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Old 11-27-2018, 02:25 PM   #1
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Electrical Hook Up

11/27/18

What type power out put at the dock is needed for a 1981 GB Classic with 3 separate HVAC Units, Hot Water Heater as well as lights etc.? Trying to determine is current service is satisfactory? Appears to be just 110 outlets with regular "house type" recepticles?
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Old 11-27-2018, 02:33 PM   #2
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Originally Posted by hwclark View Post
11/27/18

What type power out put at the dock is needed for a 1981 GB Classic with 3 separate HVAC Units, Hot Water Heater as well as lights etc.? Trying to determine is current service is satisfactory? Appears to be just 110 outlets with regular "house type" recepticles?
There are a few things that need to be thought about....
- your existing boat inlets will limit your choices
- a 1981 boat may have been altered over the years
- the type and size of AC unit will vary the draw
- 3 marine AC units may draw 35 amps or more
- your water heater and lights will likely draw 7 amps or so (a guess)

Do you have an amp gage on the boats genset? If so you can read the draw there and consider your options.

In no case will a simple 110 vlt outlet service your requested items.
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Old 11-27-2018, 03:12 PM   #3
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What kind of dock provides only a household type 15/20A outlet? Sounds like a private dock. No marina could exist with only that kind of service.

To run three ACs, a hot water heater, charger, fridge, lights, etc you will need at least two 30A shorepower supplies or one 240/120V 50A supply depending on how your boat is set up. You can use a Y adapter to convert a 240/120V 50A supply to two 120V 30A.

If it is a private dock then it will be a pretty big deal to run two phase 240/120V 50A service from the breaker panel down to the dock or two 120V 30A circuits and wire them to a pedestal/outlets.

David
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Old 11-27-2018, 03:21 PM   #4
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What kind of dock provides only a household type 15/20A outlet? Sounds like a private dock. No marina could exist with only that kind of service.

To run three ACs, a hot water heater, charger, fridge, lights, etc you will need at least two 30A shorepower supplies or one 240/120V 50A supply depending on how your boat is set up. You can use a Y adapter to convert a 240/120V 50A supply to two 120V 30A.

If it is a private dock then it will be a pretty big deal to run two phase 240/120V 50A service from the breaker panel down to the dock or two 120V 30A circuits and wire them to a pedestal/outlets.

David
"To run three ACs, a hot water heater, charger, fridge, lights, etc you will need at least two 30A shorepower supplies or"

I believe 2 - 30's will only work if the AC units are split between two lines. If all 3 are on one line 30 will not be sufficient.
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Old 11-27-2018, 05:24 PM   #5
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On my boat with only 2 AC units, the 16,000 btu draws 16.2 amps in heat mode and the 9000 btu unit draws 10.6 amps. That includes 1 blower each and one cooling water pump shared by both. Heat mode draws slightly more than cooling mode so heat is more limiting.
Your 3rd unit will have to be powered by the other 30A cord.
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