Electrical system
38
Install the batteries in a tight-fitting box. Vent the box
with 25 mm (") hoses. The ventilation hose must end
up outside the boat to allow the detonating gas, pro-
duced by batteries, to escape.
The batteries should be fastened and only allowed to
move max 0 mm (3/8").
WARNING! The batteries, if they are not the
closed type, may only be installed in the engine
compartment if they are installed in a separate
sealed and well ventilated battery box. Battery
gas is easily ignited and highly volatile. Sparks
or open flames can cause explosion or fire.
Battery dimensioning
Cranking current
Cranking current for engines at +5°C (4°F).
12V system
D5/D7 ........................................... 650 A
D9 ................................................ 700 A
24V system
D5/D7 ........................................... 320 A
D9/D ........................................ 340 A
D2 .............................................. 500 A
D6 ............................................... 900 A
As a guideline the breakaway current can be calcu-
lated as 2–2.5 times cranking current.
Selecting battery size
When selecting battery size, it is vital to look at both
momentary and long-term capacity.
•
The rating norm for long-term capacity (batteries
marked with Ah) the C20 norm is used.
C20 means the amount of current able to take out
from the battery during 20 h.
Ex. : 60Ah = 20 h X 3A
Ex 2: 00Ah = 20 h X 5A
The battery sizes listed below are recommended for
Volvo Penta engines at a temperature down to +5°C.
Battery voltage is 2V.
Engine
V
Capacity,
Ah
min
max
D5/D7
2V
88
70
D5/D7
24V
2x66
2x 5
D9
2V
40
2x220
D9/D
24V
2x05
2x80
D2
24V
2x40
2x220
D6
24V
2x40
2x220
Battery installation
The battery capacity will decrease with approx.
% per degree, from +20°C, which has to be consid-
ered at extreme conditions in temperature
NOTE! The list above specifies batteries per engine.
E.g. for a twin D9, 24V a total of four 05Ah batteries
should be installed.
Summary of Contents for D11 series
Page 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
Page 2: ......
Page 208: ...206 References to Service Bulletins Group No Date Concerns ...
Page 209: ...207 Notes ...
Page 210: ...208 Notes ...
Page 212: ...7748655 English 11 2007 ...