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Old 08-19-2014, 03:04 PM   #1
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Great Loop Electrical Hook Ups

In planning stage for Great Loop (Fall 2015 departure). Have 50 amp service on our new to us boat, a 2006 Grand Banks 47. I assume some of the AC equipment on my boat run on 220-240 volt and some on 110-120 volt? Or does 220 come into the boat only to be dropped to 110 for all service?
The reason I ask:
I plan to get a smart "Y" adapter (2 30 amp male to one 50 amp female) but my understanding is you need two 30 amp from same service to make it work. That's all fine if there are two available.
Let's say I get to a dock where only one 30 amp 110-120 volt service is available. If I had a single 30 amp male to 50 amp female pigtail, could I just power the 110-120 volt stuff?
What do experienced cruisers carry for hook ups?
Thanks.
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Old 08-19-2014, 05:58 PM   #2
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not sure how you boat is wired...so can't answer if you have a true 250 panel....maybe a GB type can answer or over on the GB forum.

there are 30 to 50 125/250 adapters that will power both legs of the 50...but you'll really have to watch your usage.

I'm upgrading to a 50 125/250 and have both types of adapters
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Old 08-19-2014, 06:17 PM   #3
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Pretty much ever GBs I've seen that have 50a service have 125/250 50a. Other than some old ones that by now I'm guessing have converted as you don't really see 125 50a service at marinas anymore.

Having a couple of adapters will be handy. But figure on running your Genset from time to time. Because even with adapters the voltage once you put a load on it can drop low enough that you are not going to want to use it anyway.

It used to be in some of the out of the way places you need a drier plug style 50a adapter. But I haven't seen that in quite a while. Maybe others can say.
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Old 08-19-2014, 06:26 PM   #4
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This is a deal to get a yellow lined tablet, write down questions and get a knowledgable For hire person to come aboard. If these questions are being fielded here then I would suggest there are a lot more to be dealt with. Really, no disrespect, I found that the coin I spent was a good investment.
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Old 08-19-2014, 06:31 PM   #5
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Quote:
Originally Posted by sum escape View Post
In planning stage for Great Loop (Fall 2015 departure). Have 50 amp service on our new to us boat, a 2006 Grand Banks 47. I assume some of the AC equipment on my boat run on 220-240 volt and some on 110-120 volt? Or does 220 come into the boat only to be dropped to 110 for all service?
The reason I ask:
I plan to get a smart "Y" adapter (2 30 amp male to one 50 amp female) but my understanding is you need two 30 amp from same service to make it work. That's all fine if there are two available.
Let's say I get to a dock where only one 30 amp 110-120 volt service is available. If I had a single 30 amp male to 50 amp female pigtail, could I just power the 110-120 volt stuff?
What do experienced cruisers carry for hook ups?
Thanks.
The reality is that that all boats with 50A 125/250V service have 2 legs of 110 come into the boat. Unless your interior panel SAYS 250..then you might just have 2 busses of 125V like this panel...but again...it's possible that you could have either and without a pic or someone who knows eyeballing it...we are at a standstill....
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Old 08-19-2014, 07:10 PM   #6
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As Psneed indicated, most likely you have 2 busses of 110 and no 220 appliances. However, when I tried to run off just one buss before hauling out, my AC water pump wouldn't run. There are 3 AC units on my boat, 2 on 1 buss, one on the other. They are all raw water cooled by the same pump. There is an electronic box that takes power from any of the 3 AC units and turns the pump on. It won't turn the pump on with only 1 buss powered and there aren't any 220 breakers on my panel. Will figure it out before I leave the yard. My point is things aren't always as simple as you would think.

BTW, with 220 50 amp converter boxes, the shore power needs to be 2 legs on different phases, not the same phase.

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Old 08-19-2014, 07:43 PM   #7
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Sound like your pump gets it's power off the other leg of 125 along with that other A/C unit. Unless they are really large capacity units you should be able to power all three off one leg. That is the way my GB and most others are set up.
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Old 08-19-2014, 07:59 PM   #8
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Thanks all. I'll do some more checking and documenting of systems. Appreciate all the tips.
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Old 08-19-2014, 10:09 PM   #9
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Tom, assuming you boat is set up like mine, which it probably is, you Air Con and hot water heater are 240V, and everything else is 120V split up between the two "halves" that make up 240V.

I think you are on the right track getting a Reverse-Y adapter. In addition, I highly recommend getting two 30A, 50' cords to use with it. We used ours a lot and found that the two 30A outlets you want are seldom close to each other. To get the Reverse-Y connected to the outlets, you need the 30A extension cords. Fortunately, they are relatively inexpensive at <$100 each.

A 30A to 50A 120/240V adapter can work, but you will not have Air Con or hot water. I never used one. If we couldn't get 240V directly or through the reverse-y, then we just ran the generator.

By the way, in Canada you will find 50A outlets are non-existant anywhere other than the major city marinas (Kingston, Montreal, Quebec). Pretty much everywhere else is 30A.
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Old 08-19-2014, 10:36 PM   #10
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Tom, assuming you boat is set up like mine, which it probably is, you Air Con and hot water heater are 240V, and everything else is 120V split up between the two "halves" that make up 240V.
Very unlikely on a GB. Stock set up is to split the incoming 240v 50a to 2 legs of 120v. 1 for the A/C and 1 for "house" items like the water heater, charger, outlets, etc.
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Old 08-20-2014, 07:19 AM   #11
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240 volt appliances will have double pole breakers. 120 volt appliances will have single pole breakers. Look at the electrical panel and you will know what's on your boat (assuming that you know the difference).

Or, check the label on appliances you suspect might be 240 volt like the range, water heater and airconditioner.
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Old 08-20-2014, 07:37 AM   #12
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Most boats I have seen with true 220V and not just 2 - 110 legs have a separate panel for 220 appliances.

The types of breakers used may have one or two levers on them and could just be the 2 pole master for a 110 panel (poles connected breaking hot/neutral) or they could be 220 with a single or double throw (connected) with both hots to each terminal (again most of the time a separate panel).
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Old 08-20-2014, 08:05 AM   #13
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Our 50-amp service is split into two 125V legs as in Scott's first pic. No 220V appliances, all 100V.

The Smart Y works fine, when you can find two 30A connections out of phase with each other. (The idea of 30A extension cords is great.)

I know we can power one leg of our service with a simple 30A-to-50A adapter pigtail. I know which leg it powers (happens to be the one with the battery charger and oven/microwave). That seems to be arbitrary; no "leg selectors" available.

I'll mention that our aircon compressors/air handlers are each on a separate AC leg, so theoretically we could work ONE... but... the water pump is on the "leg not powered" by a single 30A input. Similarly, our 110V water heater and 110V range are also on the "leg not powered."

FWIW, an inverter somewhere in there could be an alternative to running the genset at a dock. (We don't have one.)

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Old 08-20-2014, 09:33 AM   #14
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Very unlikely on a GB. Stock set up is to split the incoming 240v 50a to 2 legs of 120v. 1 for the A/C and 1 for "house" items like the water heater, charger, outlets, etc.
I think we are miss-understanding each other. The GB 47's do indeed use 240V for the HVAC and for the hot water heater. These are 240V appliances. The AC service is also split into two separate 120V legs with 120V loads more or less balanced between them. It's just like a north american house.
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Old 08-20-2014, 09:56 AM   #15
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I think we are miss-understanding each other. The GB 47's do indeed use 240V for the HVAC and for the hot water heater. These are 240V appliances. The AC service is also split into two separate 120V legs with 120V loads more or less balanced between them. It's just like a north american house.

No we where not misunderstanding each other. I was just misunderstanding that this boat was one of the newer GBs. . My bad.

I've never looked at their electrical set up. So it may very well have both 240 and 120 items on board.
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Old 08-20-2014, 10:15 AM   #16
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No we where not misunderstanding each other. I was just misunderstanding that this boat was one of the newer GBs. . My bad.

I've never looked at their electrical set up. So it may very well have both 240 and 120 items on board.
Now I understand the that the misunderstanding was an understanding - or something like that....

The OP and I have the same model and vintage GB, though separated by 2 years I think. What I described is how my boat is set up, and hence very likely his too. But we have already found at least one equipment setup difference between the two boats, so it's certainly possible there are more.
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Old 08-20-2014, 11:12 AM   #17
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Sum Escape
Going back to your original questions. On a 47 Grand Banks the likely 220/240 volt appliances would be an electric range and an electric clothes dryer. These can also be 110v or in the case of the range, propane. This is important to know because you will not get 220 volts from shore power everywhere on the loop.

What I suggest you have in terms of adapters is:

Smart Y for two 30amp shore power posts
30 amp from shore power to 50 amp adapter, this would end up 110v
15 amp from shore power to 30 amp adapter
There are locations on the loop where only 15 amp is available, it is better than nothing and will allow you to charge the batteries
30 amp 50ft shore power cord, allows you to attach smart Y to two different posts.
If your budget allows a second 50 amp shore power cord, you may have to go 100 feet for power is some locations.
50 or 100ft long 14 gauge household extension cord, again 15 amps is better than nothing and you don't want to drag 50 amp cables around when you can use a lighter weight 14 gauge extension cord.

In the 2/3rds of the loop I did, I used all of these and an old fashion RV type of plug
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Old 08-20-2014, 11:21 AM   #18
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Please correct me if I'm wrong but even a smart splitter 2-30A to 125/250 50 A on the boat will still give 220V to appliances...you just have reduced capacity and as long as you have sufficient voltage split.
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Old 08-20-2014, 11:32 AM   #19
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X2 on the 15A. When there is nothing else.
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Old 08-20-2014, 11:46 AM   #20
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Bay Pelican,
You pretty much confirmed my thoughts on what I need. I did not have the extra 30 amp cord included (thanks to twistedtree too on that one) , the rest are already on the list.
Some power is better than none, especially when others may object to a running genset at the dock.
Thank you to all the contributors to this thread.
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