Westerbeke 9.0 BCG Technical Manual page 21

Air Requirements (Minimum Values)
Engine
Generator
BCG4.0KW 18 cu.ft./min. 225 cu.ft./min.
BCGS.5KW 32 cu.ft./min.
250 cu.ft./min.
BTG9.0KW 32 cu.ft./min. 250 cu.ft./min.
NOTE: Increase air supply 15% for 50-hertz operation (1500 rpm).
In confined compartments, fresh cool air
~
be brought into the generator compartment by means of an
AC or DC blower along with the necessary ducting. This air should be directed at the generator end's bell
opening and lower areas of the generator. unwanted hot air
~
be vented from the compartment, again,
with the use of AC or DC exhaust blowers. Keep in mind that hot air rises so it is logical that exhaust duct-
ing for the removal of hot air should be located in the upper areas of the compartment.
Sizing
A generator of sufficient output to maintain the average vessel load should be installed to avoid compromises
when electrical loading will have to be worked out. Make an inventory of the vessel's AC loads, paying par-
ticular attention to motor loads that the generator will have to start and run. (The amperage draw of a motor
when starting can be as much as 3 - 5 times its normal running amperage.) Determine the average AC load
of the vessel and size the generator to handle this load with a 10% reserve.
.MOOm
~
Amps
BCG4.0KW
(60 hertz) 120/240 34/17
(50 hertz) 3.0 KW 220 14
BCG6.5KW
(SO hertz) 120/240 54/27
(50 hertz) 4.8 KW 220 21.8
BTG9.0KW
(60 hertz) 120/240 75/37.5
(50 hertz) 7.0 KW 220 29
NOTE: 50 hertz units have a reduced KW rating and amperage output
15
Westerbeke Generators