Join the C34 Association Today!
[C34 Home] [C34Tech Notes] [C34 Tech Wiki] [Join!]
Please login or register.
Advanced search  

News:

Pages: [1] 2   Go Down

Author Topic: Isolation Transformer  (Read 1119 times)

0 Members and 1 Guest are viewing this topic.

MarcZ

  • Forum - Petty Officer 3rd Class
  • ***
  • Karma: 1
  • Posts: 75
    • View Profile
Isolation Transformer
« on: April 07, 2017, 09:40:17 AM »

I'm contemplating adding Isolation Transformer while upgrading to Smart-plug , and looking for advice / suggestions on location , brand etc. (pic would be great)

I found one from  Charles Marine Iso-G2 3.6 kVA  size ~ 10" x 10" x 10"

Thanks,
Marc

Logged
93 C34 Mk 1.5 #1258 TR WK M35
Upper Chesapeake

mark_53

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 352
    • View Profile
Re: Isolation Transformer
« Reply #1 on: April 07, 2017, 09:57:05 AM »

Marc: 
I have an isolation transformer that is located on a lower shelf in the port side wet locker. I believe it's a Charles. Seems to work fine. I've been using it for about 3 years. Came with the boat.
« Last Edit: April 08, 2017, 09:52:43 AM by mark_53 »
Logged
1989 C34 Mk1 M25XP

The Green New Deal is coming...just keept the government out of the way!

MarcZ

  • Forum - Petty Officer 3rd Class
  • ***
  • Karma: 1
  • Posts: 75
    • View Profile
Re: Isolation Transformer
« Reply #2 on: April 07, 2017, 11:21:11 AM »

Does it get hot ? how about noise level  ?

Thank you,
Marc
Logged
93 C34 Mk 1.5 #1258 TR WK M35
Upper Chesapeake

mark_53

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 352
    • View Profile
Re: Isolation Transformer
« Reply #3 on: April 07, 2017, 12:31:23 PM »

It doesn't get hot.  Noise is a slight hum but not disturbing at all.
Logged
1989 C34 Mk1 M25XP

The Green New Deal is coming...just keept the government out of the way!

J_Sail

  • Forum - Petty Officer 2nd Class
  • ****
  • Karma: 4
  • Posts: 138
    • View Profile
Re: Isolation Transformer
« Reply #4 on: April 07, 2017, 11:04:19 PM »

Not to distract from an excellent question, but have you considered the cheaper alternative of a galvanic isolator? I don't have personal experience, but galvanic isolators have greatly improved over the years, with new "fail-safe" models leading the way, and are cheaper/smaller/lighter than transformers and are silent. The Iso G-2 weighs 60 lbs, while a 30A galvanic isolator weighs under 3 lbs (and is about 1/4 the size).

I have heard from two reliable/expert sources that the DEI fail-safe galvanic isolators are of superb quality.

That said, a galvanic isolator does not protect against quite as many scenarios as an isolation transformer, so there are good reasons to go either way.

Jeremy
Logged

MarcZ

  • Forum - Petty Officer 3rd Class
  • ***
  • Karma: 1
  • Posts: 75
    • View Profile
Re: Isolation Transformer
« Reply #5 on: April 12, 2017, 12:58:51 PM »


I did look at both, with transformer there is simply no "technical" or "functionality" downside "just"  1) price  :shock:  2)  size 3) weight  - last two are definitely manageable .

More I think about location more I'm eyeing cockpit locker, it would be right next to my shore power plug and fairly out of the way . Am I missing something here ?  :think
Logged
93 C34 Mk 1.5 #1258 TR WK M35
Upper Chesapeake

mark_53

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 352
    • View Profile
Re: Isolation Transformer
« Reply #6 on: April 12, 2017, 10:13:00 PM »

My cockpit locker gets more exposure to the elements and wet stuff then inside the cabin.  I think you want to keep expensive electronics as protected as possible.
Logged
1989 C34 Mk1 M25XP

The Green New Deal is coming...just keept the government out of the way!

Ken Juul

  • Forum - Master Chief Petty Officer of the Navy
  • ********
  • Karma: 14
  • Posts: 2276
    • View Profile
Re: Isolation Transformer
« Reply #7 on: April 13, 2017, 07:28:21 AM »

I mounted my galvanic isolator inside the cockpit combing next to the engine instrument panel.  Easy access to the shore power plug and out of the elements.
Logged
Ken & Vicki Juul
Luna Loca #1090
Chesapeake Bay
Past Commodore C34IA

Noah

  • Administrator
  • Forum - Master Chief Petty Officer
  • *******
  • Karma: 19
  • Posts: 1556
    • View Profile
Re: Isolation Transformer
« Reply #8 on: April 13, 2017, 09:51:52 AM »

Does anyone know what year/hull number when they moved the shorepower plug from the outside of the combing to inside the cockpit?
Logged
1990 hull #1014, San Diego, CA,  Fin Keel,
Standard Rig

Dave Spencer

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 405
    • View Profile
Re: Isolation Transformer
« Reply #9 on: April 13, 2017, 10:18:09 AM »

Mine's on the stbd transom.  Mk1.5 with sugar scoop stern.  1994 model built late 1993.  It's out of the way but readily accessible.  I haven't yet left the dock with the power cable attached!   :shock:
Logged
Dave Spencer
C34 #1279  "Good Idea"
Mk 1.5, Std Rig, Wing Keel, M35A Engine
Boat - Lion's Head, Ontario
People - London, Ontario

MarcZ

  • Forum - Petty Officer 3rd Class
  • ***
  • Karma: 1
  • Posts: 75
    • View Profile
Re: Isolation Transformer
« Reply #10 on: April 13, 2017, 10:47:05 AM »

Do you have a transformer there as well ?

So far we have 3 production years and 3 different plug locations  :?

There is definitely something about cockpit locker being not very dry therefore not ideal for electrical anything but ..... I already have "electrical box" right there and no signs of trouble

I need to make a dummy template and start measuring alternative locations
Logged
93 C34 Mk 1.5 #1258 TR WK M35
Upper Chesapeake

Dave Spencer

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 405
    • View Profile
Re: Isolation Transformer
« Reply #11 on: April 13, 2017, 11:53:43 AM »

No transformer on my boat.
Logged
Dave Spencer
C34 #1279  "Good Idea"
Mk 1.5, Std Rig, Wing Keel, M35A Engine
Boat - Lion's Head, Ontario
People - London, Ontario

mark_53

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 2
  • Posts: 352
    • View Profile
Re: Isolation Transformer
« Reply #12 on: April 13, 2017, 12:24:13 PM »

I think about location more I'm eyeing cockpit locker, it would be right next to my shore power plug and fairly out of the way . Am I missing something here ?  :think

Is there a reason being close to the power plug is important?  Mounting close to the AC bus would be just as convenient to install on my MK1.  Don't know about the MK2.
Logged
1989 C34 Mk1 M25XP

The Green New Deal is coming...just keept the government out of the way!

rmbrown

  • Forum - Petty Officer 1st Class
  • *****
  • Karma: 1
  • Posts: 352
    • View Profile
Re: Isolation Transformer
« Reply #13 on: April 13, 2017, 12:30:09 PM »

Re plug location, I have hull number 1251, a 93 model built in December of 92, and mine is in the cockpit, not in on the stern.  I see Dave's is a year later and on the transom.  Not sure if that helps bracket when they moved it, or proves that the location isn't consistent!
Logged
Mike Brown
1993 C34 Tall Rig Wing Keel Mk 1.5
CTYP1251L293
Just Limin'
Universal M-35AC

sailaway

  • Forum - Petty Officer 2nd Class
  • ****
  • Karma: 2
  • Posts: 178
    • View Profile
Re: Isolation Transformer
« Reply #14 on: April 14, 2017, 03:52:19 AM »

The whole problem with galvanic action is the green wire from the shore power cord being connected to your engine. A power isolation transformer on the power lines doesn't do much good. Any transformer that is loaded or working will give off heat. Charlie
Logged
Pages: [1] 2   Go Up