Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-08-2008, 13:08   #1
Registered User
 
Agility's Avatar

Join Date: Sep 2006
Location: Colorado
Boat: Chris White A47 Mastfoil
Posts: 310
Images: 6
Yanmar 3KW Generator Power Box

I'm specking out a new Atlantic 57 Cat and we are currently using Volvo D55 Saildrives with very high output alternators (Mastervolt 24/150). I don't want the weight and maintenance of a genset.

I could get a similar amount of power output from a couple of Yanmar bolt-on generators and I think the design would be a simpler and more robust so I'm considering swapping the Volvo's for Yanmar's.

Anybody have any experience with the new Yanmar KMG65E?

All I could find was http://www.cruisersforum.com/forums/...tor-12355.html which argues in favor of the Yanmar conceptually.
__________________

__________________
Agility is offline   Reply With Quote
Old 16-08-2008, 15:13   #2
Registered User
 
Nordic cat's Avatar

Join Date: Jan 2008
Location: Denmark
Boat: FP Tobago 35
Posts: 721
I am going for them on my new 40 ft cat, using the 39 hp engines. You can go up to 6 kVA with an extra control box, weighing around 15 kgs.

You need to take care that only one engine at a time can supply AC power to the mains ring on the boat.

My decision is to also split my battery banks in 2, with 2 chargers, to get the shortest possible charge times.

A simple interlock relay will fix the problem.

The advantage is that these don't load up the bearings at the front of the engine like a high output DC alternator does.

I will just keep the standard alternators and let them charge the start batteries only, and make a manual DC crosslink between the engines if one of the start batteries dies on me.

cheers

Alan
__________________

__________________
Nordic cat is offline   Reply With Quote
Old 16-08-2008, 16:24   #3
Registered User
 
Agility's Avatar

Join Date: Sep 2006
Location: Colorado
Boat: Chris White A47 Mastfoil
Posts: 310
Images: 6
Quote:
Originally Posted by Nordic cat View Post
make a manual DC crosslink between the engines if one of the start batteries dies on me.
This made me smile. Sounds like jumper cables....
__________________
Agility is offline   Reply With Quote
Old 16-08-2008, 16:30   #4
Registered User
 
Agility's Avatar

Join Date: Sep 2006
Location: Colorado
Boat: Chris White A47 Mastfoil
Posts: 310
Images: 6
Quote:
Originally Posted by Nordic cat View Post
I am going for them on my new 40 ft cat, using the 39 hp engines. You can go up to 6 kVA with an extra control box, weighing around 15 kgs.

You need to take care that only one engine at a time can supply AC power to the mains ring on the boat.
Wow, somehow I missed that in the spec. So are you getting the generator unit on both engines or just one?

Tim
__________________
Agility is offline   Reply With Quote
Old 16-08-2008, 16:31   #5
Registered User
 
Nordic cat's Avatar

Join Date: Jan 2008
Location: Denmark
Boat: FP Tobago 35
Posts: 721
Well - that would save me a few bucks....

Any pictures of the new boat yet?

Cheers

Alan
__________________
Nordic cat is offline   Reply With Quote
Old 16-08-2008, 16:39   #6
Registered User
 
Nordic cat's Avatar

Join Date: Jan 2008
Location: Denmark
Boat: FP Tobago 35
Posts: 721
Quote:
Originally Posted by BlueRhapCity View Post
Wow, somehow I missed that in the spec. So are you getting the generator unit on both engines or just one?

Tim

Yes -don't want to unbalance the boat so both. This power source is important, so therefore will be a redundant setup.

I will also have around 600 -800 Watts of solar panels running through a smart controller.


Alan
__________________
Nordic cat is offline   Reply With Quote
Old 16-08-2008, 17:06   #7
Registered User

Join Date: Jun 2007
Location: Alvin, Tx
Boat: None yet
Posts: 9
What RPM does the motor have to turn? This may cause problems if you are motoring and need power but are not going fast enough to generate power. It may also get noisy if you have to turn 3600 RPMs to generate power

Ron
__________________
priusron is offline   Reply With Quote
Old 16-08-2008, 17:43   #8
Registered User

Join Date: May 2008
Location: Belo Horizonte, Brazil
Boat: Farr 46
Posts: 124
from the Yanmar brochure for one power box, approx

1000rpm - 900 watts
1500rpm - 1800 watts
2200rpm - 3000 watts
I initially thought this sounded like a good idea but when I saw these numbers changed my mind. Better to go for a big alternator/inverter combination IMHO
__________________
Marinheiro is offline   Reply With Quote
Old 16-08-2008, 18:41   #9
Registered User
 
Agility's Avatar

Join Date: Sep 2006
Location: Colorado
Boat: Chris White A47 Mastfoil
Posts: 310
Images: 6
Quote:
Originally Posted by Marinheiro View Post
from the Yanmar brochure for one power box, approx

1000rpm - 900 watts
1500rpm - 1800 watts
2200rpm - 3000 watts
I initially thought this sounded like a good idea but when I saw these numbers changed my mind. Better to go for a big alternator/inverter combination IMHO

Hum, seems lie a roughly similar power curve - see attached.
Attached Files
File Type: pdf ChargingCurrentAlt.pdf (47.2 KB, 222 views)
__________________
Agility is offline   Reply With Quote
Old 16-08-2008, 18:52   #10
Registered User

Join Date: May 2008
Location: Belo Horizonte, Brazil
Boat: Farr 46
Posts: 124
But remember the Mastervolt curves are alternator speed, so you can play around with pulley ratios to maximise alternator output, ensuring you do not exceed the alternator's max speed at max engine speed
__________________
Marinheiro is offline   Reply With Quote
Old 17-08-2008, 09:48   #11
Registered User
 
Agility's Avatar

Join Date: Sep 2006
Location: Colorado
Boat: Chris White A47 Mastfoil
Posts: 310
Images: 6
Quote:
Originally Posted by Nordic cat View Post
Well - that would save me a few bucks....

Any pictures of the new boat yet?

Cheers

Alan
Still too early for my boat, but here's one from the first hull out of Alwoplast.


__________________
Agility is offline   Reply With Quote
Old 17-08-2008, 14:13   #12
Registered User
 
Nordic cat's Avatar

Join Date: Jan 2008
Location: Denmark
Boat: FP Tobago 35
Posts: 721
Looks great!

When is yours due?

Alan
__________________
Nordic cat is offline   Reply With Quote
Old 18-08-2008, 08:03   #13
Registered User
 
Agility's Avatar

Join Date: Sep 2006
Location: Colorado
Boat: Chris White A47 Mastfoil
Posts: 310
Images: 6
Quote:
Originally Posted by Nordic cat View Post
Looks great!

When is yours due?

Alan
Christmas 2010
__________________

__________________
Agility is offline   Reply With Quote
Reply

Tags
generator, yanmar

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
Power-on-Demand Generator beau Electrical: Batteries, Generators & Solar 16 21-07-2010 04:35
Generator and Power Surge Protector Won’t Play Together Dream Maker Electrical: Batteries, Generators & Solar 3 10-07-2008 11:46
How much electric power is needed to power a 40 - 45' cat at 5 knots? KHK007 Multihull Sailboats 40 18-03-2008 07:16
Yanmar - Bolted on Engine Generator? David_Old_Jersey Engines and Propulsion Systems 5 22-01-2008 05:55
Stuffing box or re-stuffing the box / dripless Dave in Eugene General Sailing Forum 10 28-12-2007 16:45



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:29.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.