concerned about a strange situation with the 12volt house battery ( 8D, sealed lead acid). It was being charged automatic by a Sentry charger through the 110 system. I think it may have blown the charger but not sure of that. Also my stern thruster ( off same battery) started activating all on its own and I noticed that the negative terminal on this battery was melting off, I disconnected the thruster and put on a new terminal . I also disconnected the charger. the 12 v system appears to be operating fine again, ( I guess until the battery runs down ) but why would the thruster do this to the battery, and could the internal neg. connection inside the battery be compromised as well. This was happening without any shore power or generator power…….
Appreciate your thoughts and opinion……..
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