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Old 07-11-2016, 05:19 PM   #21
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Like others here, we do not use the AC when leaving the boat during the week. We do run a small dehumidifier, which has worked great in terms of keeping the boat dry and avoiding any musty odors.
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Old 07-11-2016, 05:29 PM   #22
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I liveaboard on the Mississippi north of St. Louis most of the year. I turn the AC off anytime I'am away from the boat. The units are large enough that 1 will cool the boat pretty quickly in the covered slip when I return.
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Old 07-11-2016, 06:09 PM   #23
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When we are gone we use a dehumidifier from Lowes on a timer.
Well, I never thought of using a timer for the dehumidifier!! Duh. I hate to run one all the time, because the electric rates at my marina are exorbitant, but a timer would be perfect. Thanks for the idea.
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Old 07-11-2016, 06:18 PM   #24
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Dehumidifiers and things like electric space heaters are made pretty well. But please, Always check the outlet and plug, they tend to heat up, GFCI can and should trip, but don't assume they will
If a boat is at a marina the assumption is someone is making at least a walk by of the boats, but again I 'd not assume.
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Old 07-11-2016, 07:16 PM   #25
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you can wire a humidistat in parallel with the thermostat,thus only turning on when the humidity levels reach the set point.Humidistats don't care what the temperature is.That would cut your ac bill tremendousely.You can have days that are 90 degrees,but the humidity level is low,hence the ac wouldn't run.This prevents the odor,and mildew issue,without the expense,or the run time on the compressors.
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Old 07-11-2016, 08:17 PM   #26
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I use a Peltier Effect dehumidifier that is about the size of a loaf of bread. It drops the humidity low enough that mildew doesn't grow. It uses very little power. I sit it next to the galley sink and run a drain hose into the sink drain.
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Old 07-11-2016, 11:13 PM   #27
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I felt like you for many years. However, this past 4th while I took a quick siesta, I was awaken by breakers, AC units going off and on in rapid fashion with reverse polarity red lights blinking on the AC panel! Cutting off everything AC I eventually found a very overheated (to the point of melting) power cord plug that's attached to the boat. Lost a tv, charger and a few other items fried. If I was not onboard know telling what could have happened. So now I'm a Denise convert with new power cord, better connections and leave only my charger and refrig circuit on.
So, are you ever going to sleep on your boat again while connected to shore power? If you have rectified the cause of the problem and still fear it's reoccurrence, how could you ever feel safe sleeping on your boat again?

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Old 07-11-2016, 11:22 PM   #28
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So, are you ever going to sleep on your boat again while connected to shore power? If you have rectified the cause of the problem and still fear it's reoccurrence, how could you ever feel safe sleeping on your boat again?

Ted
I'd add to your question, did you have a professional marine electrician come examine your boat after the incident and make sure everything was in compliance? I know I'd sure have had to do that to sleep comfortably.
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Old 07-12-2016, 11:55 AM   #29
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I'd add to your question, did you have a professional marine electrician come examine your boat after the incident and make sure everything was in compliance? I know I'd sure have had to do that to sleep comfortably.
Great question. After finding the shore power cord shot on one end, I disconnected from shore power completely on both ends. With everything turned off I started the genny. All showed fine on the panel with correct voltage to both AC circuits. I started adding loads one by one to the genny with the 2 a/c being last. All was normal and I let everything run on genny power for over 4hours. During this time I ran to WM and purchased a brand new 50ft/50amp power cord. I'm ditching the old one; not repairing.

We slept on board for the next 2 days with no issues. Of course I selpt on the couch next to the breaker panel during that time. I checked on those connections many times during those days...cool as can be. I feel confident the very old cord had bad terminals causing the failure.
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Old 07-12-2016, 01:06 PM   #30
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Great question. After finding the shore power cord shot on one end, I disconnected from shore power completely on both ends. With everything turned off I started the genny. All showed fine on the panel with correct voltage to both AC circuits. I started adding loads one by one to the genny with the 2 a/c being last. All was normal and I let everything run on genny power for over 4hours. During this time I ran to WM and purchased a brand new 50ft/50amp power cord. I'm ditching the old one; not repairing.

We slept on board for the next 2 days with no issues. Of course I selpt on the couch next to the breaker panel during that time. I checked on those connections many times during those days...cool as can be. I feel confident the very old cord had bad terminals causing the failure.
I thought it was a good question and your answer was "No, I did not." I don't see electricity as an area to be left entirely to DIY. Not in a house. Not on a boat. Odds are great you won't have a recurrence of problems, but then you didn't expect the first problem. I'd engage a professional even if all I did was pay him a couple of hours to tell me everything is great and I did just what he would have done. I know it could seem like a waste of money, just my view. I respect if you choose to ignore my advice but feel compelled to say it.
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Old 07-12-2016, 01:19 PM   #31
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I leave my AC's off and leave the dehum set at 55% relative humidity. One nice thing about the dehum is in daytime heat, that by itself reduces RH even though the water content in a mass basis remains the same. So dehum usually does nothing in mid day but cycle on and check RH. When it cools down in the evening temps drop and RH goes up, the thing wakes up and does it's thing. And with cooler temps it's refrigeration machinery is happier.

High mid day temps seems to not bother anything in the boat, except for the fridge but I usually empty it and turn it off if gone for more than few days.

Win win.
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Old 07-12-2016, 01:51 PM   #32
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I'd add to your question, did you have a professional marine electrician come examine your boat after the incident and make sure everything was in compliance? I know I'd sure have had to do that to sleep comfortably.
A few weeks ago the uniesse in the slip next ours had some sort of short in their power cord on the dock. They weren't there (we were t either) but another neighbor heard a pop and then saw smoke. He ran over there and flipped the breaker at the pole off and unplugged it. Their cord is hardwired to the boat.
It didn't do any damage to the boat. They had an electrician come and check everything out and install a new power cord.
That was the first I'd heard of a cord being hard wired to a boat. Apparently there's a barrel down below that the cord winds down into when unplugged from shore power.
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Old 07-12-2016, 04:50 PM   #33
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Those are Glendinning Cablemasters. A wonderful item to have especially with 50 amp service.
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Old 07-12-2016, 04:51 PM   #34
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Originally Posted by ragin cajun View Post
Great question. After finding the shore power cord shot on one end, I disconnected from shore power completely on both ends. With everything turned off I started the genny. All showed fine on the panel with correct voltage to both AC circuits. I started adding loads one by one to the genny with the 2 a/c being last. All was normal and I let everything run on genny power for over 4hours. During this time I ran to WM and purchased a brand new 50ft/50amp power cord. I'm ditching the old one; not repairing.

We slept on board for the next 2 days with no issues. Of course I selpt on the couch next to the breaker panel during that time. I checked on those connections many times during those days...cool as can be. I feel confident the very old cord had bad terminals causing the failure.
Hope you haven't thrown that old cord away, the terminals are easy to replace.
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Old 07-12-2016, 05:01 PM   #35
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Hope you haven't thrown that old cord away, the terminals are easy to replace.
Thought about changing the terminals but I just don't want to have anything to do with that cord (over 20 years old). I have little faith in the integrity of it. New feels so much better
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Old 07-12-2016, 05:07 PM   #36
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When it cools down in the evening temps drop and RH goes up, the thing wakes up and does it's thing. And with cooler temps it's refrigeration machinery is happier.

High mid day temps seems to not bother anything in the boat, except for the fridge but I usually empty it and turn it off if gone for more than few days.

Win win.
That's the big difference between NC and South Florida or Texas in the summer. The high today in NC was higher than in South Florida. However, the low tonight will be 70 degrees in Charlotte, NC, and 82 degrees in Fort Lauderdale. Our next week in Ohio is highs in the 80's and lows in the 60's.
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Old 07-12-2016, 05:41 PM   #37
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Hope you haven't thrown that old cord away, the terminals are easy to replace.
Had similar problems with an old 50A Marinco cord. Stripped back the insulation looking to find un-corroded copper in order to install new connectors; no luck after removing over 3' on either end. Moisture either wicked up from the ends or the insulation became permeable over time or both. Not worth the risk and replaced the entire cord.
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Old 07-12-2016, 06:04 PM   #38
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Moisture wicks up copper cable like mad. If you cut it back and it is black from corrosion, sh!tcan it. I got a 50' cord donated to me and conductors had gotten damp. Decided to make it into a 25'. That corrosion was EVERYWHERE. It must have wicked the entire length. Into the recycle...
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Old 07-13-2016, 05:36 AM   #39
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Ragin Cajun,
As the power cord receptacle (female) was bad at the boat (I assume from heat), what did the boat mounted plug look like? What did the back of the plug look like? (Where the boat wiring hooks to)
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Old 07-13-2016, 06:15 AM   #40
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Moisture wicks up copper cable like mad. If you cut it back and it is black from corrosion, sh!tcan it. I got a 50' cord donated to me and conductors had gotten damp. Decided to make it into a 25'. That corrosion was EVERYWHERE. It must have wicked the entire length. Into the recycle...
But it was worth taking the time to have a look, wasn't it?
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