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Old 03-25-2013, 08:19 PM   #21
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I'll add myself to the list of head scratchers why someone would spend a bunch of money converting a boat with 50 amp service to two 30's. Pay a lot more to get less? If it is because 30 is what is available at the dock, but a Smart Y from Charles, Hubble or Marinco and be done with it.
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Old 03-25-2013, 08:20 PM   #22
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Ron, one advantage for you about Genuinedealz, whom I have had great experience with, if that they are right down the road from you in Brunswick GA.
Yes, shipping takes almost no time. If they were any closer I would have to pay sales tax!
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Old 03-26-2013, 07:13 AM   #23
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50A of 240 has 50A on each leg.

A "Y" combiner put into 2 30A outlets will be limited to 30 per leg.

This MIGHT be worth the effort IF the boat actually has a 240V item that requires power.

On most boats the 240V is used as 2 legs of 120V so 2 power hoses will allow two legs of 30A to be brought aboard , regardless of how the dock is wired.

Some docks do not have 240, just 120V .
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Old 03-26-2013, 07:39 AM   #24
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50A of 240 has 50A on each leg.

A "Y" combiner put into 2 30A outlets will be limited to 30 per leg.

This MIGHT be worth the effort IF the boat actually has a 240V item that requires power.

On most boats the 240V is used as 2 legs of 120V so 2 power hoses will allow two legs of 30A to be brought aboard , regardless of how the dock is wired.

Some docks do not have 240, just 120V .
Im not seeing that FF...each leg supplies a different 50 amp panel....with jumpers to a 3rd 250V panel if needed.

So please explain why it's not 100 amps versus only 60 with 2-30's?
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Old 03-26-2013, 09:04 AM   #25
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I am redoing the AC-DC wires and panels on a 1981 Grand Banks 49' vessel. All AC and DC are red and black.
All of your DC conductors are red and black ?
Strongly suggest you get the ABYC colour coding chart.

All your AC wires are red & black ?
What about white and green ? You most definetly need a colour code chart. If you are correct this is a potentially serious issue.
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Old 03-26-2013, 09:40 AM   #26
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Im not seeing that FF...each leg supplies a different 50 amp panel....with jumpers to a 3rd 250V panel if needed.

So please explain why it's not 100 amps versus only 60 with 2-30's?
What appliances do you have on your boat that need 100 amps of shore power? What do you use when anchored away from shore power?
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Old 03-26-2013, 10:27 AM   #27
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I've used Blue Sea System's Panel Wizard to design a couple of panels for a customer. It works really well and they provide you with an image of the panel as it will look before you place the order.
You can probably negociate a better price if you place the order through a dealer rather than direct from Blue Sea.
Here's a link to their Panel Wizard: Panel Wizard by Blue Sea Systems
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Old 03-26-2013, 05:29 PM   #28
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While the question was not addressed to me, I have two 50/240 shore power inlets and a 20 kw generator. I could have all three in use at the same time but never have. 6 air con units, though seldom are more than three are on at a time. An electric dryer, a full sized dishwasher, full size four burner electric range and full sized oven, 30 gallon water heater, a microwave, a Sub Zero side-by-side refrigerator, a wine cooler and a freestanding ice maker. Amongst other things.

There are three 240v sub panels on the boat which typically have a mix of 240 and 120 loads. At the home dock, we put the zircon panel, which has a few other items, on one of the two shore power cords, and the other two on another. Back when we were following the temperate weather around, we could use one 50 amp cord if we didn't have the oven, stove, dishwasher and laundry dryer going.
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Old 03-28-2013, 06:12 AM   #29
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So please explain why it's not 100 amps versus only 60 with 2-30's?

Wire size. The 240 50A a leg will usually have #6 wires to conduct

The 120V 30A will probably only have #10.

The dock 30A socket can ONLY supply 30A , even if the wiring to the boat was #4.

Visit any marina in the spring and see the burnt and blackened 30 power plugs after an owner tried to heat with electric.
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Old 03-28-2013, 07:17 AM   #30
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So please explain why it's not 100 amps versus only 60 with 2-30's?

Wire size. The 240 50A a leg will usually have #6 wires to conduct

The 120V 30A will probably only have #10.

The dock 30A socket can ONLY supply 30A , even if the wiring to the boat was #4.

Visit any marina in the spring and see the burnt and blackened 30 power plugs after an owner tried to heat with electric.
I know all that...but my question is still why wouldn't you GO 124/250 50 amp and use 50 amp where available . If where you only have 30 amp...you are no worse off than if you ony had 30 amp shore power to begin with?

Sure setting the boat up that way means you HOPE to usually find 50 amp dock service...but when you do have the 50 amp 125/250....you can set your boat up like a 100 amp house service and not worry as much about load shedding.

Again for casual cruisers no big deal but 24/7/365...leaving stuff plugged in and just turning it on without running to the control panel is nice...and not worrying abut guests who can't ever seem to get electrics.
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