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27-02-2018, 08:00
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#1
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Registered User
Join Date: Sep 2012
Location: San Francisco, CA
Boat: Beneteau 461 46'
Posts: 29
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220v to 110v
I know there’s a lot of posts on this topic but couldn’t find one answering my specific question.
We have a 220v European boat and cruising in the Caribbean. Is it dangerous to replace the male head on the shore power chord with 125v/30a plug so that it works in the marinas?
I know this isn’t the correct way to do it but is it actually dangerous?
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27-02-2018, 08:59
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#2
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Registered User
Join Date: Jan 2015
Location: SoCal
Boat: Formosa 30 ketch
Posts: 1,021
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Re: 220v to 110v
Are you trying to run 220v equipment on 110v? Your laptop charger might work, but your aircon and fridge sure won't.
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27-02-2018, 10:34
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#3
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Registered User
Join Date: Sep 2012
Location: San Francisco, CA
Boat: Beneteau 461 46'
Posts: 29
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Re: 220v to 110v
I’m guessing the fridge is 220v.
So the appliance just won’t run? It’s not going to fry anything or break the appliances?
Thanks for the response!
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27-02-2018, 10:54
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#4
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Registered User
Join Date: Apr 2007
Location: Marina del Rey, California
Boat: President 43 Sportfish
Posts: 4,105
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Re: 220v to 110v
You cannot simply replace the shore power cord plug to convert your boat from 50-cycle 220-volt European.
__________________
1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
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27-02-2018, 11:00
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#5
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Registered User
Join Date: Jun 2007
Location: SW Florida
Boat: FP Belize, 43' - Dot Dun
Posts: 3,823
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Re: 220v to 110v
Quote:
Originally Posted by Bumberg
I’m guessing the fridge is 220v.
So the appliance just won’t run? It’s not going to fry anything or break the appliances?
Thanks for the response!
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Hmm, I would guess the fridge is 12v. If it's 220v, that means they have an inverter.
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27-02-2018, 13:14
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#7
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Registered User
Join Date: Jul 2013
Location: home town Wellington, NZ and Savusavu Fiji
Boat: Reinke S10 & Raven 26
Posts: 1,491
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Re: 220v to 110v
A 220V appliance plugged in to 120V may work but the power drawn will be about a quarter of the required current. The lights will be very dim and motors will stall or turn very slowly. If they stall it may up the current some but in general it won't work well, if it works at all. Cooking equipment with heater elements will take forever and may not come up to temperature. Electronics with single inputs will probably not be seriously damaged but won't work. It's really not the smartest approach, and perhaps dangerous.
Doing it the other way, ie plugging 110V appliances in to 240V current will cause frying.
__________________
Grant Mc
The cure for everything is salt water: sweat, tears or the sea. Yeah right, I wish.
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27-02-2018, 14:07
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#8
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Registered User
Join Date: Jan 2011
Location: France/UK
Boat: Gib'Sea 402
Posts: 552
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Re: 220v to 110v
I have to say I initially thought the OP was going to bring in 110v by changing the connector, then use a transformer up to the 220v his stuff on board needs. To try and run 220v equipment off 110v is bizarre
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27-02-2018, 14:42
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#9
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Registered User
Join Date: Jan 2008
Location: SF Bay Area (Boat Sold)
Boat: Former owner of a Valiant V40
Posts: 1,226
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Re: 220v to 110v
In addition, European 220v is 50 Hz, not 60 as in the US. Anything on the boat with a 220v motor may not run on 60Hz even if transformed to 220v.
In my opinion, "easiest" (not necessarily cheapest) way to make a boat insensitive to shore power 110/220v 50/60Hz is to make the entire boat 12v and to use a battery charger that can handle any input power you have available.
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27-02-2018, 15:49
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#10
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Registered User
Join Date: Oct 2014
Location: Bay of Fundy,Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 3,650
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Re: 220v to 110v
Quote:
Originally Posted by jamhass
In addition, European 220v is 50 Hz, not 60 as in the US. Anything on the boat with a 220v motor may not run on 60Hz even if transformed to 220v.
In my opinion, "easiest" (not necessarily cheapest) way to make a boat insensitive to shore power 110/220v 50/60Hz is to make the entire boat 12v and to use a battery charger that can handle any input power you have available.
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Yes! and one of these may prevent having to change your 240v/50HZ fridge,etc. to 12V. However,it is limited to approx 2000W (2KW) & may not run all of your EU 240V appliances at the same time.
You may still have to convert some of your loads to 12V as jamhass explained
I found this model by Google & have had no experience with them-just an FYI
2 kVA 110V/220V 60Hz/50Hz Frequency Converter | GoHz.com
Len
__________________
 My personal experience & humble opinions-feel free to ignore both
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27-02-2018, 15:58
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#11
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Registered User
Join Date: Oct 2014
Location: Bay of Fundy,Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 3,650
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Re: 220v to 110v
__________________
 My personal experience & humble opinions-feel free to ignore both
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27-02-2018, 16:14
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#12
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Marine Service Provider
Join Date: Nov 2010
Posts: 911
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Re: 220v to 110v
It's all about the appliances... generally anything with a power adapter / supply will work, down-lights, chargers, laptops, ipad/iphones, TV's etc. Fridge, freezer and other heavy duty items are likely off the cards. A step-down converter as discussed would be the best and safest idea.
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28-02-2018, 14:55
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#13
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Registered User
Join Date: Feb 2015
Posts: 1,258
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Re: 220v to 110v
You may very well break things. The only way to know is to do a detailed analysis of your power system, and all that is connected to it to see which devices can/ cannot be run on 120V 60hz vs 230V 50hz. You may get lucky and find that with a few things turned off you can operate the basics on your boat. But just plugging in could be an expensive experiment/mistake.
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28-02-2018, 15:37
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#14
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Registered User
Join Date: Sep 2012
Posts: 5,986
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Re: 220v to 110v
First of all there is really no need to change anything. We also have 220 v systems and have never been in a marina that couldn't accommodate us.
We carry a transformer that changes the 220 to 120 if I want to use any of my power tools but otherwise we never have a need.
If you are planning to cruise the world so to speak you are way better off with 220v as other than North America the rest of the world uses 220 volts....it is superior to 120v.
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28-02-2018, 16:02
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#15
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Registered User
Join Date: Jul 2015
Location: Boston
Boat: Contessa 28
Posts: 18
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Re: 220v to 110v
All the 220V appliances will work with a single phase transformer that converts the voltage from 110 to 220V. The transformer size depends on the size of the boat equipment. A typical 40 footer will have 2-3KW air conditioner and 1KW fridge. So a 3KW single phase transformer will get the job done . There is always the frequency issue and North America uses 60HZ. Most of 220V motor appliances will try to run 20% faster due to frequency. And that may overheat the electrical motors that are close to their ratings. But in real world nothing happens. The motors are oversized anyway from the manufacturer.
The blender noise will be different (hi pitch noise). But the margarita drinks will still be DELICIOSO.
Just for the sake of argument a VCR (if you still have those tapes  ) will spin faster  . Just kidding it does not work on 60HZ.
I have converted the other way the 220 to 110 and had no problems whatsoever. The refrigerator cooling slowed down a bit.....
Cheers..
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