Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 10-01-2012, 16:50   #1
Registered User

Join Date: Jan 2012
Posts: 1

lagoon 38. what is the best way to convert power from 220v50hz to 120v 60hz ,thanks howard

howard1 is offline   Reply With Quote
Old 10-01-2012, 18:48   #2
Senior Cruiser
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,052
Images: 12
Re: conversion

Welcome Howard,

Lagoon has an active owners group on yahoo groups and probably some of them have had to do this conversion. In general, you will need to make sure your wiring and breakers are correctly sized, since they will be carrying twice the amperage at 120V, and you will need to replace any appliances, electrics, fixtures, etc that run solely on 220V 50Hz.



You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 11-01-2012, 05:02   #3
Moderator Emeritus
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 32,221
Images: 240
Re: conversion

Greetings and welcome aboard the CF, Howard.
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

GordMay is offline   Reply With Quote
Old 11-01-2012, 06:42   #4
Registered User

Join Date: Jun 2007
Location: SW Florida
Boat: FP Belize, 43' - Dot Dun
Posts: 3,732
Re: conversion

I went thru this on my boat, which was a mix of 220/50 & 120/60.

What I found -
- the distribution wiring was all 2.5mm2 which is slightly larger than 14awg
- the breakers were either 10amp or 16amp
- the hot water heater element was already a 120v 750w unit (they were running it at 220v)
- AC was installed in NA, so it was already 120v 60hz (although will run at lesser capacity on 120v/50hz via an auto transformer)

Since the wire size more than supports the breaker size, I changed the receps and the shore power cord and used all the existing breakers and wiring. My boat already had Berker Integro (Germany) receps (& matching 12v light switches), so I went to the trouble to get the North American receps from Berker in order to maintain the look and use the same cover plate & box. I like the look, but it was a pain and $$$ to get them. I also replaced the 220/50 inverter with a 120/60. The shore power charger accepts either.

If you read the technical data you'll find the claim that ELCIs built for 50hz shouldn't be used for 60hz. My investigation found that when using the 'wrong' ELCI, it will trip at a different unbalance value. I did the simple math and figured that if the ELCI trips at +/- 20%, I don't care, it'll still trip on a fault (somewhere between 24ma to 36ma). If you want exactly 30ma trip, you should probably replace the ELCI(s) that are built for 50hz. I don't have any GFCIs on my boat (5ma trip).

Now my boat is all 120v/60hz & NA receps. I've since added a 6250va isolation transformer, fed with 240v/60hz using the secondary as 120v/60hz. The shore power is 240v/50a with a 30a ELCI on the input to the IT & 50a breaker on the output. I also wired my genset to the input of the IT via a transfer switch. This allows the IT to clean up some of the harmonics in the genset output.


Good Luck!
DotDun is online now   Reply With Quote

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wheel Conversion for a Tradewind 33 Martkimwat Construction, Maintenance & Refit 10 21-02-2017 10:13
Icebox Conversion Question offgrid64 Plumbing Systems and Fixtures 6 14-03-2014 23:14
Wheel to Tiller Conversion on Luders 33 malbert73 Construction, Maintenance & Refit 6 21-01-2012 20:09
Twin Engine Conversion for Pre-1994 Gemini Epiphany Multihull Sailboats 10 10-07-2011 11:17
Electrolytic conversion detection sandycohen Construction, Maintenance & Refit 2 29-06-2011 18:29

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:32.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.