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25-07-2010, 07:35
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#1
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Registered User
Join Date: Jun 2008
Location: Living & cruising east coast US and Carribean
Boat: Lagoon 380 "Winds Aloft"
Posts: 12
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Switching Single Generator and Two Shore Power Inputs
I want to switch my 8.5 kw 120V genset onto two separate AC shore power busses. I can't find any generator transfer switches made to accomodate this, but it seems many yachts do have such a system. What transfer switch are they using? Ideas, anyone?
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25-07-2010, 08:58
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#2
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Registered User
Join Date: Jun 2008
Posts: 316
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I have Krauss & Naimer switches. Kraus and Naimer products
If you're in the US, I suggest you call the people at Custom Marine Services in SC ( cmsquick.com). I have bought switches from them and they were very helpful. I think I have also seen the K&N switches rebranded (Blue Seas)?
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25-07-2010, 12:31
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#3
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Commercial Member
Join Date: Dec 2008
Location: St. Petersburg, FL
Boat: Gulfstar Long Range Trawler; 53'; BearBoat
Posts: 1,524
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To make sure I am clear, do you want to supply both 120 VAC panel busses with the output of your generator? Shore power will not be involved when in this configuration, correct?
Charlie
__________________
Charlie Johnson
ABYC Master Technician
JTB Marine Corporation
"The Devil is in the details and so is salvation."
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26-07-2010, 06:57
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#4
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Registered User
Join Date: Jun 2008
Location: Living & cruising east coast US and Carribean
Boat: Lagoon 380 "Winds Aloft"
Posts: 12
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That is absolutely correct, Charlie J!
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26-07-2010, 07:13
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#5
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Commercial Member
Join Date: Dec 2008
Location: St. Petersburg, FL
Boat: Gulfstar Long Range Trawler; 53'; BearBoat
Posts: 1,524
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winds aloft-
Often times gated double pole circuit breakers are a better option for selecting different sources. See, for example, Blue Sea Systems offerings at: AC 3 Sources - Horizontal - PN 8498 - Blue Sea Systems
CharlieJ
__________________
Charlie Johnson
ABYC Master Technician
JTB Marine Corporation
"The Devil is in the details and so is salvation."
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26-07-2010, 09:16
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#6
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,086
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Quote:
Originally Posted by CharlieJ
winds aloft-
Often times gated [sic: Lockout Slide] double pole circuit breakers are a better option for selecting different sources...
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Exactly!
Lockout slides are separately available.
4130/4131 ➥ http://bluesea.com/category/8/33/productline/233
__________________
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?"
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28-07-2010, 04:41
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#7
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Registered User
Join Date: Jun 2008
Location: Living & cruising east coast US and Carribean
Boat: Lagoon 380 "Winds Aloft"
Posts: 12
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That's what I'm currently using. However when I add the second shore power, I'm wondering what's the best way to get a single generator to power both busses ( and disconnect from the two separate shore power lines)
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19-08-2010, 15:36
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#8
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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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Use a 4-pole transfer switch. The incoming (2) shorepower utilize one position, the generator the other. Shorepower one connects to #1/#2 and shorepower 2 connects to #3/#4. On the generator position, strap #1 to #3 and #2 to #4, connect the generator to #1 & #2. The boat busses are #1/#2 and #3/#4.
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20-08-2010, 06:47
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#9
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Registered User
Join Date: Jun 2008
Location: Living & cruising east coast US and Carribean
Boat: Lagoon 380 "Winds Aloft"
Posts: 12
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FWIW- I ended up using a system of breakers for switching similiar to the setup pictured above by Gordmay, the difference being that I used the leftmost column of my distribution panel vs. horizontally. It works perfectly and is idiot-proof as well with the lockouts...
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