[Sentoa] sound shield for genset

Elliot Kocen edk1 at comcast.net
Thu Jun 7 11:31:07 EDT 2007

Bob & Jerry, Thanks for the info. We also wanted a genset to run our A/C.
However, our engine compartment has hardly any room left for me much less a
genset, as we have a 100 HP Yanmar along with 3 AGM batteries, chargers, hot
water and holding tank, etc. I would put the genset in the lazarette, if I
could figure out where I'm going to store all the other stuff that's already
there. As an interim solution, we're installing a new high efficiency
Italian Climma 12Kbtu A/C (supposedly equivalent to a 14K btu standard unit)
which has been tested to run off of batteries.  The unit is expected to draw
165 amp hours over 12 hours with a 3 hour run time.  We will confirm this
next week after the installation.  Our hope is that we can use the A/C
underway, while the 110 amp alternator attempts to keeps up with the draw
down, and cool the boat off prior to anchoring.  We have 530 amp hours in
the current battery bank.  If we need more, we'll add more batteries in the
lazarette.  While not cheap, it's less than a new gen set, we hope.  If
you're interested, I'll report back on the results.  Elliot Kocen,
Canvasback, NT 26-150, Solomons, MD


-----Original Message-----
From: sentoa-bounces at lists.samurai.com
[mailto:sentoa-bounces at lists.samurai.com] On Behalf Of Jerold Tabbott
Sent: Thursday, June 07, 2007 10:41 AM
To: South East Nordic Tugs Owners' Association (SENTOA)
Subject: Re: [Sentoa] sound shield for genset




As info, we put a 2500 KW NextGen in the engine compartment of our 26
(mounted on a platform, portside). There wasn't a sound shield/cabinet for
it when we purchased it, and we found we had major problems with heat. Once
the ambient temperature gets over a certain mark, the genset part of the
unit will shut down (diesel continues running). This could happen very
quickly, defeating the purpose of having a generator (for us, air


The problem we had on our 26 was ventilation. The original 26's were
designed with expectation of using smaller main engines (30-60 hp), so the
ventilation requirements were rather small. Ours has the old wooden louver
vents located aft of the pilothouse doors. We added a vent to the portside,
by the genset to allow more air. However, this was not enough. Subsequently,
we added a 120v blower to pull air from the engine compartment. This, too,
was insufficient to cool the genset. It wasn't until we closed off the
portside compartment from the main engine compartment that we finally got
better results. This allowed the blower to more effectively recirculate the
air just around the genset (instead of the whole engine compartment). So in
my opinion, aside from the sound proofing value, the much greater importance
of these genset jackets is to ensure it stays cool.


Improving our cooling/soundproofing arrangement is still on my to-do list.
The NextGen we purchased now sells with its own casing, and casings are
available. Unfortunately, trying to fit it around the genset after the fact
is not practical for us (would have to remove both genset and Yanmar first).


Jerold Tabbott

Lady Diane II (26-065)


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